2 Homometallic Alkoxides

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X-Ray Crystal Structures of Alkoxo Metal Compounds 299 The interesting carbido methylimido isopropoxo complex [W4⊲ 4-C⊳⊲ -OPr i ⊳4⊲ - NMe⊳⊲OPr i ⊳8] hasa“butterfly” W4 core of atoms with the 4-carbide atom closer to the wingtip tungstens (W–C, 1.914 ˚A, 1.956 ˚A) than to the backbone tungstens (W–C, 2.241 ˚A, 2.251 ˚A). The backbone W atoms are octahedrally coordinated whereas the wingtip tungstens are five-coordinated. 373 Yet another W4 configuration is found in the carbonyl complex [W4⊲ 4, 2 -CO⊳⊲ - OBu i ⊳5⊲OBu i ⊳7⊲CO⊳2] (Fig. 4.52). In this spiked-triangular arrangement three of the W atoms are octahedrally coordinated and the fourth is in a pseudo-square pyramidal configuration. The two terminal carbonyls are bonded to one tungsten in the cis configuration. 374 Another W4 chain structure with alternating short (2.721 ˚A) and long (3.504 ˚A) W–W distances is found in [W4⊲ -CEt⊳2⊲ -C2Me2⊳⊲ -OPr i ⊳2⊲OPr i ⊳4⊲ 2 - C2Me2⊳2] which contains both bridging and chelating alkyne ligands. The two halves of this symmetrical molecule are held together by weak isopropoxo bridges. 351 Another tetranuclear “butterfly” configuration is found in [W4⊲ 4-C⊳⊲ -NMe⊳⊲ - OCH2Bu t ⊳4⊲OCH2Bu t ⊳7⊲H⊳] in which the hydride is terminally bonded to one of the backbone tungsten atoms. 375 A most remarkable structure is exhibited by the hydrido complex [W4⊲ -H⊳4⊲ - OPr i ⊳⊲ -dmpm⊳3⊲OPr i ⊳7] or [⊲Pr i O⊳3W⊲ -H⊳⊲ -OPr i ⊳W⊲ -dmpm⊳3⊲ -H⊳W⊲ - H⊳2W⊲OPr i ⊳4] in which each W atom has a different coordination. The outer W atoms are metal–metal bonded (W–W, 2.451, 2.499 ˚A) to their neighbours but the inner two metals, which are linked by three bridging dmpm ligands and one hydride, are not metal–metal bonded. 363 One hexanuclear structure [W6⊲ -H⊳4⊲ -OPr i ⊳7⊲ -CPr i ⊳⊲OPr i ⊳5⊲H⊳] has been reported. 363 This is based on the familiar octahedral W6 cluster configuration with 12 bridging (4 hydride, 7 isopropoxide, 1 alkylidyne) ligands and 6 terminal (5 isopropoxide, 1 hydride) ligands. Finally it is noteworthy that extended-chain metal–alkylidyne polymers [Wf -C⊲4⊳C6H2N-3,5-Me2g⊲OBu t ⊳3]n and [Wf -C⊲3⊳C6H4Ng⊲OBu t ⊳3]n have been structurally characterized. In the 4-alkynyl-3,5-dimethylpyridyl complex the tungstens are in the square pyramidal five-coordination but in the 3-alkynylpyridyl complex the tungstens adopt the TBP configuration. 376 Figure 4.52 W4⊲ 4-CO⊳⊲ -O⊳5O7⊲CO⊳2 core structure of [W4⊲ 2 , 4-CO⊳⊲ - OR⊳5⊲OR⊳7⊲CO⊳2] (R D CH2Pr i ; ž D C of CO; D O; R groups omitted).
300 Table 4.11 <strong>Alkoxides</strong> of chromium, molybdenum, and tungsten Metal M–O Bond lengths ( ˚A) Bond angles ( Ž ) Compound coordination Terminal Bridging MOC � Reference [Cr⊲OCHBu t 2⊳4] [Cr⊲OCMe2CH2OMe⊳3] 4 6 1.771, 1.774 (3) 1.892, 1.923, 1.931 (2) (alkoxo) 2.051, 2.060, 2.096 (2) (ether) – – 140.5, 141.1 – 211 212 [Cr2⊲ -OCHBu t ⊳2⊲OCBu t 3⊳2] 3 1.838 (3) 1.964, 1.986 (4) 171.0, 174.9 (t) 133.1 (b) 213 [⊲C5H5⊳2Cr2⊲ -OBu t ⊳2] 31 – 1.91–1.98 (1) 129–139 214 av. 1.96 av. 133 [Mo⊲OSiMe3⊳4⊲Me2NH⊳2] [Mo⊲OBu 6 1.950, 1.951 (4) – 170.8, 174.2 215 t ⊳2⊲CO⊳2⊲py⊳2] [Mo(1-ado) 4⊲Me2NH⊳] 1-ado D 1-adamantolato 6 5 1.94, 1.95 (1) 1.963 (2) (ax) 1.888, 1897, – – 140, 141 140.3 (ax) 136.8, 137.8, 216 217 1.916 (2) (eq) 141.7 (eq) [Mo⊲OBu t ⊳4⊲NNCPh2⊳] 5 1.944 (3) (ax) – 141.4 (ax) 305 1.889 (3) (eq. av.) 137.5 (eq, av.) [Mo⊲OPr i ⊳2⊲NO⊳⊲Me2pz⊳] Me2pz D 3,5-dimethylpyrazolylato 6 1.900, 1.908 (4) – 133.4 218 [Mo(OEt)⊲OPr i ⊳⊲NO⊳⊲Me2pz⊳] 6 1.900, 1.901 (4) – 129.5, 129.8 218 [Mo⊲OPr i ⊳2⊲NO⊳fHB(impz) 3g] HB(impz) 3 D isopropylmethylpyrazol-1-yl [Mo⊲ -N⊳⊲OBu 6 1.88 (1) – 130.5 219 t ⊳3]1 [Mo⊲ -N⊳⊲OPr 5 1.882 (4) – 135.1 220 i ⊳3]1 [Mo4⊲ -N⊳4⊲OBu 5 1.894 (17) – 128.6 220 t ⊳4Me8⊲NC5H4But⊳2] [Mo⊲OC2H4O⊳3] 5 and 6 6 1.882 (2) 1.890–1.918 (5) av. 1.903 – – – 116.0–119.3 av. 118.4 221 222 [Mo⊲OCMe2CMe2O⊳3] 6 1.902–1.911 (5) – 118.7–120.5 222 av. 1.907 av. 119.8 [Mo2⊲OCH2But⊳6] 411.855–1.905 (6) – 114.5, 134.2, 223 av. 1.876 134.2
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Alkoxo and Aryloxo Derivatives of M
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1 Introduction In 1978 the book ent
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1 INTRODUCTION 2 Homometallic Alkox
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Homometallic Alkoxides 5 to complet
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Table 2.1 (Continued) Homometallic
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Homometallic Alkoxides 15 reactivit
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Homometallic Alkoxides 17 By contra
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Homometallic Alkoxides 19 2.3 React
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Homometallic Alkoxides 21 has been
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Homometallic Alkoxides 23 obtain on
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y Evans and co-workers: 160,161 Hom
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Homometallic Alkoxides 27 The heter
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Homometallic Alkoxides 29 not conve
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Homometallic Alkoxides 31 In view o
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2.7.2 Steric Factors Homometallic A
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Homometallic Alkoxides 35 (b) When
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Homometallic Alkoxides 37 2.8 Trans
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Homometallic Alkoxides 39 with orga
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2.9.1.1 Alkoxides of Be, Mg, Ca, Sr
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MfN⊲SiMe3⊳2g2thfx C2HOR, Cpy !C
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Homometallic Alkoxides 45 2.10 Misc
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Zr⊲CH2Bu t ⊳4 C 4RfOH benzene !
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2.10.5 By Insertion of Oxygen into
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Homometallic Alkoxides 51 First hom
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O M R M OR M OR RO M (M = Tl; R = M
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Homometallic Alkoxides 55 3. Nuclea
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Homometallic Alkoxides 57 explain t
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Decomposition (%) 100 80 60 40 20 0
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Table 2.6 Volatilities of tetravale
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Homometallic Alkoxides 63 deduced t
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Table 2.10 Vapour pressure of Ti, Z
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Homometallic Alkoxides 67 Table 2.1
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3.2.10 Alkoxides of Later 3d Metals
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Homometallic Alkoxides 71 Table 2.1
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Homometallic Alkoxides 73 affected
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Homometallic Alkoxides 75 the range
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Homometallic Alkoxides 77 several c
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Homometallic Alkoxides 81 In toluen
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Bu t O Bu t O Bu t O Th O O Bu O t
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Homometallic Alkoxides 85 1H NMR st
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Homometallic Alkoxides 87 septet wa
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Homometallic Alkoxides 89 experimen
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Table 2.21 1 H NMR spectra of Al4(O
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Homometallic Alkoxides 93 3.5 Elect
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Homometallic Alkoxides 95 ligand fi
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Homometallic Alkoxides 97 susceptib
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10 −1 /xM 12 10 −200 −100 0 [
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Homometallic Alkoxides 101 alkoxide
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Homometallic Alkoxides 103 fragment
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Homometallic Alkoxides 105 The mass
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Homometallic Alkoxides 107 [Al⊲OP
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Homometallic Alkoxides 109 Under ca
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4.3.2 Phenol-Alcohol Exchange React
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4.4 Reactions with Alkanolamines Ho
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Homometallic Alkoxides 115 R D Pr i
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Homometallic Alkoxides 117 La(OPr i
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Homometallic Alkoxides 119 with the
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Homometallic Alkoxides 121 about 1.
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Homometallic Alkoxides 123 concentr
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Homometallic Alkoxides 125 and othe
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Homometallic Alkoxides 127 Interest
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OH Monofunctional bidentate HC N R
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Homometallic Alkoxides 131 metal al
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Homometallic Alkoxides 133 which yi
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shown in Eq. (2.286): O Mo2(OEt)6 H
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Homometallic Alkoxides 137 Phenyl i
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Homometallic Alkoxides 139 The 1990
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Eqs (2.312)-(2.315): where R D l-ad
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Homometallic Alkoxides 143 On the b
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Homometallic Alkoxides 145 The form
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Homometallic Alkoxides 147 On furth
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4.16 Interactions Between Two Diffe
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4Mo2(OPr i )6 + 18CO (excess) Homom
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isolobality of CR 0 and W⊲OR⊳3
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W2(OR)8 (R = CH2Bu t ) + CO + H2C C
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Homometallic Alkoxides 157 43. J.S.
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Homometallic Alkoxides 159 122. P.N
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Homometallic Alkoxides 161 201. A.
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Homometallic Alkoxides 163 281. R.C
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Homometallic Alkoxides 165 358. L.A
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Homometallic Alkoxides 167 430. M.R
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Homometallic Alkoxides 169 521. I.
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Homometallic Alkoxides 171 N.I. Koz
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Homometallic Alkoxides 177 876. J.
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Homometallic Alkoxides 179 966. H.
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Homometallic Alkoxides 181 1054. M.
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184 Alkoxo and Aryloxo Derivatives
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236 Table 4.1 (Continued) M-O Bond
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244 Table 4.3 Alkoxides of aluminiu
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Page 249 and 250: 248 Table 4.4 Alkoxides of germaniu
Page 251 and 252: 250 Alkoxo and Aryloxo Derivatives
Page 257 and 258: 256 Table 4.6 Alkoxides of scandium
Page 265 and 266: 264 Table 4.7 Alkoxides of lanthani
Page 271 and 272: 270 Table 4.8 (Continued) M-O Bond
Page 277 and 278: 276 Table 4.9 Alkoxides of titanium
Page 279 and 280: 278 Table 4.9 (Continued) Bond leng
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Page 303 and 304: 302 Table 4.11 (Continued) Metal M-
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Page 323 and 324: 322 Table 4.12 Alkoxides of mangane
Page 333 and 334: 332 Table 4.16 Alkoxides of zinc, c
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Page 349 and 350: 348 Table 4.18 Bimetallic alkoxides
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350 Table 4.18 (Continued) Coordina
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354 Table 4.19 Heterometallic alkox
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394 Table 5.2 Chemical shifts from
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400 Table 5.3 Scandium, yttrium, la
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402 Table 5.3 (continued) Metal Oxo
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406 Table 5.4 Titanium and zirconiu
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420 Table 5.6 Chromium sub-group me
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1 INTRODUCTION 6 Metal Aryloxides T
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Metal Aryloxides 447 or both of the
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R1 OH O R2 R3NH2 −H2O Scheme 6.3
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Cl S N N OH O Cl Me 3C NH HN OH HO
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N OH N OH Me 3C Me3C HO HO N N OH H
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Metal Aryloxides 455 2Ln C 3Hg⊲C6
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Metal Aryloxides 457 Mixed halo, ar
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product metal aryloxide 1e,1f (Eqs
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Metal Aryloxides 461 Eqs 6.39 and 6
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O Mg Mg OAr O Metal Aryloxides 463
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3.7 From Metal Hydrides Metal Arylo
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Metal Aryloxides 467 Two other impo
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Metal Aryloxides 469 Table 6.1 Meta
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Table 6.3 W-OAr distances for vario
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Metal Aryloxides 473 At first it is
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Zr−O distance (Å) V−O distance
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Metal Aryloxides 477 as expected ar
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Metal Aryloxides 479 whereas R D Me
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where OAr = O But But H3C H3C O Ta
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PPh 2 Ph P Pt OAr PPh2 where OAr =
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6 SURVEY OF METAL ARYLOXIDES 6.1 Sp
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487 Na2[V(O) 2(OAr) 2]2.4H2O.DMF 6-
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489 [Tc(O)(OAr)(di-OAr)] 8-quin 2.0
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491 [Ni3⊲OAr⊳6][ClO4].EtOH 8-qu
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493 [Pt(OAr⊳2](tcnq) sq. planar P
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495 [Al(OAr) 3].MeOH 8-quin 1.850 (
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497 [Sb(OAr) 2⊲S2COEt⊳] pentago
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499 [Tc(O)(OAr)(N-salicylideneDD-gl
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Metal Aryloxides 501 A contribution
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503 Table 6.8 Metal bi-phenolates B
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505 Table 6.9 Metal binaphtholates
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507 [TiCl2(di-OAr)]2 two tetrahedra
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Metal Aryloxides 509 co-workers hav
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511 [Li⊲ 2-OAr⊳]3 planar Li3O3
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513 Table 6.11 Sodium aryloxides Bo
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Table 6.12 Potassium aryloxides Met
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Table 6.15 Magnesium aryloxides Met
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519 Table 6.18 Barium aryloxides Bo
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521 Table 6.19 Group 3 metal and la
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523 [Me4N]La2Na2⊲ 4-OAr⊳⊲ 3-O
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525 [Nd⊲OC6H3Ph- 6-C6H5⊳⊲OC6H
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527 [⊲THF⊳Li⊲ 2-OAr⊳2Sm⊲C
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529 [Eu⊲ 2-OAr⊳4⊲OAr⊳2⊲ 3
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531 [Yb(OAr) 3⊲THF⊳2].THF squar
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Metal Aryloxides 533 carbon atoms a
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535 [Cp Ł Th(OAr)⊲CH2SiMe3⊳2]
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Metal Aryloxides 537 amido compound
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539 Table 6.21 Titanium aryloxides
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541 [Ti2⊲ 2-OAr⊳2(OAr) 2Cl4]2 e
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543 [Ti(OAr) 2⊲NMe2⊳2] tetrahed
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545 [Ti(OAr) 3Bu t ] tetrahedral Ti
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547 [⊲ArO⊳2Ti⊲ 2-ButNDCC4Et4C
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549 [Cp⊲C5H3Me-Pri-1,2)Ti(OAr)Cl]
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551 [CpTi(OAr) 2⊲HPPh⊳] OC6H3Pr
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553 [Ti⊲di-OAr⊳Cl2].THF 6-coord
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555 Table 6.22 Zirconium aryloxides
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557 [Zr(Ind-OAr) 2] 1-indenylphenox
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559 [Cp2Zr(OAr)] 18-electron Zr, tw
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Metal Aryloxides 561 The thermal st
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Metal Aryloxides 563 can only arise
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565 1.839 (2) 138 1.854 (2) 140 [(t
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567 [V(OAr) 3-N-Li(THF) 3] tetrahed
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569 [V(O)(di-OAr)] 6-coord. V, both
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571 cis,mer-[Nb(OAr) 2Cl3(THF)] dis
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573 [Nb⊲OC6H3Ph- 4-C6H7⊳⊲OAr
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575 Table 6.26 Tantalum aryloxides
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577 [(THF)(ArO) 3Ta⊲DNND⊳Ta(OAr
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579 [Ta(OAr) 2Cl2⊲CH2C6H5⊳] tbp
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581 [Ta(OAr) 2Cl⊲ 6-C6Me6⊳] OC6
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583 [Ta(OAr)⊲OC6H3Pri- 2-CMeDCH2
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585 [f(TMEDA)Na⊲ 2-OAr⊳2g2Cr] 4
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587 Table 6.28 Molybdenum aryloxide
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589 [Mo2⊲OAr⊳5⊲NMe2⊳⊲HNMe
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591 [Mo(Hdi-OAr) 2] 6-coord. Mo, on
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593 [W2⊲OAr⊳6⊲HNMe2⊳2] OC6F
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595 [W(OAr) 2⊲DNBu t ⊳2] OC6H3P
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597 [W(OC6H3Ph- 1-C6H4⊳2⊲PMePh2
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599 [W⊲OC6HPh3- 1-C6H4-c-C5H8C- O
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601 [⊲OC⊳3Mn⊲C4H4N⊳Mn⊲CO3
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603 Table 6.32 Simple aryloxides of
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607 [NEt4]3fFe6⊲ 4-S⊳4⊲OAr⊳
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609 [Ru(OAr) 2(CO)(py-CMeO-4)] cis-
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Table 6.35 Simple aryloxides of osm
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Metal Aryloxides 613 states, e.g. [
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Bu t O Bu t (6-I) Bu t Bu t O Metal
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6.2.10 Group 9 Metal Aryloxides Met
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Table 6.38 Simple aryloxides of iri
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Metal Aryloxides 621 Table 6.39 (Co
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623 [Pd(OAr)⊲C6H3fCH2NMe2g2-2,6)]
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Metal Aryloxides 625 Table 6.41 Sim
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629 [(RNC) 2Cu⊲ 2-OAr⊳2Cu(CNR)
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Metal Aryloxides 631 The two-coordi
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Table 6.45 (Continued) Metal Arylox
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Table 6.47 Simple aryloxides of mer
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637 Table 6.48 Aluminium aryloxides
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639 [⊲ArO⊳2Al⊲ -OAr⊳2Mg(THF
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641 [Al(OAr) 2⊲i-Bu⊳] trigonal
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643 [Al(OAr)Cl(Me)⊲NH2But⊳] OC6
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645 Table 6.49 Gallium aryloxides B
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647 Table 6.50 Indium aryloxides Bo
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Metal Aryloxides 649 Table 6.53 Tin
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651 Table 6.56 Bismuth aryloxides B
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REFERENCES Metal Aryloxides 653 1.
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Metal Aryloxides 655 56. Y. Nakayam
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Metal Aryloxides 657 123. T.W. Coff
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Metal Aryloxides 659 202. A. Bell,
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Metal Aryloxides 661 268. K. Ishiha
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Metal Aryloxides 663 341. B.S. Kali
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Metal Aryloxides 665 405. P.N. Rile
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Metal Aryloxides 667 483. Y. Hayash
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Metal Aryloxides 669 561. A.P. Shre
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688 Index alkoxometallate(IV) ligan
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690 Index cerium oxo-isopropoxide 3
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692 Index gas-phase photoelectron s
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694 Index lead tert-butoxide 386 Le
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696 Index metal-hydrogen bonds clea
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698 Index oxo-alkoxides 384, 385, 3
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700 Index sodium hydroxide 142 sodi
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702 Index titanium dichloride dieth
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704 Index X X-ray Absorption Near E
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2 Homometallic Alkoxides

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