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2 Homometallic Alkoxides

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Table 6.38 Simple aryloxides of iridium<br />

Metal Aryloxides 619<br />

Bond Bond<br />

length ( ˚A) angle ( Ž )<br />

Compound Aryloxide M–O M–O–Ar Ref.<br />

trans-[Ir(OAr)(CO)⊲PPh3⊳2]<br />

square planar Ir<br />

OC6H5 2.049 (4) 127 i<br />

trans-[Ir(OAr)(CO)⊲PPh3⊳2]<br />

square planar Ir<br />

OC6F52.058 (3) 135 ii<br />

mer-<br />

[Ir(OAr)Cl(H)⊲PMe3⊳3].0.5CH2Cl2<br />

octahedral Ir<br />

OC6H3Me2-3,5 2.109 (5) 130 iii<br />

[Cp Ł Ir(OAr)(Ph)⊲PMe3⊳] OC6H52.04 (1) 125 iv<br />

trans-[Ir(OAr)(CO)fP⊲ptolyl)3]⊲HOAr⊳g<br />

square planar Ir, non hydrogen<br />

bonded HOAr<br />

OC6H4Me-4 2.06 (7) 122 v<br />

[⊲COD⊳Ir⊲ 5- HOAr⊳][⊲COD⊳Ir⊲OAr⊳2]<br />

OC6H3Ph2-2,6 2.08 (1) 126 vi<br />

square planar anion 2.09 (1) 131<br />

[Ir(OAr)⊲OAr 0 ⊳⊲MeCN⊳] PBut 2⊲2-OC6H3OMe-6⊳ octahedral Ir, trans O CH2CMe2PBu<br />

2.062 (7) 119 vii<br />

t⊲2- OC6H3OMe-6⊳<br />

2.050 (6) 119<br />

iW.M. Rees, M.R. Churchill, J.C. Fettinger, and J.D. Atwood, Organometallics, 4, 2179 (1985).<br />

iiM.R. Churchill, J.C. Fettinger, W.M. Rees, and J.D. Atwood, J. Organomet. Chem., 308, 361<br />

(1986).<br />

iiiF.T. Ladipo, M. Kooti, and J.S. Merola, Inorg. Chem., 32, 1681 (1993).<br />

ivK.A. Woerpel and R.G. Bergman, J. Am. Chem. Soc., 115, 7888 (1993).<br />

vC.A. Miller, T.S. Janik, C.H. Lake, L.M. Toomey, M.R. Churchill, and J.D. Atwood, Organometallics,<br />

13, 5080 (1994).<br />

viD.E. Chebi, P.E. Fanwick, and I.P. Rothwell, Polyhedron, 9, 969 (1990).<br />

viiH.D. Empsall, P.N. Heys, W.S. McDonald, M.C. Norton, and B.L. Shaw, J. Chem. Soc.,<br />

Dalton Trans., 1119 (1978).<br />

aryloxide bonding, e.g. in [(CO)2Rh( -OAr)2Rh(CO)2] orsometimes 5 -bound cyclohexadienonyl<br />

groups as in [(COD)Ir( 5 -HOAr)][(COD)Ir(OAr)2] were observed. 102<br />

6.2.11 Group 10 Metal Aryloxides<br />

The aryloxide chemistry of the group 10 metals is dominated by compounds of general<br />

formula [M(OAr)(X)L2] where L can be a variety of N or P donor ligands and X can be<br />

groups such as Me or even OAr. By far the most extensive method of introducing the<br />

M–OAr group is by treatment of alkyl precursors with phenol. A consistent observation<br />

is that generation of the aryloxide [LnM(OAr)] is followed by formation of adducts<br />

[LnM(OAr)(HOAr)] where the phenolic proton is hydrogen bonded to the highly<br />

nucleophilic aryloxide oxygen atom. The electron-rich nature of the aryloxide group

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