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2 Homometallic Alkoxides

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322<br />

Table 4.12 <strong>Alkoxides</strong> of manganese, technetium, and rhenium<br />

M–O Bond lengths ( ˚A)<br />

Metal Bond angles ( Ž )<br />

Compound coordination Terminal Bridging � MOC Reference<br />

[MnII⊲OCPh3⊳2⊲py⊳2] [Mn<br />

4 1.956 (4) – 131.2 377<br />

IV⊲5-Cl-salahp⊳2] 5-Cl-salahp D OC2H6NCH2C6H3Cl(O)<br />

[Mn<br />

6 1.842, 1.854 (2) (alkoxo)<br />

1.892, 1.905 (2) (aryloxo)<br />

– – 378<br />

IVL] C<br />

L D N ,N 0 ,N 00-tris(2-olato-3-methylbutyl)- 6 1.819, 1.825, 1.831 (3) – – 379<br />

1,4,7-triazacyclononane<br />

[Mn4⊲ 3-OMe⊳4⊲MeOH⊳4L4]<br />

6 2.172 (9) (MeO)<br />

– – 380<br />

L D Me3CCO(CH)COCMe3 [Mn4⊲ 3-OMe⊳4⊲MeOH⊳4L4]<br />

L D PhCO(CH)COPh<br />

6<br />

2.273 (1) (MeOH)<br />

2.12 (4) (diket)<br />

2.174 (1) (MeO)<br />

2.253 (9) (MeOH)<br />

– – 380<br />

2.13 (3) (diket)<br />

[Re2⊲ -OMe⊳2⊲OMe⊳8]<br />

[Re2⊲ -Cl⊳2⊲dppm⊳2Cl3⊲OEt⊳]<br />

dppm D Ph2PCH2PPh2<br />

[Re2⊲OBu<br />

6<br />

6<br />

1.907, 1.943 (4)<br />

2.085 (14)<br />

2.036 (4)<br />

–<br />

124.9, 125.6 (t)<br />

129<br />

306<br />

381<br />

t⊳4⊲CBut⊳2] 41 [Re2fOCMe⊲CF3⊳2g4⊲CBu<br />

1.901, 1.909 (5) – 135.9 382<br />

t⊳2] 41 [RefOCMe⊲CF3⊳2g2⊲CBu<br />

1.925, 1.932 (5) – 136.9, 140.5 382<br />

t⊳⊲CHBut⊳⊲thf⊳] [RefOCMe⊲CF3⊳2g2⊲CBu<br />

5 1.954 (7) alkoxo,<br />

2.398 (8) thf,<br />

– av. 142.8 383<br />

t⊳⊲CHC5H4FeC5H5⊳] [Re3⊲ -Cl⊳3⊲OBu<br />

4 1.916, 1.928 (6) – 140.3, 141.8 384<br />

t⊳6] 411.982, 2.001, 2.009 (16) (long)<br />

1.794, 1.824, 1.844 (14) (short)<br />

– 141.1–145.4 385<br />

[Re3⊲ -Cl⊳⊲ -mentholate⊳2⊲mentholate⊳5Cl] 41 1.877–1.889 (15) av. 1.880 2.053–2.103 (14) 132.8 (t)<br />

385<br />

av. 2.084 121.0, 129.1 (b)<br />

[Re3⊲ -OPr i ⊳3⊲OPri⊳5H] 41 av. 1.90 (1) av. 2.11 (1) – 387<br />

[Re3⊲ -OPr i ⊳3(H)Cl⊲OPri⊳4⊲PMe3⊳] 51and 41 1.887–1.913 (6)<br />

2.073–2.125 (5) – 533<br />

av. 1.900<br />

av. 2.100<br />

[fRe⊲ -OPr i ⊳3Cl⊲OPri⊳4g2⊲ -Cl⊳2] 51and 41 1.860–1.911 (11)<br />

2.083–2.123 (10) – 533<br />

av. 1.885<br />

av. 2.105<br />

[Re3⊲ -OCH2But⊳3⊲OCH2But⊳6⊲PMe3⊳] 51and 41 1.903–2.047 (8)<br />

2.088–2.127 (7) – 533<br />

av. 1.941<br />

av. 2.113<br />

[Re3⊲ -OCH2But⊳2⊲ -Cl⊳⊲OCH2But⊳4Cl⊲PMe3⊳2] 51and 41 1.900, 1.915 (8) 2.073, 2.118 (7) – 533<br />

b D bridging, t D terminal.<br />

1 Coordination doubtful.

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