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2 Homometallic Alkoxides

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Table 4.17 Alkali metal bimetallic alkoxides<br />

Coordination no.<br />

Alkali<br />

metal<br />

Other<br />

metal<br />

M–O Bond lengths ( ˚A)<br />

Bond angles ( Ž )<br />

Compound (M) (M0 ) Terminal Bridging MOC � Reference<br />

[f⊲py⊳2Lig -fO⊲SiPh2O⊳3g -fO-<br />

⊲SiPh2Og2Mg]<br />

4 4 – LiO, 1.925–2.000 (9)<br />

av. 1.963<br />

MgO, 1.923–1.954 (3)<br />

av. 1.936<br />

– 447<br />

[⊲thf⊳2Li⊲ -OBu t ⊳2YfC5H4⊲SiMe3⊳g2] 4 41 – LiO, 1.950, 1.968 (28)<br />

YO, 2.148, 2.157 (11)<br />

– 448<br />

[f⊲thf⊳2Li⊲ -OBu t ⊳g2⊲ 2-<br />

4 5 – LiO, 1.913, 1.953 (12)<br />

– 449<br />

CH2SiMe2⊳Y⊲CH2SiMe3⊳2]<br />

[f(thf)Lig4⊲ 4-OBu<br />

YO, 2.174, 2.192 (4)<br />

t ⊳4⊲ 4-<br />

Cl⊳4Y⊲CH2SiMe3⊳x ⊲OBu t ⊳1 x ] C<br />

4 5 – LiO, 1.982–2.025 (14)<br />

av. 1.996<br />

YO, 2.261–2.276 (5)<br />

av. 2.269<br />

– 450<br />

[(thf)Li⊲ -OBu t ⊳2YfCH⊲SiMe3⊳2g2] 3 4 – LiO, 1.92 (2)<br />

LiO, 116.9, 126.9 (b) 451<br />

YO, 2.117, 2.125 (8) YO, 140.8, 151.6 (b)<br />

[⊲thf⊳3Li⊲ -Cl⊳Y⊲OCBu t<br />

3⊳3] [Li2⊲ 3-OPr<br />

4 4 – YO, 2.150, 2.158, 2.171 (3) YO, 170.2 (t) 452<br />

i ⊳2⊲ -OPr i ⊳4Ti⊲OPr i ⊳4] 4 5 TiO, 1.782, 1.829 (9) LiO, 1.928, 1.930 (23) ⊲ ⊳ LiO, 123.3 ( 3, b)<br />

1.982, 1.984 (23) ⊲ 3⊳ 132.7 ( ,b)<br />

TiO, 1.886, 1.900 (9) ⊲ ⊳ TiO, 126.6 ( 3, b)<br />

1.988 (8) ⊲ 3⊳<br />

128.6, 129.3 ( ,b)<br />

TiO, 140.3, 170.2 (t)<br />

453<br />

[f(thf)Lig2⊲ 3-OMe⊳2⊲ -<br />

OPr i ⊳4fTi⊲OPr i ⊳2g2]<br />

4 6 TiO, 1.815, 1.833 (7) LiO, 1.997 (15) ⊲ 3⊳<br />

1.853 (16) ⊲ ⊳<br />

TiO, 2.123 (6) ⊲ 3⊳<br />

1.957 (7) ⊲ ⊳<br />

LiO, 123.1 ( 3, b)<br />

132.0 ( ,b)<br />

TiO, 118.1 ( 3, b)<br />

127.7 ( ,b)<br />

TiO, 141.1, 167.0 (t)<br />

176<br />

[Et2O⊳2Li⊲ -Cl⊳2ZrCl⊲OCBu t<br />

3⊳2] 4 5 ZrO, 1.889, 1.900 (8) – ZrO, 166.0, 171.9 (t) 454<br />

339<br />

(countinued overleaf )

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