X-Ray Crystal Structures of Alkoxo Metal Compounds - Alkoxo and Aryloxo Derivatives of Metals - page 233

Table 4.1 Alkali metal alkoxides

M-O Bond lengths ( A)

Metal Bond angles ( Ž )

MOC

Compound coordination Terminal Bridging Reference

[LiOMe] 1 4 - 1.95 114.5 23

[Li 3 -OCMe 2 Ph ] 6 3 - 1.874 - 1.979 (3)

(av. 1.915)

115.9 - 139.9
(av. 124.0)

24

[Li -OCBu t 3 ] 2

2 - 1.75 (8) - 25

[Lif -OB[CH SiMe 3 2 ] 2 g 2 ] 2 2 - 1.78 (2) - 25

[LifOB[CH SiMe 3 2 ] 2 g Me 2 NC 2 H 4 NMe 2 ] 3 1.667 (15) - - 25

[Li -OCBu t CH 2 PMe 2 ] 2

3 1.78 (1) - - 26

[Li -OCBu t CH 2 PPh 2 ] 2

3 1.792 (9) - - 26

[Li -OCBu t 3 thf ] 2 3 - 1.84 (1) - 27

[Lif -OB Mes 2 g thf ] 2 3 - 1.849 (7) - 28

[Li 3 - N -methylpseudoephedrate ] 2 3 - 1.870 - 1.985 (13)

(av. 1.929)

- 29

[Li -OSiPh 3 MeOC 2 H 4 OMe ] 2 3 - 1.881 - 1.910 (9)

(av. 1.895)

133.0 - 143.5
(av. 136.9)

30

[f Ph 2 SiOLi 2 O thf g 2 DABCO 2 ] 3 - 1.803, 1.877 (10) - 31

[f Ph 2 SiOLi 2 O thf g 2 DABCO 2 ] 4 - 1.889, 2.014 (10) - 31

[f Ph 2 SiOLi 2 O thf g 2 4 , 4 0 -bipy 2 ] 4 - 1.983 (8) - 31

[LiOCH(C 6 H 4 OMe NMeC 2 H 4 NMe 2 ] 4 4 - 1.852 - 1.909 (8) - 32

[NaOMe] 1 4 - 2.32 (1) 110.6 33

NaOBu t 6 4 - 2.14 - 2.32 (3)

(av. 2.24)

- 34

( continued overleaf )