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2 Homometallic Alkoxides

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302<br />

Table 4.11 (Continued)<br />

Metal<br />

M–O Bond lengths ( ˚A)<br />

Bond angles ( Ž )<br />

Compound coordination Terminal Bridging MOC � Reference<br />

[Mo2⊲ -C4H4⊳⊲ -OPr i ⊳2⊲OPr i ⊳5⊲py⊳] 611.88, 1.94, 1.94 (2) 2.06–2.17 (2) 134.1, 154.3,<br />

172.1 (t)<br />

137.0, 144.1 (b)<br />

233<br />

[Mo2⊲ -CO⊳⊲ -OPr i ⊳2⊲OPr i ⊳4⊲py⊳2] 6 1.909, 1.920 (5) 2.098, 2.113 (6) 135.2, 135.3 (t)<br />

137.3, 146.9 (b)<br />

234<br />

[Mo2⊲OBu t ⊳2⊲CH2SiMe3⊳4] 4 1.865 (8) – 158.4 235<br />

[Mo2⊲ -OCH2But⊳⊲ - 0 , 2-NCNMe2⊳⊲OCH2But⊳5] 511.870–1.954 (2) 1.999, 2.146 (2) 117.0–135.8 (t) 236<br />

av. 1.904<br />

av. 127.6<br />

128.6, 135.2 (b)<br />

[Mo2⊲ -O2CPh⊳2⊲OBu t ⊳4] 511.868, 1.903 (6) 2.125, 2.158 (6)<br />

(benzoate)<br />

124.6, 154.7<br />

⊲ButO⊳ 237<br />

[Mo2⊲OBu t ⊳4⊲acac⊳2] 511.888–1.919 (3)<br />

⊲ButO⊳ – 117.8–137.8<br />

⊲Bu<br />

av. 1.900<br />

2.064–2.117 (3)<br />

(acac)<br />

av. 2.092<br />

tO⊳ 238<br />

av. 131.8<br />

133.6–135.9<br />

(acac)<br />

av. 134.6<br />

[Mo2⊲ -OCH2But⊳2⊲OCH2But⊳2⊲CNBu t ⊳2⊲acac⊳2] 6 1.998, 2.020 (8) 2.042, 2.054 (6) 125.6 (t, neop) 239<br />

(neop)<br />

129.6 (b neop)<br />

2.098, 2.105 (7)<br />

(acac)<br />

127.7, 128.3 (acac)<br />

[Mo2⊲OPr i ⊳2⊲SAr⊳4]<br />

Ar D 2,4,6-trimethylphenyl<br />

4 1.878 (2) – 138.4 240<br />

[Mo2⊲OPr i ⊳2⊲SeAr⊳4]<br />

[Mo2⊲ -OCH2Bu<br />

4 1.873 (6) – 140.0 299<br />

t⊳2⊲ -Br⊳⊲OCH2But⊳4Br⊲py⊳] 6 1.872–1.905 (5)<br />

av. 1.887<br />

2.020–2.118 (5)<br />

av. 2.061<br />

128.8–135.3 (t)<br />

av. 130.6<br />

123.6–136.5 (b)<br />

av. 130.5<br />

241

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