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2 Homometallic Alkoxides

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270<br />

Table 4.8 (Continued)<br />

M–O Bond lengths ( ˚A)<br />

Metal Bond angles ( Ž )<br />

Compound coordination Terminal Bridging � MOC Reference<br />

[U2⊲ -OPr i ⊳2⊲OPr i ⊳8] 6 2.02–2.05 (1)<br />

av. 2.03<br />

2.28, 2.29 (1) 160–165 (t)<br />

av. 163<br />

128 (b)<br />

[U2⊲ -OPr i ⊳2⊲OPr i ⊳2I4⊲PriOH⊳2] 6 2.02 (1) 2.27, 2.32 (1) 166.7 (t) 152<br />

[U⊲OC2Ph4O⊳2⊲thf⊳2] 6 2.131–2.162 (4)<br />

av. 2.152<br />

– – 153<br />

[U⊲OCBu t<br />

3⊳⊲BH4⊳3⊲thf⊳] [U⊲OCBu<br />

5 1.97 (1) – 178.6 154<br />

t<br />

3⊳3⊲BH4⊳] 4 2.073–2.077 (7)<br />

av. 2.075<br />

– 167.9–172.8<br />

av. 170.6<br />

154<br />

[U⊲OCHPh2⊳⊲BH4⊳3⊲thf⊳2] 6 2.037 (3) – 166.7 155<br />

[U⊲OCHPh2⊳2⊲BH4⊳2⊲thf⊳2] 6 2.070 (4) – 161.0 155<br />

[U2⊲ -OPr i ⊳2⊲OPr i ⊳2⊲C3H5⊳4] 512.056 (13) 2.271, 2.413 (10) 178 (t)<br />

120, 129 (b)<br />

156<br />

[⊲cot⊳2U2⊲ -OEt⊳2⊲BH4⊳2] 51 cot D C8H8-cyclo<br />

– 2.296 (5) 117.8, 130.3 157<br />

[⊲cot⊳2U2⊲ -OPr i ⊳2⊲OPr i ⊳2] 512.027, 2.070 (8) 2.297–2.317 (6) 161.7, 168.3 (t) 157<br />

av. 2.308<br />

112.2–134.2 (b)<br />

av. 123.7<br />

b D bridging, t D terminal; ax D axial, eq D equatorial.<br />

1 Coordination doubtful.<br />

151

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