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2 Homometallic Alkoxides

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576<br />

Table 6.26 (Continued)<br />

Bond length ( ˚A) Bond angle ( Ž )<br />

Compound Aryloxide M–O M–O–Ar Reference<br />

[Ta⊲ 2-Cl⊳⊲OAr⊳2Cl2]2<br />

edge-shared bis-octahedron, OAr trans to<br />

bridging chloride groups, 6-coord. Nb<br />

cis,mer-[Ta(OAr) 2Cl3⊲py⊳]<br />

distorted octahedron<br />

cis,mer-[Ta(OAr) 2Cl3⊲ 1-dcpm)] distorted octahedron<br />

all trans-[Ta(OAr) 2Cl2⊲py⊳2]<br />

octahedron<br />

all trans-[Ta(OAr) 2Br2⊲PMe2Ph⊳2]<br />

octahedron<br />

all trans-[Ta(OAr) 2Cl2⊲PMe2Ph⊳2]<br />

octahedron<br />

[Ta2⊲ 2-OMe⊳2⊲OAr⊳4⊲OMe⊳4]<br />

6-coord. Ta<br />

OC6H3Prt 2-2,6 1.815 (12)<br />

1.791 (14)<br />

173<br />

171<br />

OC6H3Pri 2-2,6 1.841 (4)<br />

1.848 (5)<br />

174<br />

174<br />

vi<br />

OC6H3Pri 2-2,6 1.855 (7)<br />

1.889 (6)<br />

171<br />

180<br />

vii<br />

OC6H3Pri 2-2,6 1.906 (3)<br />

1.896 (3)<br />

164<br />

164<br />

viii<br />

-2,6 1.900 (4) 175 viii<br />

OC6H3Pr i 2<br />

[Ta(OAr)⊲NMe2⊳4] OC6H2(tetrahydronaphthyl)-2-But 2<br />

[Ta(OAr)⊲NMe2⊳4] OC6H2Ph2-2,6-But 2<br />

[Ta(OAr)⊲OAr 0 ⊳⊲NMe2⊳3] OC6H2(tetrahydronaphthyl)-2-Bu t 2<br />

OC6H2Pri 2-2,6-Br-4 1.909 (3) 175 viii<br />

OC6H3Pri 2-2,6 1.888 (4)<br />

1.919 (4)<br />

179<br />

161<br />

ix<br />

-4,6<br />

-3,5<br />

-4,6<br />

OC6HPh4-2,3,5,6<br />

1.954 (3)<br />

1.950 (3)<br />

1.948 (3)<br />

2.012 (3)<br />

162<br />

172<br />

155<br />

159<br />

xxvi<br />

x<br />

xxvi<br />

[Ta(OAr)Cl2⊲DNC6H3Pri-2,6)⊲py⊳2] [Ta(OAr) 3(xyNCbzDCbzNxy⊳]<br />

tbp Ta, axial OAr and N<br />

OC6H3Me2-2,6<br />

OC6H3Me2-2,6<br />

1.905 (5)<br />

1.904 (6)<br />

1.898 (5)<br />

145<br />

171<br />

163<br />

xi<br />

xii, xiii<br />

1.880 (6)<br />

167<br />

[Ta(OAr) 2⊲DNC6H3Pri 2-2,6)(RNC6H3Pri 2-2,6)] OC6H3Me2-2,6 1.916 (5)<br />

1.923 (5)<br />

150<br />

150<br />

xii, xiv<br />

[Ta2Cl3(O)(OAr) 5] OC6H3Pri 2-2,6 1.81 (2)<br />

1.83 (1)<br />

163<br />

159<br />

iii<br />

1.77 (2)<br />

161<br />

1.99 (2)<br />

174<br />

2.19 (2)<br />

162<br />

vi

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