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2 Homometallic Alkoxides

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470 Alkoxo and Aryloxo Derivatives of Metals<br />

Table 6.2 M–OAr distances for various aryloxide derivatives of niobium and<br />

tantalum<br />

Coordination Electron Bond length ( ˚A)<br />

Compound number count M–OAr Ref.<br />

[Nb⊲OC6H3Me2-<br />

3,5⊳⊲dmpe⊳2⊲CO⊳2]<br />

7 18 2.181 (4) i<br />

trans-[⊲Nb⊲OC6H4Me-4⊳2⊲dmpe⊳2] 6 15 2.022 (3), 2.023 (3) i<br />

[Ta⊲OC6H3Pri 2-2,6⊳2Cl2⊲H⊳⊲PMe2Ph⊳2] 7 14 1.902 (3) ii<br />

[Ta⊲OC6H3Pri 2-2,6⊳2Cl⊲H⊳2⊲PMe2Ph⊳2] 7 14 1.899 (5), 1.900 (5) ii<br />

all-trans-[NbCl2⊲OC6H3Pri 2-2,6⊳2⊲py⊳2] 6 13 1.903 (2), 1.889 (2) iii<br />

all-trans-[TaCl2⊲OC6H3Pri 2-2,6⊳2⊲py⊳2] 6 13 1.906 (3), 1.896 (3) iii<br />

all-trans-[NbCl2⊲OC6H3Pri 2- 2,6⊳2⊲PMe2Ph⊳2]<br />

6 13 1.901 (2) iii<br />

all-trans-[NbCl2⊲OC6H3Pri 2- 2,6⊳2⊲PPh3⊳2]<br />

6 13 1.892 (7) iii<br />

all-trans-[TaCl2⊲OC6H3Pri 2- 2,6⊳2⊲PMe3⊳2]<br />

6 13 1.904 (2) iii<br />

cis,mer-[NbCl3⊲OC6H3Pri 2-2,6⊳2⊲py⊳] 6 12 1.832 (3), 1.852 (3) iv<br />

cis,mer-[TaCl3⊲OC6H3Pri 2-2,6⊳2⊲py⊳] 6 12 1.841 (4), 1.848 (5) iv<br />

cis,mer-[NbCl3⊲OC6H3Pri 2- 2,6⊳2⊲PMe2Ph⊳]<br />

6 12 1.82 (2), 1.83 (2) iv<br />

trans,mer-[NbCl2⊲OC6H3Pri 2- 2,6⊳3⊲PMe2Ph⊳]<br />

6 12 1.868 (2), 1.894 (2),<br />

1.913 (2)<br />

iv<br />

trans,mer-[TaCl2⊲OC6H3Pri 2- 2,6⊳3⊲PMe2Ph⊳]<br />

6 12 1.863 (2), 1.897 (2),<br />

1.913 (2)<br />

iv<br />

trans,mer-[NbCl3⊲OC6H3Me2-<br />

2,6⊳2⊲THF⊳]<br />

6 12 1.829 (6), 1.854 (6) v<br />

trans-[NbCl4⊲OC6H3Me2-2,6⊳⊲THF⊳] 6 12 1.819 (8) v<br />

[Ta⊲OC6H3But 2-2,6⊳2Cl(H) 2⊲PMe2Ph⊳] 6 12 1.896 (3), 1.888 (3) ii<br />

[NbCl3⊲OC6HPh4-2,3,5,6⊳2] 5 10 1.820 (3), 1.870 (3) vi<br />

[TaCl3⊲OC6H3But 2-2,6⊳2] 5 10 1.872 (5), 1.836 (4) vii<br />

[Nb⊲OC6H4Me2-2,6⊳5] 5 10 1.890 (2)–1.910 (2) i<br />

i T.W. Coffindaffer, B.D. Steffy, I.P. Rothwell, K. Folting, J.C. Huffman, and W.E. Streib, J.<br />

Am. Chem. Soc., 111, 4742 (1989).<br />

ii B.C. Parkin, J.C. Clark, V.M. Visciglio, P.E. Fanwick, and I.P. Rothwell, Organometallics, 14,<br />

3002 (1995).<br />

iii S.W. Schweiger, E.S. Freeman, J.R. Clark, M.C. Potyen, P.E. Fanwick, and I.P. Rothwell,<br />

Inorg. Chim. Acta, 307, 63 (2000).<br />

iv J.R. Clark, A.L. Pulvirenti, P.E. Fanwick, M. Sigalis, O. Eisenstein, and I.P. Rothwell, Inorg.<br />

Chem., 36, 3623 (1997).<br />

v H. Yasuda, Y. Nakayama, K. Takei, A. Nakamura, Y. Kai, and N. Kanehisa, J. Organomet.<br />

Chem., 473, 105 (1994).<br />

vi M.A. Lockwood, M.C. Potyen, B.D. Steffey, P.E. Fanwick, and I.P. Rothwell, Polyhedron, 14,<br />

3293 (1995).<br />

vii L.R. Chamberlain, I.P. Rothwell, and J.C. Huffman, Inorg. Chem., 23, 2575 (1984).

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