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2 Homometallic Alkoxides

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602 Alkoxo and Aryloxo Derivatives of Metals<br />

L<br />

R<br />

R<br />

Cl<br />

Cl<br />

R<br />

R<br />

O<br />

Ta<br />

O<br />

OAr′<br />

Cl Ta Cl<br />

Cl<br />

OAr<br />

Ta<br />

OAr<br />

Cl<br />

Ta<br />

OAr<br />

OAr<br />

OAr<br />

OAr′<br />

R<br />

(i)<br />

(ii)<br />

(ii)<br />

L<br />

L<br />

(i)<br />

H<br />

H<br />

H<br />

H<br />

OAr<br />

Ta<br />

OAr<br />

OAr<br />

OAr′<br />

Ta<br />

OAr′<br />

OAr<br />

Cl<br />

OAr<br />

L<br />

Ta H<br />

OAr = 2,6-diisopropyl, OAr′ = 2,6-di-tert-butylphenoxide,<br />

L = tertiary phosphine, R = CH2C6H4Me-4.<br />

n<br />

Reagents: (i) L, H2 (1200 psi), 80° C; (ii) Bu3SnH, L.<br />

Cl<br />

Scheme 6.8<br />

Table 6.31 Simple aryloxides of technecium<br />

L<br />

Cl<br />

(ii)<br />

H<br />

O<br />

L<br />

Ta H<br />

H<br />

O<br />

L<br />

H<br />

H<br />

OAr<br />

L<br />

Ta Cl<br />

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

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

[Tc(OAr) 3]<br />

mer-TcO3P3 core<br />

[Tc(O)Cl(OAr) 2]<br />

cis-O(Ar), trans<br />

ArO–ReDO<br />

OC6H4PPh2-2 2.000 (3)<br />

1.990 (3)<br />

2.074 (3)<br />

OC6H4PPh2-2 1.985 (6)<br />

1.998 (6)<br />

iC. Bolzati, F. Refosco, F. Tisato, G. Bandoli, and A. Dolmella, Inorg. Chim. Acta, 201, 7<br />

(1992).<br />

iiC. Bolzati, F. Tisato, F. Refosco, and G. Bandoli, Inorg. Chim. Acta, 247, 125 (1996).<br />

123<br />

124<br />

121<br />

123<br />

127<br />

OAr<br />

L<br />

i<br />

ii

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