Synthesis of Group 4 transition-metal complexes bearing a secondary phosphine pendant cyclopentadienyl ligand
Reactions of some chlorides of the Group 4 transition metals were examined with secondary phosphine pendant cyclopentadienyl derivatives, XC 5H 4CH 2CH 2PHR (X=Li, SiMe 3, Sn( n-Bu) 3; R=2,4,6-trimethylphenyl (Mes), 2,4,6-tri- i-propylphenyl (Tip), 2,4,6-tri- t-buthylphenyl (Mes*)). Although reactio...
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Published in | Journal of organometallic chemistry Vol. 648; no. 1; pp. 231 - 236 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.04.2002
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Subjects | |
Online Access | Get full text |
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Summary: | Reactions of some chlorides of the Group 4 transition metals were examined with secondary phosphine pendant cyclopentadienyl derivatives, XC
5H
4CH
2CH
2PHR (X=Li, SiMe
3, Sn(
n-Bu)
3; R=2,4,6-trimethylphenyl (Mes), 2,4,6-tri-
i-propylphenyl (Tip), 2,4,6-tri-
t-buthylphenyl (Mes*)). Although reactions of MCl
4 (M=Zr, Hf) did not yield (C
5H
4CH
2CH
2PHR)MCl
3, reactions of MCl
4(SR′′
2)
2 (SR′′
2=SMe
2, tetrahydrothiophene) gave (C
5H
4CH
2CH
2PHR)MCl
3(SR′′
2)
n
(
n=1, 2). The steric bulkiness of the substituent (R) on the secondary phosphine affects the coordination mode of the phosphine moiety in solution. When R is Mes, the phosphine-coordinated species is stable, when R is Tip, the phosphine-coordinated and -dissociated species are in equilibrium, and when R is Mes*, only the phosphine-dissociated species is observed.
Reactions of some chlorides of the Group 4 transition metals were examined with secondary phosphine pendant cyclopentadienyl derivatives and it was found that MCl
4(SR′′
2)
2 (SR′′
2=SMe
2, tetrahydrothiophene) reacts with (ER′
3)C
5H
4CH
2CH
2PHR (ER′
3=SiMe
3, Sn(
n-Bu)
3) to give (C
5H
4CH
2CH
2PHR)MCl
3(SR′′
2)
n
(M=Zr, Hf;
n=1, 2). The steric bulkiness of the substituent (R) on the secondary phosphine affects the coordination mode of the phosphine moiety in solution. |
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ISSN: | 0022-328X 1872-8561 |
DOI: | 10.1016/S0022-328X(01)01473-5 |