| Autor: |
Burland, M. C., Pontz, T. W., Meyer, T. Y. |
| Zdroj: |
Organometallics; April 2002, Vol. 21 Issue: 9 p1933-1941, 9p |
| Abstrakt: |
Tantalum imido compound CpTa(&dbd;NBut)Cl2 (1) reacts with imines to give NR exchange (metathesis) products. Addition of <5 mol % of compound 1 to a 1:1 mixture of two different imines resulted in catalytic cross metathesis of the two imines to give an equilibrium mixture of imines. Kinetic studies of the reaction of 1 with excess imine (But)HC&dbd;N(p-tolyl) (2a) gave an average kobs of 1.29 × 10-4 min-1 (σ 0.28). Pseudo-first-order behavior was observed for 1. The dependence of kobs on the concentration of 2a was found to be nonlinear and dependent on catalytic amounts of contaminant amine p-tolylamine (9). Reaction of 1 with tert-butylamine (6) results in the formation of the imide/amide CpTa(&dbd;NBut)(NHBut)Cl (7) and HCl. Compound 7 did not react with imines to give exchange products, so it is proposed that the reaction of 1 with imines is significantly accelerated by the presence of HCl. |
| Databáze: |
Supplemental Index |
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