Substituent Effect on Organotin Tp*Compounds as the Tp*Reagent for the Preparation of Mono Tp*Complexes of Group 4—6 Metals (Tp*= Tris(3,5-dimethylpyrazol-1-yl)hydroborate)
| Autor: | Shin Ichi Kawamura, Toshiyuki Oshiki, Kazuhide Tani, Kazushi Mashima, Kazuo Kitaura |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Bulletin of the Chemical Society of Japan. 73:1735-1748 |
| ISSN: | 1348-0634 0009-2673 |
| Popis: | Organotin compounds [Tp*SnCl3-nBun] (2: n = 1; 3: n = 2) having a Tp* ligand (Tp* = tris(3,5-dimethylpyrazol-1-yl)hydroborate) are useful reagents for introducing a Tp* ligand on Group 4 and 5 metals and chromium. The test reactions of these organotin compounds along with [Tp*SnCl3] (1) with ZrCl4, affording a known complex [Tp*ZrCl3] (4), were examined. The reaction rates were in the order 3 > 2 1. This tendency was understood by the average Sn-N(Tp* ligand) bond distance being longer in the order 3 > 2 > 1 as revealed by the crystallographic studies and the orbital interactions between the Tp* ligand and the SnCl3-nBun fragments estimated by the ab initio calculations for 1—3. On the basis of the above findings, we applied the compound 3 to prepare Tp* complexes of Group 4—6 metals. Reactions of TiCl4 with an equimolar amount of 3 afforded [Tp*TiCl3] (7) in good yields after a simple rinse to remove the resulting tin compound, SnBu2Cl2. [Tp*HfCl3] (8) was prepared in moderate yield by reaction of [HfCl4... |
| Databáze: | OpenAIRE |
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