Syntheses and Theoretical and Mechanistic Aspects of 1-Thia-2,4- and 1-Thia-3,4-diphosphole Formed from CS<sub>2</sub> and <sup>t</sup>BuCP and Crystal and Molecular Structure of the First 1-Thia-3,4-diphosphole Complex: cis-[{PtCl<sub>2</sub>(PEt<sub>3</sub>)}<sub>2</sub>(P<sub>2</sub>SC<sub>2</sub><sup>t</sup>Bu<sub>2</sub>)]
作者:Sarah E. d'Arbeloff-Wilson、Peter B. Hitchcock、Steffen Krill、John F. Nixon、László Nyulászi、Manfred Regitz
DOI:10.1021/ja992325p
日期:2000.5.1
The reaction of (BuCP)-Bu-1 with CS2 (or its ylide type complexes such as R3PCS2 (R = Et, Ph, cyclohexyl), (C5H10N)(2)CCS2, or (C4H8NO)(2)CCS2) gives a mixture of 3,5-di-tert-butyl-1-thia-2,4-diphosphole and 2,5-di-tert-butyl-1-thia-3,4-diphosphole, which were characterized by NMR spectroscopy. The latter was also characterized by the single-crystal X-ray structure determination of its bis(platinum(II)) complex [(PtCl2PEt3)(2)(mu-(P2SC2Bu2)-Bu-t)] This is the first structural characterization of a 1-thia-3,4-diphosphole ring. The mechanism of these reactions was explored by B3LTP/6-311+G** level quantum chemical calculations. The reaction pathway involves a phosphadithiolediylcarbene and its diphosphatetrathiafulvalene dimer as intermediates. Several other possible reaction pathways were ruled out.