Unexpected Thermal Reactivity of Phosphirano-[1,2]thiaphosphole<i>P</i>-W(CO)<sub>5</sub>Complexes
作者:Stefan Maurer、Tamaki Jikyo、Gerhard Maas
DOI:10.1002/ejoc.200900002
日期:2009.5
2-dithiaphospholanes 12a–c are formed as minor byproducts of the thermal isomerization of phosphiranes 10. Compound 10a slowly rearranges in solution to give 12a as the sole product. Compounds 12 may result from a formal [3+2] cycloaddition reaction of an α,β-unsaturated thione, formed by partial decomposition of 10, with a dipolar valence isomer of 10 or 11, featuring aW(CO)5-complexed thiocarbonyl-phospha-ylide dipole
Spiro[fluorene-9,6'-[2]thia[1]phosphabicyclo[3.1.0]hex[3]enes] 7a–c 已经从 3,5-diaryl-1,2-thiaphospholes 和9-重氮芴或其2,7-二溴衍生物。双环膦对水稳定并且抵抗磷原子的硫化或硒化尝试。然而,用氯化氢裂解 P-C 环融合然后水解导致单环 2-(9H-芴-9-基)-2,3-二氢-1,2-硫杂磷 2-氧化物 8a-c。膦 7a-c 也反应形成六羰基钨 - (P-W) 配合物 10a-c 容易且产率高。这些配合物在 50–80 °C 的甲苯溶液中重排,形成螺[芴-9,2'-[1] 磷 [6] 噻二环 [3.1.0] 己-3-烯]-W(CO)5- (P-W) 络合物 11a-c,它们是环稠合噻吩的第一个代表。化合物 11a 很容易用三丁基膦脱硫,形成对氧高度敏感的螺[芴-9,2'-[2H]磷] 13,用硫处理后可重新转化为