有机化学 ›› 2017, Vol. 37 ›› Issue (1): 176-184.DOI: 10.6023/cjoc201608013 上一篇    下一篇

研究论文

OsXCl(PPh3)3(X=H,Cl)与炔丙基氯反应合成烯基卡拜配合物及膦配体调控的锇-氢卡拜向卡宾配合物的转化

杨玉, 蔡涛, 温庭斌   

  1. 厦门大学化学化工学院化学系 厦门 361005
  • 收稿日期:2016-08-18 修回日期:2016-09-04 发布日期:2016-09-06
  • 通讯作者: 温庭斌 E-mail:chwtb@xmu.edu.cn
  • 基金资助:

    国家重点基础研究发展计划(973计划,No. 2012CB821600)和国家自然科学基金(No. 21072161)资助项目.

Alkenylcarbyne Complexes Derived from the Reactions of OsXCl-(PPh3)3(X=H,Cl) with Propargyl Chloride and Phosphine Ligand-Controlled Transformation of Hydride-Carbyne to Carbene

Yang Yu, Cai Tao, Wen Tingbin   

  1. Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005
  • Received:2016-08-18 Revised:2016-09-04 Published:2016-09-06
  • Supported by:

    Project supported by the National Basic Research Program of China(973 Program, No. 2012CB821600) and the National Natural Science Foundation of China(No. 21072161).

简单的锇起始物OsHCl(PPh331)或OsCl2(PPh332)与3-氯-3-甲基-1-丁炔反应可分别得到锇的烯基卡拜配合物OsHCl2(≡CCH=CMe2)(PPh3)2(3)和OsCl3(≡CCH=CMe2)(PPh3)2(4).化合物3与二苯基(苯乙炔基)膦反应可转化为三个二苯基(苯乙炔基)膦配位的锇烯基卡宾配合物OsCl2(=CHCH=CMe2)(Ph2PC≡CPh)35),而化合物4与二苯基(苯乙炔基)膦反应得到膦配体取代产物OsCl3(≡CCH=CMe2)(Ph2PC≡CPh)26).二苯基(苯乙炔基)膦配体较弱的供电子能力及较小的空间位阻是促成化合物3发生锇上的原子氢配体到卡拜碳的1,2-迁移而转化为卡宾配合物5的原因.

关键词: 锇, 卡拜, 卡宾, 二苯基(苯乙炔基)膦, 炔丙基氯

Reactions of the simple osmium precursors OsHCl(PPh3)3(1) or OsCl2(PPh3)3(2) with 3-chloro-3-methylbut-1-yne afforded OsHCl2(≡CCH=CMe2)(PPh3)2(3) or OsCl3(≡CCH=CMe2)(PPh3)2(4),respectively.Treatment of 3 with Ph2PC≡CPh led to the formation of the tris-diphenyl(phenylethynyl) phosphine alkenylcarbene complex OsCl2(=CHCH=CMe2)(Ph2PC≡CPh)3(5),while complex 4 underwent simple phosphine ligand substitution with Ph2PC≡CPh to give OsCl3(≡CCH=CMe2)(Ph2PC≡CPh)2(6).Presumably,upon the phosphine ligand substitution of PPh3 in 3 by Ph2PC≡CPh,the relatively electron-poor nature of the later decreased the electron density of the osmium center,and thus promoted the transformation of the hydride-carbyne to carbene via the 1,2-shift of the hydride ligand from Os to the carbyne carbon,which was then further facilitated by the coordination of a third less bulky Ph2PC≡CPh ligand to the osmium center to give the stable 18e product 5.

Key words: osmium, carbyne, carbene, diphenyl(phenylethynyl) phosphine, propargyl chloride