中文摘要：

简单的锇起始物OsHCl（PPh3）3（1）或OsCl2（PPh3）3（2）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OsHCl_2（≡CCH=CMe_2）（PPh3）2（3）和OsCl3（≡CCH=CMe_2）（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）3（5）,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）2（6）.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.

英文摘要：

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 Ph_2PC≡CPh led to the formation of the tris-diphenyl（phenylethynyl）phosphine alkenylcarbene complex OsCl_2（=CHCH=CMe2）（Ph2PC≡CPh）3（5）,while complex 4 underwent simple phosphine ligand substitution with Ph2PC≡CPh to give OsCl3（≡CCH=CMe_2）（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 18 e product 5.