A two step procedure as improved alternative to the cyclocarbonylation of allyl halides and acetylene derivatives mediated by Ni(CO)4
作者:F. Camps、J. Coll、A. Llebaria、J.M. Moretó
DOI:10.1016/s0040-4039(00)82199-1
日期:1988.1
by Pd(II) complexes, such as bis-acetonitrile palladium(II) bromide, followed by cyclocarbonylation of the resulting adducts with Ni(CO)4 in CH3CN containing precise amounts of CH3OH and Et3N is a better procedure than the direct cyclocarbonylation of these substrates mediated by Ni(CO)4 for preparation of cyclopentenones, specially for monosubstituted acetylenes or weakly polarized disubstituted acetylenes
在Pd(II)配合物(如双乙腈钯(II)溴化物)催化的炔属衍生物中添加烯丙基卤化物,然后在含精确量CH 3的CH 3 CN中用Ni(CO)4环化所得的加合物。OH和Et 3 N比由Ni(CO)4介导的这些底物进行直接环羰基化来制备环戊烯,特别是对于单取代的乙炔或弱极化的二取代的乙炔而言,是一种更好的方法。