申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0254343A1
公开(公告)日:1988-01-27
1. Novel catalyst compositions characterized in that they are based upon:
a) a palladium compound,
b) a quaternary phosphonium salt of an acid with a pKa of less than 2, with the proviso that the acid is not a hydrohalogenic acid or a mixture of such a salt and acid, and
c) either a phosphorus bidentate ligand of the general formula R¹R²-P-R-P-R³R⁴, wherein R¹, R², R³ and R⁴ are hydrocarbyl groups which may or may not be substituted with polar groups and R represents a bivalent organic bridging group containing at least two carbon atoms in the bridge, or a nitrogen bidentate ligand of the general formula
wherein X and Y are similar or dissimilar bridging groups, each containing three or four atoms in the bridge at least two of which are carbon atoms.
1.新型催化剂组合物,其特征在于:
a) 钯化合物、
b) 一种 pKa 小于 2 的酸的季鏻盐,但该酸不是氢卤酸或这种盐和酸的混合物,以及
c) 通式为 R¹R²-P-R-P-R³R⁴的磷双叉配体,其中 R¹、R²、R³ 和 R⁴ 为可能被或可能不被极性基团取代的烃基,R 代表桥中至少含有两个碳原子的二价有机桥基,或通式为氮双叉配体。
其中 X 和 Y 是相似或不相似的桥基,每个桥基含有三个或四个原子,其中至少两个是碳原子。