A novel bidentate ligand of general formula (I) is described together with a process for the carbonylation of ethylenically unsaturated compounds. The group X
1
may be defined as a univalent hydrocarbyl radical of up to 30 atoms containing at least one nitrogen atom having a pKb in dilute aqueous solution at 18° C. of between 4 and 14 wherein the said at least one nitrogen atom is separated from the Q
2
atom by between 1 and 3 carbon atoms. The group X
2
is defined as X
1
, X
3
or X
4
or represents a univalent radical of up to 30 atoms having at least one primary, secondary or aromatic ring carbon atom wherein each said univalent radical is joined via said at least one primary, secondary or aromatic ring carbon atom(s) respectively to the respective atom Q
2
. Q
1
and Q
2
each independently represent phosphorus, arsenic or antimony.
通用公式(I)的一种新的双齿
配体及其用于
乙烯基不饱和化合物羰基化的方法被描述。基团X1可以被定义为一个最多含有30个原子的一价烃基基团,其中至少含有一个
氮原子,在18°C时在稀溶液中的pKb值在4和14之间,其中所述至少一个
氮原子与Q2原子之间由1至3个
碳原子分隔。基团X2被定义为X1、X3或X4,或者代表一个最多含有30个原子的一价基团,其中至少含有一个主要、次要或芳香环
碳原子,其中每个所述一价基团分别通过所述至少一个主要、次要或芳香环
碳原子连接到相应的Q2原子。Q1和Q2各自独立地代表
磷、
砷或
锑。