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.
本发明涉及一种一般式(I)的新型双齿
配体,以及一种用于羰基化
乙烯基不饱和化合物的方法。其中,基团X1可以定义为具有最多30个原子的一价烃基基团,其中至少含有一个
氮原子,在18℃下的稀溶液中pKb值在4到14之间,且所述至少一个
氮原子与Q2原子之间相隔1到3个
碳原子。基团X2被定义为X1、X3或X4,或表示具有至少一个一级、二级或芳香环
碳原子的最多30个原子的一价基团,其中每个所述一价基团分别通过所述至少一个一级、二级或芳香环
碳原子与相应的Q2原子连接。Q1和Q2各自独立地表示
磷、
砷或
锑。