NEW BIDENTATE LIGANDS, CATALYST COMPRISING SUCH BIDENTATE LIGANDSAND PROCESS FOR THE CARBONYLATION OF ETHYLENCALLY OR ACETYLENICALLY UNSATURATED COMPOUNDS USING SUCH A CATALYST

摘要

Bidentate ligand of formula (I), R<1>R<2>M<1>-R-M<2>R<3>R<4> wherein M<1> and M<2> each indenpendently represent P, As or Sb; R<1>, R<2>, R<3> and R<4> each independently represent the same or a different optionally substituted organic group and at least one of R<1>, R<2>, R<3> and R<4> contains a tertiary carbon atom through which the group is linked to M<1> or M<2>; and R represents a bridging group based on a trimethylene group connecting M<1> and M<2> of which the middle carbon atom is double bonded to a non-metal element chosen from group 14, 15 or 16 of the periodic table of elements. Catalyst comprising this bidentate ligand and carbonylation process n which this catalyst is used.