Bidentate ligands for the carbonylation of unsaturated...

Details Bidentate ligands for the carbonylation of unsaturated... Bidentate ligands for the carbonylation of unsaturated...

2006-11-14

2006-11-14

Truong, Duc (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S322000, C528S392000, C528S398000

Reexamination Certificate

active

07135542

ABSTRACT:
Bidentate ligand of formula (I), R1R2M1-R-M2R3R4wherein M1and M2each indenpendently represent P, As or Sb; R1, R2, R3and R4each independently represent the same or a different optionally substituted organic group and at least one of R1, R2, R3and R4contains a tertiary carbon atom through which the group is linked to M1or M2; and R represents a bridging group based on a trimethylene group connecting M1and M2of 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.

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