Carbonylation ligands and their use in the carbonylation of ethylenically unsaturated compounds
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United States of America Patent
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Nov 7, 2017
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Nov 27, 2007
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Dec 2, 2006
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Abstract
Novel bidentate ligands of general formula (I) are described. In formula (I), A and B each independently represent a linking group; and R represents a hydrocarbyl aromatic structure. The substituent(s) Yi on the aromatic structure together have a total number Σti of atoms other than hydrogen such that Σti is greater than or equal to 4, wherein ti represents the number of atoms other than hydrogen on a particular substituent Yi. i ranges from 1 to n; and n is the total number of substituent(s) Yi. The groups X1, X2, X3 and X4 are joined via tertiary carbon atoms to the respective atom Q2 or Q1. Q1 and Q2 each independently represent phosphorus, arsenic, or antimony. A catalyst system and a process for the carbonylation of ethylenically unsaturated compounds utilizing the catalyst system are also described.
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