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NOVEL CARBONYLATION LIGANDS AND THEIR USE IN THE CARBONYLATION OF ETHYLENICALLY UNSATURATED COMPOUNDS
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Page/Page column 72-73, (2008/12/06)
Novel bidentate ligands of general formula (I) are described Formula (I): R represents a hydrocarbyl aromatic structure. The substituent(s) Yx on the aromatic structure has a total X=1-n ΣtYx of atoms other than hydrogen such that x-1-nΣtYx is ≥ 4, where n is the total number of substituent(s) Yx and tYx represents the total number of atoms other than hydrogen on a particular substituent Yx. The groups X1, X2, X3 and X4 are joined to Q1 or Q2 via tertiary carbon atoms to the respective atom Q1 or Q2; and Q1 and Q2 each independently represent phosphorus, arsenic or antimony. A catalyst system and a process for the carbonylation of ethylenically unsaturated compounds utilising the catalyst system is also described.
