FIELD: chemistry.
SUBSTANCE: catalyst system is described. It consists of compounds with general formula I 
or its salt, bonded to a VIIIB metal, where A1 and A2, as well as A3, A4 and A5 (when present), K, D, E, X1-X4, Q1, Q2, M, L1 assume values given in the formula of invention.
EFFECT: system is suitable for carbonylation of ethenoid unsaturated compounds.
45 cl, 32 ex, 9 tbl
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