FIELD: chemistry.
SUBSTANCE: present invention relates to ligands used in transition metal based catalysts for hydroformylation, isomerisation-hydroformylation, hydrocarboxylation, hydrocyanation, isomerisation-formylation, hydroaminomethylation and related reactions, of formula: 
, where i, j, k, l, m and n are H, R, Ar, substituted Ar, OR, OAr, COOEt, halogen, SO2R, SO3H, SO2NHR, POR2, POAr2 or NR2, where R is optionally substituted alkyl or aryl, Ar is aryl; X1-X4 are O or CH2; and Y1, Y'1 Y2, Y'2, Y3, Y'3, Y4, Y'4 are R, Ar, OR, OAr, pyrrole and substituted pyrrole are bonded through a carbon-carbon bond, CH2, NH, NR or O.
EFFECT: obtaining novel efficient catalysts.
14 cl, 1 ex, 11 tbl
