Synthesis of palladium–biscarbene complexes derived from 1,1′-methylenebis(1,2,4-triazole) functionalized in the methylene bridge

摘要: Abstract Palladium–biscarbene complexes derived from N , ′-bis(1,2,4-triazol-1-yl)methane, which bear an alkyl chain functionalized with a hydroxyl group, have been synthesized ([Pd(L1)Br 2 ] ( 6 ) and [Pd(L1)I 7 [L1 = 1,1′-(3-hydroxypropylidene)bis(4-butyl-4,5-dihydro-1 H -1,2,4-triazol-5-ylidene)]). Each product is obtained as non-equimolecular mixture of two conformers. The group has replaced by bromide methanesulphonate [Pd(L2)Br [L2 = 1,1′-(3-bromopropylidene)bis(4-butyl-4,5-dihydro-1 -1,2,4-triazol-5-ylidene)] 9 )) ([Pd(L3)Br [L3 = 1,1′-(3-methanesulphonyloxypropylidene)-bis(4-butyl-4,5-dihydro-1 10 were obtained, respectively, mixtures All compounds consist six-membered metallacyclic structure in boat conformation. Major conformers present the axial position, while minor it located equatorial position.