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Novel (N‐heterocyclic carbene)Pd(pyridine)Br 2 complexes for carbonylative Sonogashira coupling reactions: Catalytic efficiency and scope for arylalkynes, alkylalkynes and dialkynes
Author(s) -
Ibrahim Mansur,
Malik Imran,
Mansour Waseem,
Sharif Muhammad,
Fettouhi Mohammed,
El Ali Bassam
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4280
Subject(s) - chemistry , carbene , sonogashira coupling , pyridine , aryl , palladium , catalysis , medicinal chemistry , bromide , carbonylation , combinatorial chemistry , polymer chemistry , organic chemistry , carbon monoxide , alkyl
New N , N ′‐substituted imidazolium salts and their corresponding dibromidopyridine–palladium(II) complexes were successfully synthesized and characterized. Reactions of palladium bromide with the newly synthesized N , N ′‐substituted imidazolium bromides ( 2a and 2b ) in pyridine afforded the corresponding new N‐heterocyclic carbene pyridine palladium(II) complexes ( 3a and 3b ) in high yields. Their single‐crystal X‐ray structures show a distorted square planar geometry with the carbene and pyridine ligands in trans position. Both complexes show a high catalytic activity in carbonylative Sonogashira coupling reactions of aryl iodides and aryl diiodides with arylalkynes, alkylalkynes and dialkynes.