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Pd and Ni complexes of a novel vinylidene β‐diketimine ligand: Their application as catalysts in Heck coupling and alkyne trimerization
Author(s) -
Beesam Raghavendra,
Nareddula Dastagiri Reddy
Publication year - 2017
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.3696
Subject(s) - chemistry , alkyne , catalysis , ligand (biochemistry) , heck reaction , medicinal chemistry , ether , palladium , polymer chemistry , stereochemistry , organic chemistry , biochemistry , receptor
A β‐diketimine ligand with vinylidene substitution at γ‐carbon, CH 2 C(CH 3 CNAr) 2 (Ar = 2,6‐diisopropylphenyl) ( L 2 ), was synthesized by treating β‐diketimine H 2 C(CH 3 CNAr) 2 with n ‐BuLi followed by paraformaldehyde. L 2 formed the homobimetallic ether‐bridged β‐diketiminate complex [O{(CH 2 ‐β‐diketiminate)Pd(OAc)} 2 ] ( 1 ) with (PdOAc) 2 . It also gave complexes [L 2 PdCl 2 ] ( 2 ) and [L 2 NiBr 2 ] ( 3 ) when treated with PdCl 2 (CH 3 CN) 2 and NiBr 2 (dimethoxyethane), respectively. All the compounds were characterized using 1 H/ 13 C NMR spectroscopy and single‐crystal X‐ray diffraction studies. The catalytic activity of Pd and Ni complexes 1 , 2 and 3 was explored in Heck coupling and alkyne trimerization reactions and it was found that they are very good catalysts. The results are reported in detail.