Copolymerization of amino olefins with ethylene by dinickel bisphenoxyiminato complexes

Abstract

Dinickel bisphenoxyiminato complexes based on 1,4 and 1,3 terphenyl backbones were synthesized. Substitution of the central arene ortho to the side aryl moieties allowed isolation of syn and anti atropisomers. The syn atropisomers of the reported complexes afforded copolymn. of amino olefins with ethylene in the presence of a phosphine scavenger (Ni(COD)_2). The ability of the syn atropisomers of these complexes to incorporate unprotected amino olefins by insertion polymn. was investigated by comparisons of the syn and anti atropisomers, and the 1,3 and 1,4 terphenyl systems. Further insight regarding the mechanism of polymn. with the reported complexes was obtained by copolymns. of ethylene and 1-hexene in the presence of a variety of non-olefinic amines.

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