Binuclear complexes of nickel bridged by hydrocarbon ligands. Isocyanide insertion chemistry and amide formation by intramolecular coupling of acyl and imidoyl functionalities
作者:Juan Campora、Ernesto Carmona、Enrique Gutierrez、Pilar Palma、Manuel L. Poveda、Caridad Ruiz
DOI:10.1021/om00037a006
日期:1992.1
Ni(cod)(PMe3)2 and the o-, m-, and p-bromobenzyl bromides react, under appropriate conditions, to afford the binuclear complexes Ni2(mu(2)-eta(3),eta(1)-CH2C6H4)Br2(PMe3)3 (1a-c) or Ni2(mu(2)-eta(1),eta(1)-CH2C6H4)Br2(PMe3)4 (2b,c). The reaction of the ortho eta(3)-benzylic derivative 1a with isocyanides, CNR, has been investigated, and three different isomeric species have been identified for R = Bu(t). The CNC6H3-2,6-Me2 insertion product, 4, reacts with CO to form a Ni(II)-vinyl complex 7 derived from the N-aryl-1-isoquinolone 8, which can be freed by hydrolytic cleavage of the Ni-vinyl bond.