Patent ID: 8680274

Claim:
An organometallic complex comprising a metal atom selected from groups 1-16 of the periodic table and a C—C—C bent allene two- to four-electron-donating ligand having the formula: wherein each of R a , R b , R c and R d are independently selected from the group consisting of hydrogen, C 1-10 alkyl, C 3-10 cycloalkyl, C 2-10 alkenyl, C 3-10 cycloalkenyl, C 2-10 alkynyl, C 2-10 alkoxycarbonyl, C 1-10 alkylsulfonyl, C 1-10 alkylsulfinyl, aryl-C 1-4 alkyl and heteroaryl-C 1-4 alkyl; and each R e is a substituent independently selected from the group consisting of halogen, cyano, nitro, C 1-4 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 alkoxy, C 2-6 alkenyloxy, C 2-6 alkynyloxy, C 2-6 alkoxycarbonyl, C 1-6 alkylthio, C 1-6 alkylsulfonyl, C 1-6 alkylsulfinyl, primary amino, carboxyl, C 1-6 alkylamino, C 1-6 dialkylamino, amido, hydroxy and thiol groups.