E. Lippmann et al., SYNTHESIS AND STRUCTURE OF A STABLE 16-EL ECTRON GAMMA-ACYLESTER ENOLATE IRIDIUM(III) COMPLEX (CL)(PH3P2)(IR-C(O)CH=C(OET)O)OVER-BAR, Journal of organometallic chemistry, 479(1-2), 1994, pp. 221-225
Elimination of HCl from the six-coordinated complex Cl2(Ph3P)2Ir-C(O)C
HC(OEt)O gives the five-coordinated alpha-acyl ester enolate complex (
CI)(Ph3P)2Ir-C(O)CH=C(OEt)O (1). The X-ray diffraction for 1 shows a d
istorted tetragonal pyramidal structure with the acyl group in the api
cal position. The 16-electron complex 1 adds CO and CH3CN in a reversi
ble manner.