Synthesis of dinuclear gold-(I), -(II), and -(III) complexes containing ylide ligands [(RO2C)CHPPh2CH(CO2R)]–(R = Me or Et) and trinuclear gold(I) complexes containing ylide ligands [(RO2C)CPPh2CH(CO2R)]2–(R = Me or Et)

Publisher Website
Google Scholar
Abstract
The complexes [Au2{µ-[CH(CO2R)]2PPh2}2][R = Me, (1a); or Et, (1b)] can be obtained by treating [Ag2{µ-[CH(CO2R)]2PPh2}2](R = Me or Et) with [AuCl(tht)](tht = tetrahydrothiophene)(1 : 2). Complexes (1a) and (1b) react with Cl2Iph or I2(1 : 1) to give gold(II) complexes [(AuX)2{µ-[CH(CO2R)]2PPh2}2][X = Cl, R = Me (2a) or Et (2b); X = I, R = Me (3a) or Et (3b)]. If an excess of Cl2 or I2(1 : 2) is used gold(III) complexes [(AuX2)2{µ-[CH(CO2Me)]2PPh2}2][X = Cl, (4) or I, (5)] can be obtained. The corresponding derivatives with R = Et could not be prepared under the same conditions because a mixture containing mainly the gold(II) complexes (2b) and (3b) is obtained Reaction of (4) with AgClO4(1 : 2) in acetonitrile and, after removal of AgCl and addition of L (1 : 2) gives the first reported cationic gold(II) complexes [(AuL)2{µ-[CH(CO2Me)]2PPh2}2][ClO4]2[L = pyridine. (6); 3-bromopyridine, (7); 4-cyanopyridine, (8); 2,4-dimethylpyridine, (9); PPh3, (10); or AsPh3, (11)]. The phosphonium salts [PPh2(CH2CO2R)2]ClO4, react with [Au(acac)L](acac = acetylacetonate)(1 : 4) to give [(AuL)2{µ-C(CO2R)PPh2CH(AuL)(CO2R)}]ClO4[L = PPh3, R = Me (12a) or Et (12b); L = PMe2Ph, R = Me (13); L = P(C6H4OMe-4)3, R = Et (14)].

This publication has 16 references indexed in Scilit: