SYNTHESIS AND REACTIVITY OF CP-ASTERISK-RU-II ETA(6)-PI-ADDUCTS OF FUNCTIONALIZED ARENES WITH USEFUL SIDE-CHAINS - X-RAY MOLECULAR-STRUCTURE OF [CP-ASTERISK-RU(ETA(6)-N-SUCCINIMIDYL 3-(4-METHOXYPHENYL)PROPIONATE)][CF3SO3]

Several novel organoruthenium complexes [CpRu(eta(6)-arene)][CF3SO3] (3, 4, 6) were prepared in which the arene unit possesses an alkyl cha in terminated with carboxylic acid, ester, and activated ester functio ns. These compounds were fully characterized by spectroscopic methods, and in particular, the activated ester complex [CpRu(eta(6)-MeOC(6)H (4)(CH2)(2)COONS)][CF3SO3] (6) (NS = N-succinimidyl) was identified by X-ray analysis. The reactivity of 6 with respect to benzylamine and b eta-alanine ethyl ester was examined and afforded quantitatively the s table conjugates u(eta(6)-MeOC(6)H(4)CH(2)CH(2)CONHCH(2)Ph][CF3SO3] (7 ) and a(6)-MeOC(6)H(4)(CH2)(2)CONH(CH2)(2)COOEt][CF3SO3] (8). Furtherm ore, the stability and reactivity of 6 relative to the analogous dicat ionic organoiridium complex [CpIr(eta(6)-MeOC(6)H(4)(CH2)(2)COONS)][B F4](2) (10) and the neutral metallocarbonyl derivatives of the type [L (n)MCpCOONS] (12-14) [L(n)M = Fe(CO)(2)Me, Mo(CO)(3)Me, Co(CO)(2)] are presented and discussed.