Multiple substitutions on (η6-arene)tricarbonylchromium(0) complexes

摘要

The treatment of representative (η6-arene)tricarbonylchromium(0) complexes 1a–c and 4 with 3 equivalents ofnLiTMP followed by an electrophilic quench with Me3SiCl provided a series of trisilylated complexes 2a–c and 5a. Thenuse of Me3SnCl and Ph2PCl as electrophile also yielded unusual trisubstituted complexes 13a and 13b. The X-rayncrystallographic structure of complex 13b is reported. Deuteration studies using deuteroacetic acid as the electrophilenled to the observation of a trideuterated species presumably derived from a trianionic species formed during thenreaction. Efficient disubstitution was observed when complexes 7, 9 and 11 were treated with 3 equivalents of LDAnfollowed by an electrophilic quench with Me3SiCl