SYNTHESIS AND CHARACTERIZATION OF ENYNYL, VINYL AND ACETYLIDE COMPLEXES OF OSMIUM(II)

Citation
G. Albertin et al., SYNTHESIS AND CHARACTERIZATION OF ENYNYL, VINYL AND ACETYLIDE COMPLEXES OF OSMIUM(II), Journal of the Chemical Society. Dalton transactions, (5), 1995, pp. 719-725
Citations number
58
Categorie Soggetti
Chemistry Inorganic & Nuclear
ISSN journal
03009246
Issue
5
Year of publication
1995
Pages
719 - 725
Database
ISI
SICI code
0300-9246(1995):5<719:SACOEV>2.0.ZU;2-H
Abstract
Treatment of [OsH(2)L(4)] [L = P(OEt)(3) or PPh(OEt)(2)] first with CF (3)SO(3)Me and then with an excess of terminal alkynes RC-CM (R = Bu(t ), Ph or p-MeC(6)H(4)) produced enynyl derivatives [Os{eta(3)-RC(3)C(H )R}L(4)](+) 1-3. Sequential reactions of [OsH(2)L(4)] with CF(3)SO(3)M e and activated alkynes R'O2CC=CH (R' = Me or Et) or MeO(2)CC=CCO(2)Me yielded alkenyl [Os{CH=C(H)CO(2)R')L(4)](+) 4,5 and [Os{C(CO(2)Me)=C( H)CO2- Me}L(4)](+) 6 cations, respectively. Spectroscopic data (IR, H- 1, P-31, C-13 NMR) suggest, in the case of L = P(OEt)(3), the presence of two isomers for the alkenyls 4 and 5, with five- and four-membered , chelate rings of the vinyl ligand. Hydride-alkynyl [OsH(C=CPh)L(4)] complexes were also obtained by treating[OsH(2)L(4)] with CF(3)SO(3)Me followed by treatment with lithium phenylacetylide.