Jump to main content
Jump to site search

Issue 1, 1991
Previous Article Next Article

Preparation and carbonyl-substitution reactions of hexacarbonyldicobalt-complexed 1,3-dioxa-2-silacyclohept-5-ynes and 1,3,8,10-tetraoxa-2,9-disilacyclotetradeca-5,12-diynes. X-Ray crystal structure of [(Ph3P)(OC)5Co2-{µ-(C2CH2OSiPh2OCH2)2}Co2(CO)5(PPh3)]

Abstract

Reactions between [Co2(µ-HOCH2C2CH2OH)L1L2(CO)4][L1= L2= CO or L1–L2= bis(diphenyl-phosphino)methane (dppm)] and SiR1(R2)Cl2(R1= R2= Me or Ph; R1= Me, R2= Ph) afford hexacarbonyldicobalt-complexed 1,3-dioxa-2-silacyclohept-5-ynes which undergo carbonyl substitution in the case of L1= L2= CO with PPh3 or dppm. Fast-atom-bombardment (FAB) mass spectral evidence indicates that the 2,2-diphenyl-1,3-dioxa-2-silacyclohept-5-yne complex and its monophosphine-substituted derivative are dimers which is confirmed by the X-ray crystal structure of the latter, [(Ph3P)(OC)5Co2{µ-(C2CH2OSiPh2OCH2)2}Co2(CO)5(PPh3)], in which the phosphine ligands occupy axial positions on opposite sides of the fourteen-membered ring. Only monomers are identified in the mass spectra of the other compounds, but evidence for unseparated higher oligomers as minor products is found in the NMR spectra of the 2,2-dimethyl-1,3-dioxa-2-silacyclohept-5-yne complex and its monophosphine and dppm derivatives.

Back to tab navigation

Article information


J. Chem. Soc., Dalton Trans., 1991, 137-142
Article type
Paper

Preparation and carbonyl-substitution reactions of hexacarbonyldicobalt-complexed 1,3-dioxa-2-silacyclohept-5-ynes and 1,3,8,10-tetraoxa-2,9-disilacyclotetradeca-5,12-diynes. X-Ray crystal structure of [(Ph3P)(OC)5Co2-{µ-(C2CH2OSiPh2OCH2)2}Co2(CO)5(PPh3)]

R. H. Cragg, J. C. Jeffery and M. J. Went, J. Chem. Soc., Dalton Trans., 1991, 137
DOI: 10.1039/DT9910000137

Search articles by author

Spotlight

Advertisements