On the mechanism of the silicon-tethered reductive Pauson–Khand reaction
作者:John F Reichwein、Scott T Iacono、Brian L Pagenkopf
DOI:10.1016/s0040-4020(02)00337-x
日期:2002.5
The reductive Pauson–Khand reaction (PKR) of tethered vinyl silanes likely proceeds as usual to the bicyclopentenones 2, but rapid loss of the allylic silane initiates a fragmentation process culminating in propargylic carbon reduction. Damp nitrile solvents are crucial for efficient reaction, and under dry conditions additional products are obtained including dimerized cyclopentadienones and 5-(1-amino-alkylidine)
Cyclocarbonylation of silicon tethered enynes derived from propargylic alcohols and vinylsilanes: a new reductive Pauson–Khand reaction with a traceless tether
作者:John F. Reichwein、Scott T. Iacono、Mittun C. Patel、Brian L. Pagenkopf
DOI:10.1016/s0040-4039(02)00634-2
日期:2002.5
In nitrile solvents vinylsilyl ethers of propargylic alcohols undergo Pauson–Khand reaction with polysiloxane extrusion and concomitant reduction of the propargylic CO bond. The product enones are formally the result of an intermolecular PKR reaction with ethylene.