作者:Marie E. Krafft、Carmelinda A. Juliano、Ian L. Scott、Colin Wright、Michael D. McEachin
DOI:10.1021/ja00005a038
日期:1991.2
The regioselectivity of the cobalt-mediated cocyclization of an alkene, an alkyne, and carbon monoxide has been shown to be directed by the use of a soft atom, either sulfur or nitrogen, tethered to the alkene partner by a carbon chain. Direction from the homoallylic position is more efficient thant from the allylic or bishomoallylic position. A rationale is proposed to explain this observation. Studies
Steric control in the pauson cycloaddition: Further support for the proposed mechanism
作者:Marie E. Krafft
DOI:10.1016/0040-4039(88)85318-8
日期:1988.1
Dicobalthexacarbonyl complexes of internal alkynes react with olefins to give cyclopentenones with a high degree of regiocontrol. Analogous reactions of terminal alkynes give rise to regioisomeric mixtures of cyclopentenones.