Studies of electrophilic additions to acetylenic systems have been few in comparison to the studies of olefinic systems. In spite of the obvious structural analogies between double and triple carbon-carbon bonds, triple bonds are less reactive toward electrophilic reagents than double bonds by as much as a factor lo5. This is due to the differential ease of formation of carbonium ions and vinyl cations under the conditions of electrophilic addition.'It has been ...
