Oligomers of allene. Part II. Dimers and trimers formed in the thermal polymerisation of liquid allene
Abstract
Thermal polymerisation of liquid allene affords two dimers, 1,2-dimethylenecyclobutane and 1,3-dimethylene-cyclobutane, as well as three trimers, 1,5(and/or 1,6)-dimethylenespiro[3,3]heptane, 1,2,4-trimethylenecyclohexane and 3-methylenebicyclo[4,2,0]octa-1(6)-ene. A radical mechanism is proposed.