Long range carbon—carbon coupling in olefins. 4-13C-4-propyl-3-heptene and 1-13C-1-methylcyclohexene

All ¹³C—¹³C splittings involving the C-4 carbon of 4-propyl-3-heptene and the C-1 carbon of 1-methylcyclohexene were determined from the appropriately labeled (> 90%-¹³C) derivatives. The observed trends in coupling constants continue to offer additional means of carbon chemical shift assignments and to provide mechanistic information regarding the nature of long range carbon—carbon coupling.