A series of mono-and diterpenylalkanolamines bearing isopropylidene functionality on the terpene group was reacted with sodium nitrite in aqueous acetic acid to yield ethylidyne N- nitroso analogues. The key feature of thie direct conversion involved intial N-nitrosation followed by apparent elimination of a “CHI” unit (not necessarily methane) from the isopropylidene double bond.“he product distribution data for ethylidyne nitrosamines ...