(untitled) - Fandrick, D R; Hart, C A; Okafor, I S; Mercadante, M A; Sanyal, S; Masters, J T; Sarvestani, M; Fandrick, K R; Stockdill, J L; Grinberg, N; Gonnella, N; Lee, H; Senanayake, C H (Org. Lett., 2016)
The propensity of alicyclic imines such as 1-pyrroline and 1-piperideine to undergo the formation of more stable and typically unreactive trimers is well documented. For a leading study, see: