The pyrrolidine (6) obtained in experiment 2 could be prepared, in 90% yield, also by treatment of one mol of the azomethine N-benzylidenebenzylamine in THF at 20°C with one mol of 2-methylbutadiene and a catalytic amount (0.05 mol) of lithium pyrrolidide. Apparently the lithium pyrrolidide formed in the addition process is able to metalate the azomethine smoothly. This base-catalyzed union of an azomethine (10) and an alkene, which is presumably not restricted to the special system discussed here, may lead to an industrially interesting process. Z
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