These alkenylamines were prepared by the Grignard reaction of 4-bromo-1-butene with the appropriate aldehydes, followed by the oxidation of the resulting alcohols with pyridinium chlorochromate to the corresponding ketones, the transformation of the ketones into the N-methylimines, and the reduction of the imines with sodium borohydride. A commercially available 5-hexen-2-one was used for the preparation of 1d. 1a: bp 123–126°C (16 mm Hg); 1b: bp 77–78°C (0.7 ...
