3-Alkyl-N-(~-hydroxyethyltl, 1-dialkyl-2-propynylamines (VII), when treated with potassium hydroxide in an inert solvent, cyclized to 2, 3, 4, 5-tetrahydro-l, 4oxazepines (VIII). Hydrogenation of VI11 gave the hexahydro-1, 4oxazepines (XII). When the 3-substituent was chloro, phenyl, or methylthio, VI1 cyclized to a Zmethylene morpholine XIII. The 3- pyrrolidinomethyl derivative VIIf gave a corresponding%(Z-pyrrolidinoethylidene)- ...