Studies on some stereoisomeric unsaturated substances

Abstract

Introduction. • • Theoretical Part. • • Experimental Part. I. Preparation of chloropiperonyldesoxybenzoin. • Preparation of the two piperonylidenedesoxyrbenzoins. • Transformations of the two piperonylidenedesoaybenzoíns into one another. • Behaviour of chloropiperonyldesoxybenzoin towards methyl and ethyl alcohols. • • II. Condensation of desoxybenzoin and o. nitrobenzaldehyde • Transforrnations of the two o. nitrobenzaldesoxybenzoins into one another. • Addition of desoxybenzoin to the two o. nitrobenzaldesoxybenzoins. • • III. Condensation of Desoxybenzoin and rn. nitrobenzaldehyde. Preparation of the three m. nitrobenzaldesoxy benzoins. • Melting- points of mixtures of the three n. nitrobenzaldesoxybenzoins. • Transformations of the three M. nitrobenzaldesoxybenzoins into one another. • Addition of desoxybenzoin to the three m. nitrobenzaldesoxybenzoins. • Addition of bromine to the three m. nitrobenzaldesoxybenzoins . • •

IV. Condensation of desoxybenzcin and p. nítrobenzaldehyde. • Action of caustic potash on chloro- p.. nitrobenzyld, esoxrhenzoin. • Transformations of the three p. nitrobenzaldesoxybenzoins into one another. • Melting points of mixtures of the three p. nitrobenzaldiesoxybenzoins. • "Seedíng" experiments with supersaturated solutions of the three p. nitrobenzaldesoxybanzol.ns and with the fused substances. • Addition of desoxybenzoin to the three p. nitrobenzaldesoxybenzolns. • • V. Condensation of acetophenone and o. methoxybenzaldehyde • Attempts to obtain a stereoisomeric o. methoxybenzalacetophenone • • VI. Transformations of the two stereoisomeric piperonylideneacetones • • VII. Attempt to convert piperonylideneacetophenone into a stereoisomer • • VIII. Attempts to prepare a stereoisomer of anisylideneacetone. • • IX. Attempts to transform anisylídeneacetophenone into a stereoisomer.