Chlorophyll and Related Substances. Part III.* The Synthesis of Octamethylchlmin.

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The effects of basic catalysts and temperature on the condensations of benzaldehyde with N‐methyldiacetimide, N‐phenyldiacetimide, N,N‐dimethylacetamide and N,N‐diphenylacetamide respectively have been studied. These condensations have little practical value but the isolation of N‐cinnamoyl acetanilide from the reaction between benzaldehyde and N‐phenyldiacetimide proves that dehydration precedes deacylation during the Perkin reaction involving tertiary amides.

Further proofs are adduced in favour of the theory of add catalyzed acylation of amides to diacylamines. Synthetic examples are given partly as improvements of older methods, partly as illustrations of the theory. The preparation of the following new compounds is described: N‐isobutyrylbenzamide, N‐acetyl‐n‐butyramide, N‐methyldipropionimide and N‐methyldi‐n‐butyrimide.