1. For a review of the discovery of the Perkin condensation and related reactions, see J. R. Johnson, Org. React., 1942, 1, 210. The reader is also referred to this review for more detailed discussions of the work as well as a greater number of examples published in this area prior to ca. 1940.
2. XXIII.—On the hydride of aceto-salicyl
3. Ueber Phenylglycidasäure (Phenyloxacrylsäure)