Synthetische und isolierte Riechstoffe und ihre Herstellung

Abstract

IN the new edition of this book the author has maintained the general plan of the original, but the process of revision has necessarily entailed a considerable expansion of certain sections. The descriptions of apparatus and plant used in isolating and synthesising perfumes and their components form a particularly useful feature of the work; the general treatment is here supplemented by particular references to the manufacture of important specific substances, such as phenylethyl alcohol, cinnamic acid, salicylaldehyde, piperonal, and synthetic musk. The descriptions of quantitative determinations and of individual substances, although brief, are on the whole adequate for the purpose in view. This section of the book, however, cannot be exonerated from sins both of omission and commission: for example, the account of synthetic menthol is restricted to a mention of the reduction of menthone and pulegone with an excess of nascent hydrogen; and it is incorrectly stated (p. 82) that d-menthone, like Z-menthone, yields a mixture of Z-menthol and d-isomenthol when treated in this way. It need scarcely be pointed out, moreover, that Z-menthone is not converted to d-menthone when treated with sulphuric acid, “nach der Inversionsmethode von Beckmann” (p. 164).

Synthetische und isolierte Riechstoffe und ihre Herstellung

Von Dr. Rudolf Knoll. (Monographien öber chemisch-technische Fabrikationsmethoden, herausgegeben von L. Max Wohlgemuth, Band 10.) Zweite, vollstondig neu bearbeitete und erweiterte Auflage, von Alfred Wagner. Pp. viii + 257. (Halle a. Saale: Wilhelm Knapp, 1928.) 14.50 gold marks.