262 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (9) Fox, C., et al., Modification of the water-holding capacity of callus by pretreatment with additives, I. Soc. Cosmet. Chem., 13, 263-79 (1962). (10) Barnett, G., in Balsam, M.S., and Sagarin, E., Cosmetics: Scien•ce and Technolog•l, 2nd Ed., Wiley Interscience, New York, 1972, p. 76. (11) Berube, G. R., et al., Measurement in vivo of transepidermal moisture loss, I. Soc. Cosme•. Chem. 22, 361-8 (1971). (12) Powers, D. H., and Fox, C., A study of the effect of cosmetic ingredients, creams and lotions on the rate of moisture loss from the skin, Proc. Sci. Sect. Toilet Goods Ass., 28, 21-6 (1957). (13) Unpublished results in the files of Warner-Lambert Co., Morris Plains, N.J.

I. Soc. Cosmet. Chem., 25, 263-269 (May 1974) Die Photochemie yon Sonnenschutzmitteln II. 17Iber die Photochemie yon Methyl-p-dimethylaminobenzoat C. D. M. TEN BERGE* und C. H. ?. BRUINS* Synopsis-Photochemistry of sunscreens. II. The photochemistry of methyl-p-dimethyl- aminobenzoate.-The isolation and identification of another two photochemical reaction products of METHYL-p-DIMETHYLAMINOBENZOATE are described, ULTRAVIO- LET IRRADIATION of this compound in 1,4-dioxane in the presence of oxygen yielded also METHYL-p-N-FORMYLAMINOBENZOATE and METHYL-p-AMINOBENZOATE. Isolation was achieved by means of gas chromatography. The two products were identi- fied by comparison of the IR, NMR, and mass spectra of the isolated and synthesized substances. For METHYL-p-(N-FOHMYL-N-METHYL)-AMINOBENZOATE, mentioned in a previous communication, a new synthesis is described. Vor kurzem berichteten wit fiber die Photo&ernie yon Methyl-p-di- methylamlnobenzoat (1). Wit fanden vor allern, dab bel UV-Bestrahlung yon Methyl-p-dimethylamlnobenzoat ,in 'sauerstoffgesiittigtem 1,4-Dioxan zwei photochemische Reakfionsprodukte entstehen, niimlich Methyl-p-N-rnethyl- aminobenzoat und Methy!-p-(N-formyl-N-rnethyl)-aminobenzoat (1). Wei- tere Untersuchungen haben gezeigt, dat• noch weiter zwei Produkte nachzu- wei, sen sind, Methyl-p-aminobenzoat und Methyl-p-N-formyl-arninobenzoat (s. Formelbilder). Das Gas-Chromatogramm zeigt aut•erdem einen kleinen x\ H/N••-O-CH3 Methyl-p-aminobenzoat / H-C II 0 o Methyl-p-N-formylaminobenzoat Laboratorium voor Farmaceutische en Analytische Chemie der Rijksuniversiteit• Dir, Prof, Dr. J. s. Faber, Antonius Deusinglaan 2, Groningen/Nederland. 263