Free Access
Issue
J. Chim. Phys.
Volume 95, Number 2, February 1998
Page(s) 388 - 394
DOI https://doi.org/10.1051/jcp:1998149
DOI: 10.1051/jcp:1998149


J. Chim. Phys. Vol. 95, N°2  p. 388-394

Photoisomerisation of the sunscreen filter PARSOL © 1789

M. Dubois, P. Gilard, P. Tiercet, A. Deflandre and M.A. Lefebvre

L'OREAL, Laboratoires de Recherche Avancée, Direction des Sciences de la Matière, 1 avenue Eugène Schueller, 93601 Aulnay-sous-Bois, France

Abstract
PARSOL © 1789 exists in solution in three tautomeric forms: two cis-enols and a $\beta$-diketone. The enol forms predominate. Irradiation of a very dilute solution of PARSOL © 1789 in acetonotrile with a Xenon lamp increases the percentage of $\beta$-diketone to become the predominant form present. This photoisomerisation has been studied by means of 1H and 13C NMR.

Résumé
Le PARSOL (*) 1789 existe en solution sous trois formes tautomères : deux cis-énols et une $\beta$-dicétone. Les formes énoliques prédominent. L'irradiation du PARSOL (*) 1789 avec une lampe Xénon en solution très diluée dans l'acétonitrile augmente le pourcentage de $\beta$-dicétone qui devient la forme prédominante. Cette photoisomérisation a été étudié en RMN 1H et 13C.


Key words: sunscreen -- $\beta$-diketone -- enol -- tautomerism -- NMR
Contents

© EDP Sciences 1998

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.