9-Demethyl-9-haloretinals by Wadsworth−Emmons Coupling− Easy Preparation of Pure (all-E), (9Z) and (11Z) Isomers
作者:Yajie Wang、Wei Sein Woo、Ineke van der Hoef、Johan Lugtenburg
DOI:10.1002/ejoc.200400005
日期:2004.5
quantitative yield as a mixture of (9Z) and (all-E) isomers. Even the corresponding fluoro derivative could be obtained in good yield as (9Z) and (all-E) isomers. In the case of a double bond having a halogen substituent, the IUPAC rules have the (E) nomenclature for a cis double bond and the (Z) for a trans double bond. Simple column chromatography gave the pure (9Z) and (all-E) form. Optimizing the Wadsworth−Emmons
Synthesis of ionones and carvone analogues: olfactory properties and preliminary toxicity assays
作者:M Anzaldi
DOI:10.1016/s0223-5234(00)00181-1
日期:2000.9
Vilsmeier reagents react with alpha/beta-ionones and carvone to produce aldehydes 7-11 in a one-step procedure. The indene derivative 11, which came from the double iminoalkylation of carvone and ring closure with the elimination of dimethylamine, was practically odourless, while all the others had peculiar odours which were very different from the starting material. The cytotoxicity data of 9 and 10, which are the most promising potential perfume ingredients, are also reported. (C) 2000 Editions scientifiques et medicales Elsevier SAS.