An efficient, one-pot methodology of direct synthesis of perylene-fused cyclicketones from perylene and 2-alkenoic acids under acidic catalytic conditions has been developed. The reaction of perylene with 2,3-disubstituted 2-alkenoic acid leads, via Friedel–Crafts acylation followed by Nazarov cyclization, to the formation of disubstituted 5,6-dihydro-4H-cyclopenta[b]perylen-4-ones in high yield (up
Synthesis of 2-Hydroxy-3-oxocarboxylic Esters From the Corresponding α,β-Unsaturated Esters by a Simple One-Step Procedure
作者:D. H. G. Crout、D. L. Rathbone
DOI:10.1055/s-1989-27142
日期:——
A convenient one-step synthesis of 2-alkyl-2-hydroxy-3-oxocarboxylic esters by potassium permanganate oxidation of the corresponding readily available α,β-unsaturated esters is described. Preparation of the latter by the phosphonate modification of the Wittig reaction is also reported.
AGENTS AND METHODS FOR THE TEMPORARY SHAPING OF KERATIN-CONTAINING FIBERS
申请人:HENKEL AG & CO. KGAA
公开号:US20170340547A1
公开(公告)日:2017-11-30
The disclosure relates to a cosmetic product, comprising a) a cosmetic preparation, containing, in relation to its total weight, a
1
) 60 to 98 wt. % of at least one polar solvent; a2) 0.1 to 20 wt. % of at least one copolymer from i) styrene ii) methacrylic acid iii) and optionally other monomers; b) a device for flash evaporation of the cosmetic preparation a), and to a method using corresponding products and to the use of the cosmetic preparation a) as process material in a device for flash evaporation.