摘要:
La présente demande concerne des compositions cosmétiques ou pharmaceutiques comprenant des composés de formule (I) :
dans laquelle : - R 1 est un radical choisi parmi -COOR', -CONR'R", -CH 2 OR', -COR', -CH 2 R',-SO 2 OR', -PO 3 R'R", -NHR' avec R' et R" désignant un atome d'hydrogène ou un radical hydrocarboné en C1-18, - R 2 est un radical hydrocarboné en C1-18. L'invention concerne également l'utilisation de ces composés pour favoriser la desquamation de la peau, stimuler le renouvellement épidermique et lutter contre les signes du vieillissement cutané.
摘要:
2-Acetoxyalkanoic acid esters are made in a reaction of a 3,6-dialkyl-1,4-dioxane-2,5-dione or a poly(α-hydroxyalkanoic acid), an acetate ester and an alcohol or phenol in the presence of a transesterification catalyst. Unlike previous methods for making 2-acetoxyalkanoic acid esters, this process proceeds in high yield and high selectivity to the desired product.
摘要:
(Meth)acrylates are prepared in a single-step method from a mixture of (meth)acrylic acid and at least one biobased oil and/or its derivative(s), including at least one unsaturation. The (meth)acrylates are made by directly adding the (meth)acrylic acid to the biobased oil by reacting in the presence of an acid catalyst, including an inorganic or organic acid having at least one oxygen atom present thereon and which possesses at least one acid functionality having an ionization constant in water which is not greater than 3.
摘要:
The invention discloses a method for the preparation of substituted 6-trifluoromethylpyridine-3-carboxylic acid derivatives starting from 4,4,4-trifluoro-3-oxobutanoyl chloride via respective intermediates and respective steps.
摘要:
The present invention concerns the use as perfuming ingredient (of the fruity type) of a compound of formula (I) in the form of any one of its stereoisomers or of a mixture thereof, and wherein R1 represents a C1-3 alkyl or alkenyl group, R2 represents a methyl or ethyl group, R3 represents a C1-4 alkyl or alkenyl group, and said compound (I) has from 8 to 12 carbon atoms.
摘要:
The invention relates to novel compounds having Rf terminal groups, the use thereof as surface-active substances and methods for producing said compounds.
摘要:
Synthesis and intermediates The invention relates to novel synthesis methods for the preparation of the intermediates, which are suitable for the preparation of statin derivatives, especially to novel synthesis methods of the intermediate of formula VI
wherein R a ' and R c ' are each independently of the other hydrogen or a hydroxy-protecting group or together are a bridging hydroxy-protecting group, and R b is a carboxy-protecting group, which methods are carried out by conversion of the intermediate of formula XVI
wherein R a ' and R c ' are each independently of the other hydrogen or a hydroxy-protecting group, R* and R** are each independently of the other hydrogen or an amide-protecting group, and R b is a carboxy-protecting group; which methods proceed to further new intermediates and methods for their preparation.