An easy and high yielding transformation of epoxyketones and phenyl substituted epoxides to trans olefins in a convergent diastereoselective process is reported. The method was applied to the selective C-25 hydroxy-functionalisation of 3-keto-Delta(4)-cholestan-3-one, a key intermediate for the synthesis of C-25 hydroxy vitamin D-3. (C) 2000 Elsevier Science Ltd. All rights reserved.
The present invention pertains to pro-fragrances and relates to a pro-fragrance compound of the formula (I). Furthermore, the invention relates to compositions, a laundry product, a home care product, and an insect repellant, comprising the compound of formula (I). Also encompassed are a method for preparing the compound of formula (I) and uses of a compound of formula (I) for increasing the longlastingness of a fragrance, for increasing the stability and perception of a fragrance, and for improving the adhesion of a fragrance to textiles.
Suggested is a cosmetic compositions comprising
(a) a crosspolymer obtained from copolymerisation of at least two different polyols and at least one dicarboxylic acid and
(b) at least one fragrance.
The friedel-crafts reaction of acid chlorides with ethene ; Di-addition and molecular rearrangement
作者:Francis X Bates、John A Donnelly、John R Keegan
DOI:10.1016/s0040-4020(01)80962-5
日期:1991.1
Acid chlorides, complexed with excess aluminiumchloride, reacted with ethene to form 3-methyl-2-buten-1-ones, i.e. rearranged di-addition products having a terminal isoprenoid skeleton, together with the usual β-chloropropanones. The latter were the sole products in the absence of excess catalyst. Acid chlorides containing a suitably situated π-system underwent intramolecular cyclization, e.g. 2-
[EN] ACRYLATE-FUNCTIONAL BRANCHED ORGANOSILICON COMPOUND, METHOD OF PREPARING SAME, AND COPOLYMER FORMED THEREWITH<br/>[FR] COMPOSÉ D'ORGANOSILICIUM RAMIFIÉ À FONCTION ACRYLATE, SON PROCÉDÉ DE PRÉPARATION ET COPOLYMÈRE FORMÉ AVEC CELUI-CI
申请人:DOW SILICONES CORP
公开号:WO2020142474A1
公开(公告)日:2020-07-09
A method of preparing an acrylate-functional branched organosilicon compound ("compound") is provided, and comprises reacting (A) a branched organosilicon compound and (B) an acrylate compound in the presence of (C) a catalyst, wherein component (A) has the general formula X-Si(R1)3, where X comprises a halogen-functional moiety and each R1 is selected from R and –OSi(R4)3, with the proviso that at least one R1 is –OSi(R4)3; each R4 is selected from R, –OSi(R5)3, and –[OSiR2]mOSiR3; each R5 is selected from R, –OSi(R6)3, and –[OSiR2]mOSiR3; each R6 is selected from R and –[OSiR2]mOSiR3; each R is an independently selected hydrocarbyl group; and 0≤m≤100; with the proviso that at least one of R4, R5 and R6 is –[OSiR2]mOSiR3. The compound prepared by the method, a copolymer comprising the reaction product of the compound and a second compound, a method of forming the copolymer, and a composition comprising the copolymer are each also provided.
CYCLIC HYDRAZIDES AS FRAGRANCE PRECURSOR COMPOUNDS
申请人:Henkel AG & Co. KGaA
公开号:US20200399233A1
公开(公告)日:2020-12-24
Fragrance precursor compounds of the formula (I) may be derived from hydrazides and fragrance aldehydes and ketones. The fragrance precursor compounds may be used in composition having washing or cleaning agents, cosmetic agents and air care agents. A method for long-lasting fragrancing of surfaces using the fragrance precursor compounds and agents is also disclosed.