[EN] ORGANOSILOXANES CONTAINING ESTER DERIVATIVES OF ASCORBIC ACID<br/>[FR] ORGANOSILOXANES CONTENANT DES DÉRIVÉS ESTERS DE L'ACIDE ASCORBIQUE
申请人:DOW CORNING
公开号:WO2009045709A1
公开(公告)日:2009-04-09
Organosiloxanes containing ester derivatives of ascorbic acid are disclosed having the formula (RiSiO)11Ro-Ii)Si-X- A wherein R is an alkyl group containing 1 to 6 carbon atoms, n is I to 3 inclusive, X is a divalent organic linking group, A is an ester derivati ve of ascorbic acid. A method of making an organosiloxane containing ester derivatives of ascorbic acid and the products prepared according to the method arc also taught. The compounds and compositions of the present disclosure are useful to affect tissue lightening when applied topically to keratinaceous tissue.
Pt<sup>II</sup>−N‐Heterocyclic Carbene Complexes in Solvent‐Free Alkene Hydrosilylation
作者:Benon P. Maliszewski、Tahani A. C. A. Bayrakdar、Perrine Lambert、Lama Hamdouna、Xavier Trivelli、Luigi Cavallo、Albert Poater、Marek Beliš、Olivier Lafon、Kristof Van Hecke、Dominic Ormerod、Catherine S. J. Cazin、Fady Nahra、Steven P. Nolan
DOI:10.1002/chem.202301259
日期:2023.7.14
Pt(II)−NHC complexes are used in alkene hydrosilylation reactions. Some of the examined compounds display excellent catalytic activity, outperforming Pt(0)−NHC pre-catalysts. Our study explores the catalyst structure-activity relationship and provides new mechanistic insights into this industrially important transformation. A sustainable protocol, featuring efficient platinum removal, allows us to