H3PW12O40–[bmim][FeCl4]: A novel and green catalyst-medium system for microwave-promoted selective interconversion of alkoxymethyl ethers into their corresponding nitriles, bromides and iodides
Microwave-assisted rapid and efficient deprotection and direct esterification and silylation of MOM and EOM ethers catalyzed by [Hmim][HSO4] as a Brønsted acidic ionic liquid
Abstract1-Methylimidazolium hydrogensulfate, [Hmim][HSO4], a Brønstedacidic room temperature ionicliquid, is used as a catalyst and reaction medium for facile and eco-friendly deprotection of methoxymethyl (MOM) and ethoxymethyl (EOM) ethers to their corresponding alcohols under thermal conditions (Δ) and microwave irradiation (MW). Furthermore, one-pot interconversion to the respective acetates and
TIME TEMPERATURE INDICATOR BASED ON THIOALKYL AND THIOARYL SUBSTITUTED SPIROAROMATICS
申请人:Salman Husein
公开号:US20110287549A1
公开(公告)日:2011-11-24
The present invention relates to photochromic spiropyrans as active ingredients of Time-Temperature Indicators (TTIs), and to new spiropyrans per se. More particularly, the invention provides TTIs on the base of photochromic spiropyrans comprising alkylsulfanyl/arylsulfanyl substituents in the phenyl ring of the benzopyrane moiety.
Triaromatic compounds and pharmaceutical/cosmetic compositions comprised
申请人:Centre International de Recherches Dermatologiques
公开号:US06150413A1
公开(公告)日:2000-11-21
Novel pharmaceutically/cosmetically-active triaromatic compounds have the structural formula (I): ##STR1## and are useful for the treatment of a wide variety of disease states, whether human or veterinary, for example dermatological, rheumatic, respiratory, cardiovascular, bone and ophthalmological disorders, as well as for the treatment of mammalian skin and hair conditions/disorders.
Résumé A simple, green and chemoselective method for methoxymethylation and ethoxymethylation of primary and secondary alcohols using a Lewis acidic room temperature ionic liquid, [C4mim][InCl4], as catalyst and reaction medium under ambient temperature, microwave and ultrasonic irradiations is reported. In this catalytic system, the corresponding MOM-and EOM-ethers are obtained in excellent yields and in short reaction times. Furthermore, this catalytic system was used for mild and efficient transformations of these protected alcohols to their corresponding acetates and trimethylsilyl ethers under thermal conditions and microwave and ultrasonic irradiations.
Composés triaromatiques, compositions les contenant et utilisations
申请人:CENTRE INTERNATIONAL DE
RECHERCHES DERMATOLOGIQUES GALDERMA (C.I.R.D. GALDERMA)
公开号:EP0879814A1
公开(公告)日:1998-11-25
L'invention conceme de nouveaux composés triaromatiques qui présentent comme formule générale (I) :
ainsi que l'utilisation de ces derniers dans des compositions pharmaceutiques destinées à un usage en médecine humaine ou vétérinaire (affections dermatologiques, rhumatismales, respiratoires, cardiovasculaires et ophtalmologiques notamment), ou bien encore dans des compositions cosmétiques.