The invention relates to a method for finding and assessing agonists [and] antagonists of the aryl hydrocarbon receptor (Ah receptor; AhR), to the agonists and antagonists themselves and to uses thereof.
Efficient and Simple Approaches Towards Direct Oxidative Esterification of Alcohols
作者:Ritwika Ray、Rahul Dev Jana、Mayukh Bhadra、Debabrata Maiti、Goutam Kumar Lahiri
DOI:10.1002/chem.201403786
日期:2014.11.17
The present article describes novel oxidative protocols for directesterification of alcohols. The protocols involve successful demonstrations of both “cross” and “self” esterification of a wide variety of alcohols. The cross‐esterification proceeds under a simple transition‐metal‐free condition, containing catalytic amounts of TEMPO (2,2,6,6‐tetramethyl‐1‐piperidinyloxy)/TBAB (tetra‐n‐butylammonium
Polyol polyester-containing personal care products that do not contain low viscosity silicone fluids
申请人:Burgo Rocco
公开号:US20050260150A1
公开(公告)日:2005-11-24
The invention provides a personal care product that does not contain a lower viscosity silicone fluid; the personal care product includes at least one polyol polyester that is the esterification reaction product of a polyol having three to six carbons atoms and a carboxylic acid having three to six carbon atoms and a personal care formulation. Also provided are replacement compositions for use in personal care products that are at least one polyol polyester that is the esterification reaction product of a polyol having three to six carbons atoms and a carboxylic acid having three to six carbon atoms and having a kinematic viscosity of about 2 to about 20 centistokes at 25° C. and wherein the replacement composition does not contain a low viscosity silicone fluid. Related methods are also described.
Symmetric esters by Tischtschenko reaction of aldehydes catalyzed by bi- and tridentate catalysts derived from catechol or gallol, trimethylaluminum and isopropanol
作者:Ilkka Simpura、Vesa Nevalainen
DOI:10.1016/s0040-4020(01)01004-3
日期:2001.12
New inexpensive aluminum-based bidentate and tridentate chelates were found to be efficient catalysts for the Tischtschenkoreaction of aldehydes. The conversion of n-butanal to n-butyl n-butyrate using catechol-derived catalysts at room temperature was complete (the yield of the butyrate was 99%) in two hours. High yields of symmetric esters were obtained in the case of n-alkyl and α-branched aliphatic
the latter type of product is obtained. While pivaldehyde reacts normally, benzaldehyde is unaffected by the reagent under the same conditions. Presence of moisture results in formation of acids. It is suggested that reactions of both types of substrates involve base catalysedfragmentation of iodonium intermediates.