The nucleophilic ringopening reactions of epoxides by aliphatic alcohols and water are achieved efficiently in the presence of catalytic amounts of silica sulfuric acid with high degree of regioselectivity. The catalyst is reusable and can be applied several times without any decrease in the yield of reactions.
Derivatives of Heptaazaphenalene, Methods for Obtaining Them, and Their Use as Protecting Agents Against Uv Radiation
申请人:Trullas Carles
公开号:US20080193398A1
公开(公告)日:2008-08-14
The present invention relates to new heptaazaphenalene derivatives of general Formula (I) and to methods for obtaining them. The physicochemical properties of said compounds allow them to be used as UV radiation absorbents.
Ecotoxicity studies of glycerol ethers in Vibrio fischeri: checking the environmental impact of glycerol-derived solvents
作者:J. I. García、E. Pires、L. Aldea、L. Lomba、E. Perales、B. Giner
DOI:10.1039/c5gc00857c
日期:——
Most glycerol-derived ethers display low or null ecotoxicity againstVibrio fischeribiomarker, supporting the low environmental impact of this biobased solvent family.
Compounds having a structure of Formula I: wherein G, a, Q, L
2
, R
1
, R
2
, R
3
, R
4
, R
5
and R
6
are as defined herein are provided. Uses of such compounds for treatment of various indications, including prostate cancer as well as methods of treatment involving such compounds are also provided.
Iron Perchlorate on Silica Gel as Multi-purpose Reagent for Catalysis of Closure and Rupture of Carbon-Oxygen Bond in Epoxides, Alcohols, and Esters
作者:P. Salechi、M. M. Khodaei、S. B. Ghareghani、A. R. Motlagh
DOI:10.1023/b:rujo.0000003154.92028.84
日期:2003.6
Aliphatic alcohols and water in the presence of catalytic amounts of Fe3+ ion introduced as iron(Ill) perchlorate on silica gel carrier perform efficient regiospecific opening of an epoxy ring. Carbon acids esterification with various type alcohols was carried out using the system Fe(ClO4)(3)-silica gel in dichloromethane under conditions excluding solvolysis. Acetylation and formylation of alcohols was performed by efficient transesterification with ethyl acetate and ethyl formate.