alpha-Hydroxy ketones in high enantiomeric purity from asymmetric dihydroxylation of enol ethers. J Org Chem 1992;57(19):5067 - 5068.Hashiyama, T.; Morikawa, K.; Sharpless, K.B. -Hydroxy ketones in high enantiomeric purity from asymmetric dihydroxylation of enol ethers. J. Org. Chem. ...
The invention relates to novel ketones of formulae I and II wherein R 1 , R 2 , R 3 , and R 4 , are, for example, C 1 , -C 8 , alkyl, R 5 ,is, for example,hydrogen,A is C 1 , , Br, -O-Ry, -NR8R9 or -S-R 16 , A 1 , is -O-, -NH- o NR8-,X and ...
There is a need for cheap and simple methods to destroy recalcitrant pollutants such as dyes in waste water. It is shown that the radicals produced from the UV A and B photolysis of alpha-hydroxy ketones are capable of completely bleaching a wide range of azo dyes (Orange II, Amaranth, Ev...
An efficient and operationally simple method for the synthesis of α-acyloxy ketones through the readily available 2-methylimidazole-promoted reaction of α-hydroxy ketones and anhydrides is developed. In the reaction, the anhydrides act as both a substrate and a solvent. The new method features goo...
Reaction of α-hydroxy ketones, furoin (1a) and/or benzoin (1b), with an appropriate phosphorus ylide (6a–d) provides access to new alkenes E-8a–d, 15, 16 and/or furan derivatives 11a,b and 21. Furthermore, reaction of 1a,b with arylidenephosphorane 7 led to the formation of the...
ChemInform Abstract: HYDROXY KETONE REARRANGEMENTS PART 2, KINETICS AND MECHANISM OF THE THERMAL REARRANGEMENTS OF OPTICALLY ACTIVE ALPHA‐HYDROXY KETONES,... ChemInform Abstract: HYDROXY KETONE REARRANGEMENTS PART 2, KINETICS AND MECHANISM OF THE THERMAL REARRANGEMENTS OF OPTICALLY ACTIVE ALPHA‐HYDROXY KET...
The new method involves a tandem alpha-hydroxyalkylation/beta-chlorination of alpha,beta-acetylenic ketones by using TiCl4 as the chlorine source for alpha,beta-conjugate addition, and concurrently as the Lewis acid promoter for the carbonyl addition. The new system tolerates a b...
The rates of acid-catalyzed hydrolysis of diethyl ketal and 2,2-disubstituted 1,3-dioxolane derivatives of both aromatic and aliphatic ketones have been measured in 50% dioxane-water (v/v) at 30°. The 1,3-dioxolane derivatives of acetop... TH Fife,L Hagopian - 《Journal of Organic Chemi...
A reliable method for the one-step direct deoxygenation of alpha-hydroxy ketones has been developed using a silyl lithium reagent and acetic anhydride. The method is metal-catalyst-free and does not require prefunctionalization of the hydroxy group prior to its removal. Deoxygenation of different ...
The present invention relates to multi-phase liquid reaction medium containing the carboxylic acid a- hydroxyketone chemical catalytic hydrogenation to the corresponding alcohols. 羧酸可以是简单的羧酸或羟基羧酸. Carboxylic acid may be a simple carboxylic acid or hydroxy carboxylic acid. 羧酸的存在既提高...