Trichloroisocyanuric Acid, as an Industrial Chemical, Promotes Transthioacetalization of Diacetals of 2,2-Bis (Hydroxymethyl)-1,3-propanediol and Cleavage of Thioacetals
Trichloroisocyanuric acid has been used as a mild, efficient, and new catalyst for transthioacetalization of diacetals of 2,2-bis (hydroxymethyl)-1,3-propanediol in CH 2 Cl 2 at room temperature. A clean, easy, and general method for efficientdeprotection of thioacetals to their corresponding carbonyl compounds using trichloroisocyanuric acid/silica gel and water system also is described.
Cleavage of 1,3-Dithianes via Acid-Catalyzed Hydrolysis of the Corresponding 1,3-Dithianemonooxides
作者:Karsten Krohn、Stephan Cludius-Brandt
DOI:10.1055/s-2008-1067164
日期:2008.8
The hydrolysis of 1,3-dithianes to their parent carbonyl compounds via their corresponding monosulfoxides was systemati- cally investigated. The oxidation of the 1,3-dithianes was carried out in high yields using tert-butyl hydroperoxide. Acid-catalyzedhydrolysis of the monosulfoxides to the carbonyl compounds was then performed in excellent yields. The cleavage reactions were monitored by gas chromatography
Photoreactions of various dithioacetals and ketals using tris(p-chlorophenyl)pyrylium perchlorate as a sensitizer were studied. Irradiation (λ&>360 nm) of dichloromethane solutions containing dithioacetals or ketals and pyryliumsalt afforded the corresponding carbonyl compounds in good to excellent yields in the presence of molecular oxygen.
1-Benzenesulfinyl Piperidine
(BSP)/Triflic Anhydride: An Effective Combination for the
Hydrolysis of Dithioacetals
作者:David Crich、John Picione
DOI:10.1055/s-2003-40328
日期:——
The combination of 1-benzenesulfinyl piperidine and triflic anhydride, in conjunction with an aqueous workup, hydrolyses a broad range of dithioacetals to the corresponding carbonyl compounds under very mild, non-oxidative conditions.
INDIUM(III) CHLORIDE CATALYZED EFFICIENT CONVERSION OF CARBONYL COMPOUNDS TO 1,3-DITHIOACETALS
作者:J. S. Yadav、B. V. Subba Reddy、Sushil Kumar Pandey
DOI:10.1081/scc-120002509
日期:2002.1.1
ABSTRACT Several aldehydes and ketones were efficiently converted into their corresponding dithioacetals and 1,3-dithianes in high yields using catalytic amount of indium(III) chloride in dichloromethane.