Nickel Boride–Mediated Cleavage of 1,3-Dithiolanes: A Convenient Approach to Reductive Desulfurization
摘要:
1,3-Dithiolanes are rapidly cleaved by nickel boride, generating corresponding hydrocarbons in excellent yields. The hydrogenolysis is rapid at room temperature and does not require protection from the atmosphere. Mild reaction conditions, simple workup, and good yields of pure products are some of the major advantages of the procedure.
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.
2,4,4,6-Tetrabromo-2,5-cyclohexadienone (TABCO), N-Bromosuccinimide (NBS) and Bromine as Efficient Catalysts for Dithioacetalization and Oxathioacetalization of Carbonyl Compounds and Transdithioacetalization Reactions
作者:Nasser Iranpoor、Habib Firouzabadi、Hamid Reza Shaterian、M. A. Zolfigol
DOI:10.1080/10426500211712
日期:2002.5.1
6-tetrabromo-2,5-cyclohexadienone (TABCO), N-bromosuccinimide (NBS), and bromine as efficient catalysts for conversion of carbonyl compounds to their cyclic and acyclic dithioacetals and 1,3-oxathiolanes under mild reaction conditions are described. These catalysts are also used for efficient transdithioacetalization of acetals, diacetals, ketals, acylals, enamines, hydrazones, and oximes with high
An Efficient Method for Chemoselective Thioacetalization of Aldehydes in the Presence of a Catalytic Amount of Acidic Ionic Liquid under Solvent-Free Conditions
作者:Abdol Hajipour、Ghobad Azizi、Arnold Ruoho
DOI:10.1055/s-0029-1217550
日期:2009.7
A water-stable Brønsted acidic ionic liquid with an alkane sulfonic acid group was synthesized. This ionic liquid catalyzed the thioacetalization reaction smoothly to afford 1,3-dithianes in excellent yield and less time. In this article we describe a mild and chemoselective thioacetalization procedure for the protection of various aldehydes in the presence of catalytic amount of ionic liquid (2 mol%).
A Simple and Efficient Heterogeneous Procedure for Thioacetalization of Aldehydes and Ketones
作者:Mohammed Hashmat Ali、Maria Goretti Gomes
DOI:10.1055/s-2005-865303
日期:——
A new procedure for the protection of aldehydes and ketones as thioacetals promoted by catalytic amount of p-toluene-sulfonic acid and silica gel has been developed. This procedure offers versatility, short reaction time,excellent yield, good selectivity, and flexibility in terms of choice of solvent that can be utilized in this reaction. The procedure is easy to carry out and does not require aqueous
LiBF<sub>4</sub> Catalyzed Chemoselective Conversion of Aldehydes to 1,3-Oxathiolanes and 1,3-Dithianes
作者:J. S. Yadav、B. V. S. Reddy、Sushil Kumar Pandey
DOI:10.1055/s-2001-10780
日期:——
Lithium tetrafluoroborate is found to be an efficient catalyst for the chemoselective protection of both aromatic and aliphatic aldehydes as 1,3-oxathiolanes and 1,3-dithianes under mild reaction conditions. Due to the neutral reaction conditions, this method is compatible with acid sensitive substrates.