69922-37-8Relevant academic research and scientific papers
Indium-Catalyzed Reductive Dithioacetalization of Carboxylic Acids with Dithiols: Scope, Limitations, and Application to Oxidative Desulfurization
Nishino, Kota,Minato, Kohei,Miyazaki, Takahiro,Ogiwara, Yohei,Sakai, Norio
, p. 3659 - 3665 (2017/04/11)
In this study an InI3-TMDS (1,1,3,3-tetramethyldisiloxane) reducing system effectively catalyzed the reductive dithioacetalization of a variety of aromatic and aliphatic carboxylic acids with 1,2-ethanedithiol or 1,3-propanedithiol leading to the one-pot preparation of either 1,3-dithiolane derivatives or a 1,3-dithiane derivative. Also, the intact indium catalyst continuously catalyzed the subsequent oxidative desulfurization of an in situ formed 1,3-dithiolane derivative, which led to the preparation of the corresponding aldehydes.
Poly(N-bromobenzene-1,3-disulfonamide) and N,N,N′,N′- tetrabromobenzene-1,3-disulfonamide as a mild and efficient catalyst for chemoselective thioacetalization of carbonyl functions and transthioacetalization reactions
Veisi, Hojat,Ghorbani-Vaghei, Ramin,Dadamahaleh, Somayeh Akbari
experimental part, p. 699 - 705 (2011/07/31)
Poly(N-bromobenzene-1,3-disulfonamide) and N,N,N′,N′- tetrabromobenzene-1,3-disulfonamide are effective catalysts for chemoselective dithioacetalization of aldehydes in the presence of ketones under neutral conditions.
Process for production of 1,4-bis(difluoroalkyl)benzene derivative
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Page column 8, (2008/06/13)
A process is provided which allows a 1,4-bis(difluoroalkyl)benzene derivative to be produced inexpensively by a simple procedure without requiring any special facility. This process comprises causing a compound (A) of the following formula (1): wherein X1, X2, X3, and X4 independently stand for an oxygen or sulfur atom, Y1 and Y2 independently stand for a group of the formula: —CnH2n—, in which n is 2 or 3, k is an integer in the range of 0 to 4, G stands for a halogen group, an alkyl group, a perfluoroalkyl group, or an alkoxy group, and m is an integer in the range of 0 to 4, to react with a fluorine-containing species, the molar ratio of the fluorine-containing species to compound (A) being in the range of 20-40. The process is carried out in the presence of a bromine-containing compound, which is in an amount of 2 to 3 equivalences to the amount of compound (A), in an organic solvent at ?80° C. to 30° C., the final concentration of compound (A) being in the range of 3 to 30% by weight.
Selective Catalytic Transesterification, Transthiolesterification, and Protection of Carbonyl Compounds over Natural Kaolinitic Clay
Ponde, Datta E.,Deshpande, Vishnu H.,Bulbule, Vivek J.,Sudalai, Ammugam,Gajare, Anil S.
, p. 1058 - 1063 (2007/10/03)
Transesterification and transthiolesterification of β-keto esters with variety of alcohols and thiols and selective protection of carbonyl functions with various protecting groups catalyzed by natural kaolinitic clay are described. The clay has been found to be an efficient catalyst in transesterifying long chain alcohols, unsaturated alcohols, and phenols to give their corresponding β-keto esters in high yields. For the first time, transthiolesterification of β-keto esters with a variety of thiols has been achieved under catalytic conditions. Clay also catalyzes selective transesterification of β-keto esters by primary alcohols in the presence of secondary and tertiary alcohols giving corresponding β-keto esters. A systematic study involving the reactivity of different nucleophiles (alcohols, amines, and thiols) toward β-keto esters is also described. Sterically hindered carbonyl groups as well as α,β-unsaturated carbonyl groups underwent protection without the deconjugation of the double bond. Chemoselective protection of aldehydes in the presence of ketones has also been achieved over natural kaolinitic clay.
A general synthesis of vinylic silyl hydrides using nickel catalysis. Applications to the syntheses of silylene-tethered conjugated polymers
Chen, Ruey-Min,Luh, Tien-Yau
, p. 1197 - 1206 (2007/10/03)
Treatment of benzylic or allylic dithioacetals with Me2((i)PrO)SiCH2MgCl in the presence of NiCl2(PPh3)2 catalyst yielded the corresponding i-propoxy(vinyl)silanes which are reduced with LiAlH4/
Natural kaolinitic clay: A remarkable reusable solid catalyst for the selective functional protection of aldehydes and ketones
Ponde, Datta,Borate,Sudalai,Ravindranathan,Deshpande
, p. 4605 - 4608 (2007/10/03)
Natural kaolinitic clay possessing transition metals such as Fe and Ti in its lattice has been found to catalyze efficiently the chemoselective acetalization and thioacetalization of variety of carbonyl compounds with ethane - 1,2 - diol and ethane - 1,2 - dithiol respectively.
Selective Protection of Carbonyl Compounds. Silica Gel Treated with Thionyl Chloride as an Effective Catalyst for Thioacetalization
Kamitori, Yasuhiro,Hojo, Masaru,Masuda, Ryoichi,Kimura, Tadashi,Yoshida, Tatsushi
, p. 1427 - 1431 (2007/10/02)
Silica gel treated with thionyl chloride was found to be an effective as well as highly selective catalyst for thioacetalization of aldehydes.With the use of this catalyst 1,3-dithioranes and 1,3-dithianes were obtained in excellent yields from various aldehydes.Under the same conditions ketones were similarly but more slowly thioketalized.This difference in reactivity between aldehydes and ketones was successfully utilized for the thioacetalization of aldehydes in the presence of ketones and also for the chemoselective conversion of keto aldehydes into the corresponding dithioacetals with the keto group remaining intact.
The Oxidation of Hexathioethanes to Tetrathioethene Radical Cations
Bock, Hans,Braehler, Georg,Henkel, Udo,Schlecker, Rainer,Seebach, Dieter
, p. 289 - 301 (2007/10/02)
The oxidation of hexakis(alkylthio)ethanes (RS)3C-C(SR)3 by AlCl3/H2CCl2, NOBF4, or I2 yields tetrakis(alkylthio)ethene radical cations (RS)2C.+=C(SR)2.The dark violet tetrahydrotetrathiafulvalenium triiodide 1*I3 (n = 2) has been obtained as a
