- Direct Nucleophilic Substitution of Alcohols Using an Immobilized Oxovanadium Catalyst
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Direct nucleophilic substitution of alcohols with thiols or carbon nucleophiles was achieved using a mesoporous silica-supported oxovanadium catalyst (VMPS4). Benzyl and allyl alcohols were compatible in this reaction under mild conditions, affording the products in high yields. The VMPS4 catalyst showed excellent chemoselectivity toward alcohols in the presence of acid-labile functional groups, which is in contrast to that observed for the commonly used Lewis acid catalysts, which exhibit poor selectivity. The VMPS4 catalyst could be recycled by simple centrifugation, and the catalytic activity was maintained over seven cycles.
- Nishio, Tomoya,Yoshioka, Shin,Hasegawa, Kai,Yahata, Kenzo,Kanomata, Kyohei,Akai, Shuji
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p. 4417 - 4422
(2021/07/16)
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- PHOTOCATALYTIC SYSTEM AND APPLICATIONS THEREOF
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The present invention relates to novel poly(heptazine imides), a photocatalytic system comprising such poly(heptazine imides) and a sulfur source as well as the application thereof in photocatalytic reactions.
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Page/Page column 27; 28
(2019/05/15)
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- A waiting carbon nitride radical anion: A charge storage material and key intermediate in direct C-H thiolation of methylarenes using elemental sulfur as the s -source
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Potassium poly(heptazine imide), a carbon nitride based semiconductor with high structural order and a valence band potential of +2.2 V vs. NHE, in the presence of hole scavengers and under visible light irradiation gives the corresponding polymeric radical anion, in which the specific density of unpaired electrons reaches 112 μmol g-1. The obtained polymeric radical anion is stable under anaerobic conditions for several hours. It was characterized using UV-vis absorption, time resolved and steady state photoluminescence spectra. The electronic structure of the polymeric radical anion was confirmed by DFT cluster modelling. The unique properties of potassium poly(heptazine imide) for storing charges were employed in visible light photocatalysis. A series of substituted dibenzyldisulfanes was synthesized in 41-67% yield from the corresponding methylarenes via cleavage of the methyl C-H bond under visible light irradiation and metal-free conditions.
- Savateev, Aleksandr,Kurpil, Bogdan,Mishchenko, Artem,Zhang, Guigang,Antonietti, Markus
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p. 3584 - 3591
(2018/04/12)
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- 1-aryl ethanesulfonic acid and preparation method of its derivative
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The invention provides 1-aryl ethanesulfonic acid and a preparation method of its derivative. The preparation method comprises the following steps that (a) 1-aryl halogensated ethane represented in aformula (I) and sodium hydrosulfide react to generate 1-
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Paragraph 0051-0053
(2018/04/03)
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- Imidazole Promoted Highly Efficient Large-Scale Thiol-Free Synthesis of Symmetrical Disulfides in Aqueous Media
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A highly efficient and environmentally friendly method for the imidazole promoted preparation of symmetrical organic disulfides from Bunte salts is described. This thiol-free procedure produces the desired disulfides even on a large scale by reaction of Bunte salts with imidazole in good to high yields in aqueous media.
- Mokhtari, Babak,Kiasat, Ali Reza,Monjezi, Javid
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p. 1573 - 1579
(2015/09/15)
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- Alkoxy disulfides as antimicrobial agents
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Disclosed is a method of inhibiting the growth of microorganisms in, at, or on a locus subject to microbial attack, comprising introducing to said locus an antimicrobially effective amount of at least one alkoxy disulfide of formula:R-CHR-O-S-S-O-CHR-R wh
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- METALATION REACTIONS. VII. METALATION OF BENZYLALKYL AND β-PHENETHYLALKYL SULFIDES
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The products from the reaction between n-butyllithium and benzylalkyl and β-phenethylalkyl sulfides followed by carbonation, have been investigated by GLC/MS analysis.With benzylalkyl sulfides metalation occurs at the benzylic position, and the corresponding carboxylic acid can be isolated, but side products from Wittig like rearrangement, cleavage of the thioether bond, and aliphatic and aromatic substitution are also obtained.No benzylic metalation or Wittig-like rearrangement products are obtained from β-phenethyl sulfides: instead cleavage of the thioether bond and aliphatic and aromatic substitution occur.
- Cabiddu, S.,Floris, C.,Melis, S.,Piras, P. P.,Sotgiu, F.
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p. 149 - 156
(2007/10/02)
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