共查询到20条相似文献,搜索用时 15 毫秒
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O. A. Nurkenov M. K. Ibraev D. M. Turdybekov A. M. Gazaliev Sh. T. Ibysheva K. M. Turdybekov M. B. Isabaeva 《Russian Journal of General Chemistry》2006,76(7):1134-1137
The acylation of dithiocarbamates derived from l-ephedrine and d-pseudoephedrine gives, depending on the structure of the acylating agent, acyl derivatives of the dithiocarbamates or their cyclic decomposition products, viz. oxazolidinethiones. 相似文献
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Summary Iodimetric estimation of dialkyl dithiocarbamate in alcoholic solution is not accurate. The method has not met with success for the water-soluble dithiocarbamates before. A simple and accurate iodimetric method has been developed for the estimation of water-soluble dithiocarbamates. The success of the method is due to the removal of the oxidation product which interferes during the titration with iodine. 相似文献
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三丁基锡二硫代氨基甲酸酯的合成及表征 总被引:2,自引:0,他引:2
通过三丁基氯化锡与二硫代氨基甲酸盐反应,合成了10个 三丁基锡二硫代氨基甲酸酯,利用元素分析,IR、HNMR、UV和TG-DTA表征了这些化合物结构,测定了部分化合物的生物活性。 相似文献
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Yunyun Liu 《Tetrahedron letters》2007,48(27):4785-4788
The Ullmann-type coupling reaction of sodium dithiocarbamates with aryl iodides and vinyl bromides catalyzed by CuI/N,N-dimethylglycine proceeds smoothly in DMF at 110 °C to give corresponding dithiocarbamates in good yields. 相似文献
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The use of copper(II) perchlorate and tetra-acetonitrilocopper(I) perchlorate (in acetonitrile) for the potentiometric and spectrophotometric determination of dithiocarbamates in acetonitrile medium is described. The proposed methods are simple, accurate and reliable and show promise of wide applicability. They are recommended for routine determination of dithiocarbamates. Their advantages over the carbon disulphide evolution method, commonly employed for the determination of these compounds, are discussed. 相似文献
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Carbon disulphide reacts readily with primary alkylamines to yield dithiocarbamates. When injected into the heated injection port of a gas chromatograph, the dithiocarbamates yield the corresponding isothiocyanates. This reaction provides a simple and elegant derivatisation for quantifying, and also confirming the identify of, the primary alkylamines. 相似文献
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Synthesis of novel dithiocarbamates and xanthates using dialkyl azodicarboxylates: S
N bond formation
A one?pot three?component route for the synthesis of a novel category of dithiocarbamates or xanthates is developed by a reaction of in-situ generated dithiocarbamic acids or xanthates with dialkyl azodicarboxylates under mild and catalyst-free conditions. The reaction is characterized by a wide scope, high efficiency and straightforward isolation protocol. The synthetic utility of the dithiocarbamates and xanthates was demonstrated on the preparation of symmetrical and unsymmetrical thioureas, isothiocyanates, and thiocarbamates. 相似文献
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A novel process for the one-step chemoselective conversion of alkyl halides into dithiocarbamates as protected amines was
developed using benzyltrimethylammonium hydroxide (Triton-B) in presence of carbon disulfide. Thus, dithiocarbamates of different
amines were prepared in very good to excellent yields. This protocol is mild, chemoselective, and efficient compared to other
methods. 相似文献
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《中国化学快报》2023,34(11):108403
An eco-friendly and convenient method is developed herein for the synthesis of S-aryl dithiocarbamates via visible-light-induced SET process of an EDA complex between thianthrenium salt functionalized arenes and dithiocarbamate anions under mild aqueous micellar conditions. This strategy indirectly realizes the method for constructing S-aryl dithiocarbamates through site-selective C−H functionalization of arenes. Most importantly, the reaction proceeded smoothly without addition of any photocatalyst, and the by-product thianthrene is recycled in quantity, ultimately minimizing the production of chemical waste. This protocol provides a promising synthesis candidate for the construction of valuable S-aryl dithiocarbamates, which also opens up a new avenue for micellar photocatalysis. 相似文献
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M. Destarac D. Charmot X. Franck S. Z. Zard 《Macromolecular rapid communications》2000,21(15):1035-1039
Control of the radical polymerization of acrylates, styrene and vinyl acetate has been achieved by using novel dithiocarbamates as reversible addition‐fragmentation chain transfer agents. The key parameter for the control with N,N‐disubstituted (A) or cyclic (B) dithiocarbamates was found to be the conjugation of the lone pair of electrons of the nitrogen atom with carbonyl or aromatic groups. 相似文献
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An efficient method for synthesis of 2H-pyran-3,4-dicarboxylates using the three-component reaction of dithiocarbamates, dialkyl acetylenedicarboxylates, and isocyanides in solvent-free conditions is described. In these reactions, synthesis of dithiocarbamates is possibly based on the one-pot reaction of secondary amines, CS2, and alkyl halides in solvent-free conditions without using a catalyst. The mild reaction conditions and high yields of the reaction exhibit the good synthetic advantage of these methods. 相似文献
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A procedure has been developed for the determination of six dithiocarbamates [sodium dimethyldithiocarbamate (dibam), sodium diethyldithiocarbamate (NaDDC), tetramethylthiuram disulphide (thiram), zinc dimethyldithiocarbamate (ziram), sodium N-methylpiperazinecarbodithioate and potassium morpholine-4-carbodithioate] in microgram quantities by converting them into selenium dithiocarbamate complexes, which are then extracted into chloroform and measured at 430 nm against a reagent blank. The method is sensitive and can be used for the determination of dithiocarbamates in commercial samples and synthetic mixtures. 相似文献
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《Analytical letters》2012,45(5):327-334
Abstract The quantitative determination of N,N-dialkyl dithiocarbamates tetramethylthiuram disulfide and tetramethyl-thiuram monosulfide in industrial wastewater was studied by thin-layer densitometry of their copper complexes. It has been demonstrated that a densitometer provides a simple and rapid means to quantitate these compounds. N,N-dialkyl dithiocarbamates have been analyzed in microgram quantities using this method. Coefficients of variation of 2–6 per cent were obtained. 相似文献
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A High Yielding, One-Pot, Triton-B Catalyzed Synthesis of Dithiocarbamates Using Alcoholic Tosylates
Summary. A novel process for the one-step chemoselective conversion of alcoholic tosylates into dithiocarbamates as protected amines
was developed using benzyltrimethylammoniumhydroxide (Triton-B) in presence of carbon disulfide. Thus, dithiocarbamates of
different amines were prepared in very good to excellent yields. This protocol is mild, chemoselective, and efficient compared
to other reported methods.
Present address: Institute of Organic and Biomolecular Chemistry, Georg-August University, D-37077, G?ttingen, Germany 相似文献
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A facile and direct highly stereoselective synthesis of [E]- and [Z]-allyl dithiocarbamates has been accomplished from acetates of Baylis-Hillman (BH) adducts in catalyst-free one-pot three-component coupling reactions of carbon disulfide and amine in water under a mild and green procedure with high yields. The reaction pathway involves the nucleophilic displacement (SN2′) of BH acetates by dithiocarbamate anions. The utility of these allyl dithiocarbamates has also been demonstrated in heterocyclic chemistry. © 2009 Elsevier Science. All rights reserved 相似文献
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Summary. A novel process for the one-step chemoselective conversion of alkyl halides into dithiocarbamates as protected amines was
developed using benzyltrimethylammonium hydroxide (Triton-B) in presence of carbon disulfide. Thus, dithiocarbamates of different
amines were prepared in very good to excellent yields. This protocol is mild, chemoselective, and efficient compared to other
methods.
Present address: Institute of Organic and Biomolecular Chemistry, Georg–August University, D-37077 G?ttingen, Germany 相似文献
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A non-aqueous titrimetric method for determination of dithiocarbamates with cerium(IV), is described. The compounds are titrated at room temperature, with visual and potentiometric end-point detection. In visual titrations, the reagent serves as self-indicator and turns the solution yellow at the end-point. Methyl Red can also be used as the indicator. The method has been applied to the determination of amines after their quantitative conversion into dithiocarbamates by reaction with carbon disulphide. The proposed method is accurate to +/- 0.8% with a relative standard deviation of +/- 0.7%. 相似文献