CAS: 1141-88-4; 2,2-Disulfanediyldianiline

相似化合物

1155-00-6 182499-80-5 63755-07-7

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2-氨基苯并噻唑置于potassium Hydroxide体系中,用 水,乙二醇 用作溶剂,化学反应 24.0H,以61%的收率获得双(2-氨基苯基)二硫
参考文献:5-(5,6-二甲氧基苯并噻唑-2-基)-2'-脱氧尿苷(dbtu)和含有dbtu的寡脱氧核糖核苷酸的荧光性质
标题:5-(5,6-二甲氧基苯并噻唑-2-基)-2'-脱氧尿苷(dbtu)和含有dbtu的寡脱氧核糖核苷酸的荧光性质
摘要:描述了11个含d Bt U的5-(苯并噻唑-2-基)-2-'-脱氧尿苷衍生物和寡脱氧核糖核苷酸(odn)的光物理性质.比较了包含5'-X Bt U-3'和5'-Bt Uy-3'的16种组合的odn的荧光特性,发现d Bt U是一种非常有前途的新荧光类似物,但对dbt U的敏感性较低.它在dna中的微环境.
Doi:10.1002/ejoc.201100818

专利信息

专利号:WO-2024142008-A1
优先权日:2022-12-29
标 题:A process for the preparation of 2,2' dithiobisbenzanilide
发明人：JAYABALAN LAKSHMANAN; NAMBOODIRI JANARDANAN KAPYUR; CHAUDHURI MONOJIT
权利人:NITREX CHEMICALS INDIA LTD
摘要:The present disclosure relates to a process for the preparation of 2,2'- dithiobisbenzanilide The process involves the hydrolysis of benzothiazole, followed by subsequent oxidation, and the benzoylation of the resulting reaction products to yield 2,2'-dithiobisbenzanilide. The process of the present disclosure is a one-pot synthesis and uses a minimal amount of base for the synthesis of 2,2'-dithiobisbenzanilide. The process is simple, economical, eco-friendly, and commercially scalable.

专利号:US-3759935-A
优先权日:1969-11-03
标题 :Azoles method for the preparation of 2-alkyl substituted thiazoles and selen
发明人：DE CAT A; MANSSENS L
权利人:AGFA GEVAERT NV
摘要:WHEREIN: Alk stands for C1-C5 alkyl for example methyl and ethyl, X stands for sulphur or selenium, Y stands for nitro or amino, Z1 stands for the atoms necessary to complete a benzene or naphthalene ring including a substituted benzene or naphthalene ring for instance substituted by alkyl including substituted alkyl for example methyl, ethyl, trifluoromethyl, acyloxymethyl, and hydroxymethyl, alkenyl for example allyl, aryl including substituted aryl, halogen such as chlorine, alkyloxy, alkylthio, alkylsulphonyl, haloalkyloxy, haloalkylthio, haloalkylsulphonyl, carboxy, sulpho, amino, (di)alkylamino, acylamino, nitro, alkoxycarbonyl, etc., and Z2 stands for the atoms necessary to complete a benzene or naphthalene ring optIonally carrying substituents, which are either identical to the substituents present in Z1 or are derived forms thereof converted under the reaction conditions of the invention such as amino where Z1 carries nitro, acetyloxymethyl where Z1 carries hydroxymethyl, propyl where Z1 carries allyl, etc. Under the reaction conditions of the invention it would be possible to prepare the benzothiozoles starting from 2nitrothiophenols instead of using bis(2nitrophenyl)disulphides; however, 2-nitrothiophenols as compared with bis(2-nitrophenyl)-disulphides disulphides are difficult to prepare. The method of the present invention comprises more especially the steps of admixing an aromatic disulphide or diselenide carrying in the 2-positions relative to the disulphide or diselenide group nitro groups or amino groups with an aliphatic carboxylic anhydride and a catalytic amount of a rhenium sulphide, charging the reaction vessel with a sufficient hydrogen pressure, heating the reaction mixture to a temperature at which hydrogen is readily absorbed until absorption of hydrogen ceases, cooling the reaction mixture to a temperature below the boiling temperature of the aliphatic carboxylic acid formed, filtering off the rhenium sulphide catalyst and isolating the 2-alkyl heterocyclic base formed from the filtrate by any suitable means e.g., by concentrating the filtrate by evaporation if necessary under rpduced pressure and filtering off the precipitate formed or distilling the residue. The rhenium sulphide catalyst is generally used in amounts comprised between 0.25 g and 10 g, preferably from 1 g to 5 g per mole of disulphide or diselenide compound. The amount of aliphatic carboxylic anhydride used may vary between wide limits. The most effective amount can easily be determined by some simple tests. The required minimum theoretical amount depends on whether there is stated from a 2,2''-dinitro aromatic disulphide or diselenide or from a 2,2''-diaminoaromatic disulphide or diselenide and from the optional presence of further nitro and amino groups. The minimum amount of aliphatic carboxylic anhydride is 3 moles of anhydride per nitro group present and 2 moles of anhydride per amino group present. Solubility considerations may necessitate the use of larger amounts and also supplemental amounts may be required to convert other groups present in the starting material. Indeed, the 2,2''-dinitro (or 2,2''-diamino)phenyl (or naphthyl) disulphide or diselenide might comprise in addition to the 2,2''dinitro (or diamino) groups, groups known to those skilled in the art of preparative organic chemistry to undergo alteration under the reaction conditions of the method of the invention either by reaction with the carboxylic anhydride used or by being itself hydrogenated so that the resulting thiazole or selenazole compounds comprise in the fused-on aromatic ring substituents of a nature different from those of the starting materials. For instance when the 2,2''-dinitro (or 2,2''-diamino)phenyl (or naphthyl) disulphide or diselenide comprises further nitro or amino groups, the heterocyclic base formed will carry an acyl amino group, by reaction of the amino or reduced nitro group with the aliphatic acarboxylic anhydride; as known by those skilled in the art of preparative organic chemistry the acyl amino group can be converted into amino by boiling with hydrochloric acid. In the same way, substituents in the starting products carrying hydroxyl groups such as hydroxymethyl, will also react with the carboxylic anhydride to form ester groups; as is illustrated hereinafter it is possible to hydrolyse the ester group formed by treating the reaction mixture afterwards with hydrochloric acid so that the hydroxyl group is formed again. The exact working conditions of the method oF the invention are of course dependent on the nature of the starting material used and the optimum combination of temperature, pressure, amount of catalyst used and the reaction time. A hydrogen pressure of 1,000 to 1,500 psi generally suffices to obtain fast hydrogenation rates at temperatures comprised between 100 and 175* C. In many cases the hydrogen is readily absorbed at temperatures of 130140* C. Once the absorption of hydrogen ceases, the reaction mixture is cooled below the boiling temperature of the lower aliphatic carboxylic acid formed. The rhenium sulphide of use according to the present invention can be prepared by methods well known to those skilled in the art and described in literature. For instance rhenium(VII) sulphide can be prepared as described in J1.Am.Chem.Soc. 76, 151923(1954). The following preparations illustrate the method of the present invention. A method of preparing 2-alkylthiazoles or 2-alkylselenazoles is described wherein an aromatic disulphide or diselenide having amino groups or nitro groups in the 2-positions relative to the disulphide or diselenide group is catalytically hydrogenated using a rhenium sulphide as catalyst in the presence of an aliphatic carboxylic anhydride. The method is a one-step synthesis and high yields of 2-alkyl thiazoles or selenazoles are obtained having a high degree of purity. The present invention relates to a new method for the preparation of a 2-alkyl substituted thiazoles or selenazoles with fused-on aromatic group. As is known 2-alkyl-benzothiazoles, 2-alkyl-naphthothiazoles, 2alkyl-benzoselenazoles and 2-alkylnaphthoselenazoles are important heterocyclic bases for use in the preparation of methine dyes (see e.g., F.M. Hamer ''''The Cyanine Dyes and related compounds'''' Interscience Publishers 1964, New-York/London, and P.Glafkides, Photographic Chemistry, Vol. II, Chapter XXXVI, Fountain press, London), which are used amongst others as spectrally sensitizing agents for photosensitive systems such as photographic silver halide material and electrophotographic material. It has now been that 2-alkyl substituted thiazoles or selenazoles having a fused-on 6-carbon mononuclear or 10-carbon dinuclear aromatic ring can be prepared by catalytic hydrogenation under pressure of an aromatic disulphide or diselenide comprising in the 2-positions relative to the disulphide or diselenide group, amino groups or nitro groups, said hydrogenation taking place in the presence of an aliphatic carboxylic anhydride using as catalyst a rhenium sulphide, more particularly rhenium(VII)sulphide. The said aliphatic carboxylic anhydride may serve also as the reaction medium. The general one step synthesis of 2-alkyl substituted thiazoles or selenazoles having a fused-on 6-carbon mononulcear or 10carbon dinuclear aromatic ring according to the present invention is time-saving and gives high yields with a high degree of purity. Moreover, the method of the invention can be carried out very easily, even on an industrial scale without giving rise to technological difficulties. The rhenium sulphide used according to the present invention is not poisoned by the sulphur-containing starting products used in the method of the invention and cause no fission of the carbonsulphur bond, while being resistant to carboxylic anhydrides. The method of the invention can be represented by the following reaction scheme:

专利号:US-2010093880-A1
优先权日:2006-12-20
标 题:Recycling cleavage of polyurethanes
发明人：BERGFELD MANFRED; KIEFFER ANDREAS
权利人:BERGFELD MANFRED; KIEFFER ANDREAS
摘要:A process is described for splitting polyurethanes and polyurethaneureas, in which the polymer is first reacted with gaseous or liquid secondary aliphatic or cycloaliphatic amines, the secondary urea formed, after removal with hydrogen chloride, is split to the isocyanate, and the polyols or polyamines also formed in the reaction are worked up and purified. It is possible by the process according to the invention to work up polyurethanes, polyurethaneureas, etc., of any origin, and to break them down into the starting materials, specifically the isocyanates, polyols or polyamines, to form starting materials in very high quality, which can be reused for the synthesis of any polyurethanes or polyureas. The invention further provides for the preparation of secondary bis-ureas from polyurethanes or polyurethaneureas or/and ureas.

专利号:WO-2025004100-A1
优先权日:2023-06-26
标 题 :A crosslinker and carbon/glass fiber-reinforced epoxy composites therefrom
发明人：SAHOO SUSHANTA KUMAR; VIJAYAN ARYA; LAKSHMANAN VENKATASUBRAMANIAM; PUTHENPURACKAL RAVI RAJIMOL
权利人:COUNCIL SCIENT IND RES
摘要:The present invention relates to covalent network-based polymers derived from imine and disulphide based crosslinkers with the epoxy. The recyclability of the high-cost fibres is achieved by the synthesis of epoxy vitrimers based on dynamic imine and imine-disulphide bonds. Schiff base chemistry and condensation reaction are used to prepare the crosslinkers with imine linkages as well as imine-disulphide linkages. Various aromatic carbonyl compounds like divanillin, terepthaldehyde, vanillin, 4-hydroxy benzaldehyde, isatin etc. are used for the reaction with various aliphatic and aromatic amines like IPDA, 2-AFD, 4-AFD etc. The prepared epoxy vitrimers showed comparable thermal, mechanical and thermomechanical properties with the conventional DGEBA epoxy-amine system. The carbon/glass fiber-reinforced composite with the vitrimers showed superior mechanical properties beneficial for many engineering applications. The recycling of the vitrimers and composites can be achieved by simple immersion in a suitable solvent system with stirring or agitation at ambient temperature (30-60ºC) conditions. The fibers were easily recovered without losing their morphology, strength and structural integrity. With this invention, wastage of reinforcement carbon fibers and glass fibers can be minimized and the recovered fibers can be used for other applications with a circular economy approach.

专利号:US-4438250-A
优先权日:1979-01-23
标 题:Suspensions of isocyanato ureas in isocyanate prepolymers, a process for their production and their use in the production of high molecular-weight polyurethane plastics
发明人：GROEGLER GERHARD; GANSTER OTTO; RECKER KLAUS
权利人:BAYER AG
摘要:The invention is directed to suspensions of isocyanato ureas in isocyanate prepolymers; to a process for their production by reacting mixtures of aromatic diisocyanates containing isocyanate groups of different reactivities and prepolymers containing terminal isocyanate groups, with water; and to the use of the suspensions as synthesis components in the production of polyurethane plastics.

专利号:CN-107858700-B
优先权日:2017-10-31
标 题 :Electrochemical synthesis of 2-substituted benzothiazoles