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Electrophilic amination of primary amines with N-(dietho-xyphosphoroyl)-O-(p-nitrophenylsulfonyl)-hydroxylamine 1, followed by dephosphorylation of the phosphorohydrazidate 2 with p-toluenesulfonic acid monohydrate in ethanol, represents a novel approach to monoalkylhydrazines. 相似文献
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A convenient preparation of resorcinol derivatives from α-phenylsulfinyllactones and α, β-unsaturated ketones is described. 相似文献
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Romuald Bartnik Dariusz Cal 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):1858-1861
The regioselective synthesis of 3-diethoxyphosphonopyrazoles has been accomplished through the addition of aryl or alkyl hydrazines to (3-ethoxyacryloyl)phosphonic acid diethyl ester. An example of hydrolysis of the pyrazolephosphonic ester to the corresponding acid is described. 相似文献
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Frank J. Feher Daravong Soulivong Frank Nguyen Joseph W. Ziller 《Angewandte Chemie (International ed. in English)》1998,37(19):2663-2666
The substitution of an O atom in the Cy8Si8O12 framework by a heteroatom or a heteroatom-containing group (Z) provides a simple route to discrete heterosilsesquioxane frameworks 1 . In this reaction the Cy8Si8O12 framework is initially opened with triflic acid and then treated with different nucleophiles (Cy=cyclohexyl; Z=NPh, SO4, nBuBO2, CrO4). 相似文献
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M. Sc. Thomas G. Müller Dr. Friedrich Karau Prof. Dr. Wolfgang Schnick Priv.‐Doz. Dr. Florian Kraus 《Angewandte Chemie (International ed. in English)》2014,53(50):13695-13697
Beside several other applications, metal azides can be used for the synthesis of nitridophosphates and binary nitrides. Herein we present a novel synthetic access to azides: Several metals, such as main‐group, transition metals, and rare‐earth metals, react with silver azide in liquid ammonia as a solvent giving the corresponding metal azides. In this work Mn(N3)2, Sn(N3)2, and Eu(N3)2, as well as their ammonia complexes were synthesized for the first time through low‐temperature methods. Also a simpler access to Zn(N3)2 was possible. At room temperature and the respective vapor pressure of NH3, it became possible to grow single crystals of the dinuclear holmium azide [Ho2(μ‐NH2)3(NH3)10](N3)3?1.25 NH3. We are confident that this new route could lead to novel metal azides as well as nitrides of the main‐group, the transition, and the rare‐earth metals upon careful decomposition. 相似文献
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Shagun L. G. Shagun V. A. Ermolyuk L. P. Sarapulova G. I. Voronkov M. G. 《Russian Journal of Organic Chemistry》2003,39(10):1501-1506
The reaction of 2-chloro-1-phenylethane-1,1-dithiol with hydrazine gave an unexpected product, 2-hydrazono-1-phenylethane-2,2-dithiol, which underwent intramolecular ring closure to 5-phenyl-4,5-dihydro-1,2,3-thiadiazole in 69% yield. Elementary steps of the process were studied by quantum-chemical methods, and their kinetic and thermodynamic parameters were determined. 相似文献
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Indenones are useful intermediates in the synthesis of several natural products, e.g. gibberellins (1) and steroid hormones with a C-nor-D-home system (2). Despite the nernerous methods for indenone synthesized, or the yields was much lower as mentioned in earlier reports (1)(4). One of the difficulties of the usual methods is the required electrophilic cyclization meta to a methoxyl substiruent. House (5) deals with these difficulties in more detail. In our method the synthesis of 6-methoxyinde-nones is effected by substitution dara to methoxyl function. 相似文献
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The phosphonic acids and their esters, which are more resistant to hydrolysis than phosphates, could find wide application in biochemistry as regulators for metabolic processes1. 相似文献
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5-Isoxaz0lamineshavebeenusedasintermediatesforthesynthesis0fderivatives0fantihistaminic,analgetic,antibacterial,insecticidal,herbicidalandfungicidalactivity'.Usuallytheyaresynthesizedbytheintramolecularcondensation0fhydr0xylamineand0-nitrilegr0up'.Otherapproaches,suchasreductivecyclizati0nofZ-a-cyano-6-nitroethylenesandIithiumaIuminumhydridereduction0f3-cyanooxazoleshaveals0beenrepoFted'-'.HerewerepoFtanewsyntheticrouteofthesecompounds.Ohn0andNaruse7havereportedthatthereactionof2-chlorocycl… 相似文献