排序方式: 共有69条查询结果,搜索用时 15 毫秒
1.
《Mendeleev Communications》2022,32(1):126-128
3-Aryl-5-methylidene-2-thiohydantoins were constructed in one-pot reaction of aryl isothiocyanates and 3-morpholino- alanine in alkaline medium with the subsequent treatment with boiling hydrochloric acid. 相似文献
2.
Giorgio Abbiati Alessandro Cirrincione de CarvalhoElisabetta Rossi 《Tetrahedron》2003,59(37):7397-7402
The cycloaddition reactions of 1-p-tolyl and 1-benzyl- 2,4-diphenyl-1,3-diazabuta-1,3-dienes with a variety of aryl and alkyl isocyanate and isothiocyanate are described. The reaction mechanism is also discussed. 相似文献
3.
A. M. Demchenko V. A. Yanchenko V. V. Kisly M. S. Lozinskii 《Chemistry of Heterocyclic Compounds》2005,41(5):668-672
We have developed a method for synthesis of aryl isothiocyanates by means of thiocarbamoylation of aromatic amines by tetramethylthiuram disulfide followed by degradation of the intermediate N(1)-aryl-N,N-dimethylthiourea by concentrated HCl. We have shown that thiocarbamoylation of 4-amino-5-ethyl-4H-1,2,4-triazole-3-thiol occurs at the 2 position of the triazole ring, while thiocarbamoylation of 4-amino-3-methyl-6-phenyl-4,5-dihydro-1,2,4-triazin-5-one leads to the dihetaryl-substituted thiourea. We consider the possibility of using N(1)-aryl-N,N-dimethylthioureas as analogs of isothiocyanates in reactions with N-nucleophiles.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 775–780, May, 2005. 相似文献
4.
D. L. Lipilin A. Yu. Tyurin O. Yu. Smirnov A. M. Churakov Yu. A. Strelenko V. A. Tartakovsky 《Russian Chemical Bulletin》2006,55(7):1239-1242
Treatment of 2-(tert-butyl)-1,2,3,4-benzotetrazinium tetrafluoroborates with sodium thiocyanate afforded 2-(tert-butylazo)phenyl isothiocyanates 3, which exist in equilibrium with 2-(tert-butyl)-1,2,4-benzotriazine-3(2H)-thiones 3′. The equilibrium depends on the substituents R in the benzene ring: the percentage of the open isomer 3 is about 20% for R = H or Me; for R = Cl or Br, the equilibrium is completely shifted to cyclic isomer 3′. The equilibrium is slow on the time scale of the 1H and 13C NMR experiments. For compounds 3a/3′a (R = H), the spectra at 24 °C show two sets of signals, while those at 0 °C contain only signals for isomer 3′a.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1192–1195, July, 2006. 相似文献
5.
An efficient, green, and facile method has been developed for the synthesis of benzazole and thiourea analogues from naturally occurring erucin in moderate to good yields. The reaction was carried out in water without using any metal catalyst or base. The present method tolerated the various functional groups on aromatic rings and also applicable for other isothiocyanates. 相似文献
6.
7.
Raoudha Abderrahim Khaled Boujlel 《Phosphorus, sulfur, and silicon and the related elements》2013,188(5):995-999
The imidates derived from 3-aminotriazole 1 react with isocyanates and isothiocyanates to give corresponding 1,2,4-triazolo-1,3,5-triazin-4-ones and 1,2,4-triazolo-1,3,5-triazin-4-thiones in a 60–75% overall yield. If the condensation is realized at r.t., then the intermediate 2 can be isolated. 相似文献
8.
Jerzy Zakrzewski Maria Krawczyk 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1880-1903
Thio and seleno analogs of fenuron, isoproturon, chlorotoluron, metoxuron, monuron, and diuron were synthesized from the corresponding aryl amines. Their reaction with thiophosgene leads to isothiocyanates. Aryl amines were also converted (via isocyanides) to isoselenocyanates. The reaction of both isothio- and isoselenocyanates with dimethylamine affords the corresponding thio and seleno analogs of the above-mentioned urea herbicides. Herbicidal activity of the synthesized compounds was slightly lower than the activity of the parent urea herbicides. The thio and seleno analogs as well as the parent ureas showed good fungicidal activity at a concentration of 200 ppm against selected fungi. 相似文献
9.
Darrell J. Spells Christopher Lindsey Larry R. Dalton Shin-Tson Wu 《Liquid crystals》2013,40(12):1529-1532
Methods for synthesizing substituted alkyl and fluoro stilbene-tolane (PTPDP) liquid crystal materials are presented. These compounds show a slightly higher birefringence than the analogous bistolanes, but higher melting points and heats of fusion. Potential applications of these compounds for optical communications and displays are discussed. 相似文献
10.
<正>NMR spectra were recorded in CDCl3 or DMSO-d6 on a Bruker Avance 400 operating at 400 MHz with TMS as internal standard. 1H-benzo[d]imidazol-2(3H)-one(3aa) [1]: 1H NMR(400 MHz, DMSO-d6) δ 10.5(s, 2 H, NH), 6.90(s, 4H)(aromatic CH). 13 C NMR(400 MHz, DMSO-d6) δ 155.7, 130.1, 120.9, 108.9. NH HN O3 aa 1-(2-Aminophenyl)-3-phenylurea(3aa′) [2]: 1H NMR(400 MHz, DMSO-d6) δ 8.75(s, 1H), 7.71(s, 1H)(CONH), 7.44(d, J = 8.0 Hz, 2H), 7.33(d, J = 7.8 Hz, 1H), 7.26(t, J = 7.7 Hz, 2H), 6.94(t, J = 7.4 Hz, 1H), 6.84(t, J = 7.4 Hz, 1H), 6.74(d, J = 7.8 Hz, 1H), 6.57(t, J = 7.4 Hz, 1H)(aromatic CH), 4.78(s, 2H)(NH2). 13 C NMR(400 MHz, DMSO-d6) δ 153.6, 141.4, 140.6, 129.2, 125.2, 124.8, 124.2,121.9, 118.4, 117.3, 116.4. 相似文献