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1.
P. K. Khanna 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4):951-955
Abstract The organic chemistry of 1,2,3-selenadiazoles has been explored to a greater extent due to the fact that the chemistry of 1,2,3-selenadiazoles mostly is driven by its facile decomposition via elimination of a nitrogen molecule and formation of selenaketocarben and/or its dimerization to 1,4-diselenin. The reactions of 1,2,3-selenadiazoles directly with various transition metal compounds have resulted in unique organo-selenium transition metal complexes. However, the materials chemistry of 1,2,3-selenadiazoles has not appeared in literature prior to the first publication on the subject from our laboratory in 2003. To, the best of our knowledge, no research group is engaged in such an activity. We, have exclusively explored the potential of 1,2,3-selenadiazoles for their effective utilization in synthesis of semiconductor nano particles or nano powder and in this lecture, the results and methodology for the same would be discussed. 相似文献
2.
Hatice Başpınar Küçük Zeynep Banu Salt Emel Mataracı Kara Aysema Sayık Mehan Ayşe Sergüzel Yusufoğlu 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):903-908
AbstractA series of novel 1,2,3-thiadiazoles and 1,2,3-selenadiazoles having a long alkyl chain were synthesized by reacting semicarbazones with SOCl2 and SeO2, respectively. The structures of the target compounds 5–12 were confirmed by spectroscopy (IR, 1H NMR, 13C NMR, and MS) and elemental analysis. Their antibacterial and antifungal activities were evaluated against six bacteria (Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, Proteus mirabilis, Enterococcus faecalis, Staphylococcus epidermidis, Staphylococcus aureus) and three fungi (Candida albicans, Candida parapsilosis, Candida tropicalis). The results of bioassays indicated that the compounds 5-Dodecyl-4-(4-methoxy-phenyl)-[1-3]selenadiazole (7), 4-Methyl-5-tetradecyl-[1-3]selenadiazole (8) and 5-Dodecyl-4-(4-methoxy-phenyl)-[1-3]thiadiazole (11) displayed moderate antibacterial activity against S. Epidermidis. On the other hand, according to antifungal screening results, compounds 5-Dodecyl-4-phenyl-[1-3]selenadiazole (5), 4-p-Tolyl-5-undecyl-[1-3]selenadiazole (6), and 5-Dodecyl-4-(4-methoxy-phenyl)-[1-3]selenadiazole (7) exhibited significant antifungal activities studied yeast strains. 相似文献
3.
《Mendeleev Communications》2020,30(3):276-278
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4.
N. G. Khusainova O. A. Mostovaya M. A. Khusainov S. A. Slivko 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-3):45-47
Abstract Reaction of 2-acetyl-5-methyl-2H-1,2,3-diazaphosphole with ethane-1,2-dithiol at ?30°C leads to the formation of 2-acetyl-3-(β-mercaptoethylthio)-5-methyl-1,2,3-diaza-phospholene. On heating, this product forms 2-(β-mercaptoethylthio)-1,3,2-dithia-phospholane, 1,2-bis(1,3,2-dithiaphospholanyl)-dithioethane, and N-acetyl-N′-isopropilidene-hydrazine. 相似文献
5.
T. V. Glukhareva L. V. Dyudya Yu. Yu. Morzherin A. V. Tkachev V. A. Bakulev 《Chemistry of Heterocyclic Compounds》2003,39(1):126-127
The treatment of 5-hydrazono-1,2,3-thiadiazoles by phosphorus pentachloride in toluene or xylene leads to an anomalous Dimroth rearrangement and the reaction of the mercapto function formed with the methyl group of the solvent to give 5-benzylmercapto-1,2,3-triazole. 相似文献
6.
《Journal of Coordination Chemistry》2012,65(1):169-176
Abstract The formation of two complexes by reaction of [PdCl4]2- with 1,2,3-triphenylguanidine (PhNH)2C=NPh under different metal/ligand ratios has been observed and the structure of the complex [(1,2,3-triphenylguanidine)2PdCl2] has been determined by X-ray diffraction methods. The ligands are coordinated as neutral monodentate molecules to the metal centre through their imine nitrogen atoms. The second Pd(II) complex is [Pd(1,2,3-triphenylguanidine)4]2+ and was isolated by precipitation with ClO? 4. 相似文献
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R. B. King 《Russian Chemical Bulletin》1993,42(8):1283-1291
Methods derived from topology and graph theory indicate that the deltahedral boranes B
n
H
n
2– and the corresponding carboranes C2Bn–2H
n
(6 n 12) may be regarded as three-dimensional delocalized aromatic systems in which surface bonding and core bonding correspond to -bonding and -bonding, respectively, in planar polygonal two-dimensional hydrocarbons CinnH
n
(n–6)+ (n=5/7). The two extreme types of topologies which may be used to model core bonding in deltahedral boranes and carboranes are the deltahedral (D
n
) topology based on the skeleton of the underlying deltahedron and the complete (K
n
) topology based on the corresponding complete graph. Analyses of the Hoffmann-Lipscomb LCAO extended Hückel computations, the Armstrong—Perkins—Stewart self-consistent molecular orbital computations, and SCF MOab initio GAUSSIAN-82 computations on B6H6
2– indicate that the approximation of the atomic orbitals by the sum of the molecular orbitals, as is typical in modernab initio computations, leads to significantly weaker apparent core bonding approximated more closely by deltahedral (D
n
) topology than by complete (K
n
) topology.This work was presented at the Workshop The Modern Problems of Heteroorganic Chemistry sponsored by the A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences (May 8–13, 1993).Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1353–1360, August, 1993. 相似文献
9.
P. Arsenyan K. Oberte K. Rubina S. Belyakov E. Lukevics 《Chemistry of Heterocyclic Compounds》2004,40(4):503-506
Nucleophilic attack of tributyl- and triphenylphosphines on 4-phenyl- and 5-ethoxycarbonyl-4-methyl-1,2,3-selenadiazoles leads to the quantitative formation of selenophosphoranes and substituted acetylenes. The molecular structure of 4-phenyl-1,2,3-selenadiazole was confirmed by X-ray crystallography. 相似文献
10.
Macropolyhedral borane clusters are concave polyhedra constituting fused convex simple polyhedra. They are formally obtained by condensation of simple polyhedral boranes under elimination of between one and four BH(3) or isoelectronic units. The number of eliminated vertexes from simple polyhedra equals the number of shared vertexes in macropolyhedral boranes. For each of the eight classes with general formulae ranging from B(n)H(n-4) to B(n)H(n+10), more than one structure type is possible, differing in the number of shared vertexes and in the types of the two combined cluster fragments. However, only one type of "potential structures" is represented by experimentally known examples and is found to be favored by theoretical calculations. A sophisticated system exists among the favored macropolyhedral borane structures. For each class of macropolyhedral boranes, the number of skeletal electron pairs is directly related to the general formula, the number of shared vertexes and the type of fused cluster fragments. In order to predict the distribution of vertexes among the fused fragments, we propose the concept of preferred fragments. Preferred fragments are those usually present in the thermodynamically most stable structure of a given class of macropolyhedral boranes and are also frequently observed in the experimentally known structures. This allows us to completely predict the cluster framework of the thermodynamically most stable macropolyhedral borane isomers. 相似文献
11.
Using density functional theory, the generalized gradient approximation for the exchange‐correlation potential and Møller–Plesset perturbation theory we study the hydrogen uptake of Li‐ and Mg‐doped boranes. Specifically, we calculate the structures and binding energies of hydrogen molecules sequentially attached to LiB6H7, LiB12H13, Li2B6H6, Li2B12H12, MgB6H6, and MgB12H12. Up to three H2 molecules can be bound quasi‐molecularly to each of the metal cations with binding energies per H2 molecule ranging between 0.07 eV and 0.27 eV. The corresponding gravimetric densities lie in the range of 3.49 to 12 wt %, not counting the H atoms bound chemically to the B atoms. 相似文献
12.
Nishiyama Y Hada Y Anjiki M Miyake K Hanita S Sonoda N 《The Journal of organic chemistry》2002,67(5):1520-1525
It was found that the reaction of 1,2,3-selenadiazoles derived from cyclic ketones with olefins or dienes was markedly promoted by a catalytic amount of tributylstannyl radical, which was generated in situ from tributylstannyl hydride or allyltributylstannane and AIBN, to give the corresponding dihydroselenophenes in moderate to good yields. In contrast, when 1,2,3-selenadiazoles prepared from linear and aromatic ketones were used as substrates, the same reaction did not take place, and alkynes were formed as the sole product. 相似文献
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14.
With cheap and easily available 1,2,3-thiadiazol-5-amine and amines as raw materials, cheap and reusable selenium as the catalyst, CO as the carbonylation reagent and O2 as the oxidizing agent, the selenium-catalyzed oxidative carbonylation reaction of 1,2,3-thiadiazol-5-amine can proceed smoothly with a series of amines in one-pot manner in the presence of triethylamine, affording 1,2,3-thiadiazol-5-ylureas mostly in moderate to good yields. 相似文献
15.
Udo Rohde Hendrik Wilkens Rainer Streubel 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):545-548
Abstract: New lH-diphosphirene and 2,3-dihydro-l,2,3-triphosphete tungsten complexes have been synthesized, by thermal decomposition of different 2H-azaphosphirene complexes in the presence of various phosphaalkynes. Novel phosphorus-carbon cage complexes were obtained, if a pentamethylcyclopentadienyl-substituted 2H-azaphosphirene complex and alkyl-substituted phosphaalkynes were employed. 相似文献
16.
A small library of diverse N-unsubstituted 1,2,3-triazoles was prepared from the corresponding 1-sulfonyl-1,2,3-triazoles, which were treated only with MeOH at reflux temperature. This process was carried out in good yields showing high efficiency and good functional group tolerance. 相似文献
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19.
A series of 1-(2-arylethynylselenomercapto)-2,3-epoxypropane and 1,3-di(2-arylethynylselenomercapto)-2-propanol were synthesized starting from 1,2,3-selenadiazoles and epichlorohydrin. 相似文献