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41.
42.
Applying the ligand electrochemical parameter approach to sandwich complexes and standardizing to the Fe(III)/Fe(II) couple, we obtained E(L)(L) values for over 200 pi-ligands. Linear correlations exist between formal potential (E degrees ) and the summation operatorE(L)(L) for each metal couple. In this fashion, we report correlation data for many first row transition metal couples. The correlations between the E(L)(L) of the substituted pi-ligand and the Hammett substituent constants (sigma(p)) are also explored. 相似文献
43.
K.P. Butin V.V. Strelets I.F. Gunkin I.P. Beletskaya O.A. Reutov 《Journal of organometallic chemistry》1975,85(2):123-130
Substituted diphenylthallium chlorides, (XC6H4)2T1C1 (X = p-OCH3, p-CH3, m-CH3, H, p-Cl, p-CH3COO) have been prepared. Polarography and chronopotentiometry were used for study of electrochemical reduction and interaction of these compounds with mercury metal. Intermetallic cations, ArTl+HgAr, were shown to be intermediates in the transmetallation reaction between Ar2Tl+ and mercury metal: 相似文献
44.
Yu. I. Akulin M. M. Gel'mont B. Kh. Strelets L. S. Éfros 《Chemistry of Heterocyclic Compounds》1978,14(7):733-737
A number of benzo-1,2,3-dithiazolium chlorides (I) and their selenium analogs — benzo-1,2,3-thiaselenazolium, benzo-2,1,3-thiaselenazolium, and benzo-1,2,3-diselenazolium salts — were synthesized. The electronic structures and reactivities of the I cation and salts I–IV are discussed on the basis of a quantum-chemical calculation of cation I and the PMR spectra of salts I–IV. Successive substitution of the sulfur atoms in the I cation by selenium atoms, particularly in the 2 position, substantially increases the degree of transfer of positive charge to the condensed benzene ring. The trend of the nucleophilic reactivities of 6-methoxy derivatives of salts I–IV in the reaction with aromatic amines is the same as the trend of the degree of localization of the positive charge in the 6 position.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 912–916, July, 1978. 相似文献
45.
G. V. Loukova O. N. Babkina T. A. Bazhenova N. M. Bravaya V. V. Strelets 《Russian Chemical Bulletin》1990,49(1):60-63
The reduction in THF and oxidation in CH2Cl2 of the bent-sandwich complex (η5-lnd)2ZrMe2 (1) (Ind=C9H7, indenyl) were studied by cyclic voltammetry. Complex1 in THF undergoes one-electron reduction to radical anion1
−, which partially decomposes with the liberation of the Ind− anion. Even at −45°C the one-electron oxidation leads to the formation of an unstable 15-electron radical cation undergoing
fast heterolytic decomposition to the Me• radical and (η5-lnd)2ZrMe2 cation, which is the key reaction center in the catalytic polymerization of olefins. Comparative analysis of electron-transfer-induced
transformations of bent-sandwich dimethyl and dichloride zirconocenes of the general formula L2ZrX2 (L=η5-lnd, η5-Cp: X=Xl, Me) was performed.
The material of the paper was first reported at the 195th Meeting of the Electrochemical Society (see Ref. 1).
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 59–62, January, 2000. 相似文献
46.
The reaction of m-substituted anilines with sulfur monochloride has been studied. It has been shown that cyclization with the formation of 1, 3, 2-benzothiazathiolium compounds takes place in the position para to the substituent. The introduction of methoxy groups into o-nitroanilines interferes with the displacement of the nitro group by the chlorine atom. A nucleophilic reaction mechanism has been proposed according to which the nitro group is displaced after the formation of the thiathioniaazine ring. 相似文献
47.
48.
V. V. Yanilkin Yu. G. Budnikova Yu. M. Kargin E. I. Gritsenko V. V. Strelets 《Russian Chemical Bulletin》1990,39(6):1149-1152
The electrolytic reduction of triphenyl phosphate proceeds with the participation of tetrabutylammonium cations with the formation of butyl diphenyl phosphate in DMF. It was concluded that the step involving electron transfer to the triphenyl phosphate molecule has retarded character.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1279–1283, June, 1990. 相似文献
49.
N. M. Bravaya V. V. Strelets Z. M. Dzhabieva O. N. Babkina V. P. Maryin 《Russian Chemical Bulletin》1998,47(8):1491-1497
Comparative analysis of catalytic activity of substituted bis(cyclopentadienyl)zirconium dichlorides with the general formula (R n Cp)2ZrCl2 (Cp2ZrCl2, (MeCp)2ZrCl2, (PriCp)2ZrCl2, (Pri 2Cp)2ZrCl2, (BunCp)2ZrCl2, (BuiCp)2ZrCl2, (ButCp)2ZrCl2, Cp* 2ZrCl2 (Cp*=Me5C5), (Me3SiCp)2ZrCl2, (cyclo-C6H11Cp)2ZrCl2, and [(cyclo-C6H11)2Cp]2ZrCl2) in ethene polymerization using polymethylalumoxane as the cocatalyst was performed. The molecular mass characteristics of the polyethylene samples obtained were determined. A linear correlation of the specific activity of the catalysts and the turnover number with the electronic and steric characteristics of substituents at the Cp ring of the complexes was established for the first time. Analysis of the polymerization kinetics and the obtained correlation between the specific activity of the complexes and molecular mass characteristics of the polyethylene samples suggest that alkyl substituents participate in reactions responsible for the restriction of the polymer chain growth and regeneration of the active center. These interactions most likely involve associates of AlMe3 with polymethylalumoxane molecules. 相似文献
50.
Rakova O. A. Sanina N. A. Shilov G. V. Strelets V. V. Borzova I. B. Kulikov A. V. Aldoshin S. M. 《Russian Journal of Coordination Chemistry》2001,27(9):657-663
The [n-Bu4N]2[Fe2(-S2O3)2(NO)4] complex was studied using X-ray diffraction analysis, cyclic voltammetry, and EPR spectroscopy, and its crystal structure was determined. The redox properties of the [Fe2(-S2O3)2(NO)4]2–anion in CH3CN and CH2Cl2solutions were studied. An addition of excess reducer (sodium thiosulfate) to the thiosulfate complex was shown to produce an EPR signal with g= 2.03 typical of the mononuclear iron dinitrosyl complexes. The mechanism for [Fe2(-S2O3)2(NO)4]2–reduction was suggested. 相似文献