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1.
Dzhemilev U. M. Ibragimov A. G. Khafizova L. O. Khalilov L. M. Vasil"ev Yu. V. Tomilov Yu. V. 《Russian Chemical Bulletin》2001,50(2):297-299
1-Ethyl-2,3-fullerenoaluminacyclopropanes (EtAl)n(2-C60) were synthesized by the reaction of fullerene C60 with an excess of EtAlCl2 in the presence of Mg and using Cp2TiCl2 as the catalyst in a THF--toluene solution at 20 °C. Deuterolysis of fullerenoaluminacyclopropanes afforded a mixture of deuteriofullerenes C60Dm, where m = 6--12. 相似文献
2.
Rusakov S. V. Khalilov L. M. Parfenova L. V. Ibragimov A. G. Ponomarev O. A. Dzhemilev U. M. 《Russian Chemical Bulletin》2001,50(12):2336-2345
Cyclometallation of olefins with AlEt3 in the presence of Cp2ZrCl2 affording five-membered monosubstituted cyclic organoaluminum compounds, was studied by the semiempirical quantum-chemical PM3 method. The proposed model of catalytic cycloalumination of styrene catalyzed by Cp2ZrCl2 is in a good accordance with experimental data obtained by dynamic NMR spectroscopy. 相似文献
3.
Khafizova L. O. Ibragimov A. G. Gil"fanova G. N. Khalilov L. M. Dzhemilev U. M. 《Russian Chemical Bulletin》2001,50(11):2188-2192
Catalytic cycloalumination of 1-alkyl(phenyl)allenes with triethylaluminum (5 mol.% of Cp2ZrCl2 as the catalyst, 20 °C, 4 h, hexane) afforded methylene- and alkyl(benzyl)idene-substituted alumacyclopentanes. 相似文献
4.
研究了双取代乙炔在二茂二氯化钛存在下被异丁基溴化镁格氏试剂还原生成烯烃的过程. 结果表明, 二苯乙炔还原后几乎得到专一的Z-二苯乙烯, 但多数炔烃还原后主要产物为E式烯烃, Z,E异构体的比例与底物炔烃的性质及位阻有关. 本文还报导了以双取代乙炔为底物, 径钛氢化反应合成了9组烯烃异构体混合物, 并对其结构进行了分析鉴定. 相似文献
5.
A. G. Ibragimov L. O. Khafizova K. G. Satenov L. M. Khalilov L. G. Yakovleva S. V. Rusakov U. M. Dzhemilev 《Russian Chemical Bulletin》1999,48(8):1574-1580
The Cp2ZrCl2-catalyzed reaction of arylolefins (styrene,o- andp-methylstyrenes,trans-stilbene, 1,4-diphenyl-1,3-butadiene) with AlEt3 resulting in mono- and disubstituted alumacyclopentanes and substituted alumacyclopropanes was studied. The yield and ratio of cyclic organoaluminum compounds depend on the structure of the initial arylolefins and conditions of cycloalumination. 相似文献
6.
U. M. Dzhemilev A. G. Ibragimov I. R. Ramazanov M. P. Luk'yanova A. Z. Sharipova L. M. Khalilov 《Russian Chemical Bulletin》2000,49(6):1086-1089
A regioselective method for the synthesis of 1,1-dialkylcyclopropanes was developed. The method is based on the reaction of
2,3-dialkyl-1-ethylalumacyclopent-2-enes with an excess of dialkyl sulfates (Me2SO4 or Et2SO4). A plausible reaction mechanism was suggested.
For Part 20, see Ref. 1.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1092–1095, June, 2000. 相似文献
7.
Vladimir A. D'yakonov Aleksey A. Makarov Askhat G. Ibragimov Leonard M. Khalilov Usein M. Dzhemilev 《Tetrahedron》2008,64(44):10188-10194
High-yield (>80%) catalytic intermolecular cyclomagnesiation of cyclic and acyclic allenes with the aid of Grignard reagents has been realized in the presence of Cp2TiCl2. The synthesized unsaturated bi- and tricyclic organomagnesium compounds (OMC) have been successfully converted in situ into thiophenes, unsaturated ketones, cyclic and acyclic hydrocarbons with high regio- and stereoselectivity. 相似文献
8.
Processes of direct and electrocatalytic (in the presence of electrochemically reduced Cp2TiCl2) reduction of three α-bromoketones containing the C(sp3)-Br or C(sp2)-Br bond, viz., 2-bromo-and 2,6-dibromo-4,4-dimethylcyclohexa-2,5-dien-1-ones and α-bromo-acetophenone, were studied by cyclic voltammetry
and preparative electrolysis. In all cases, the dissociative electron transfer proceeds via the concerted mechanism. Preparative electrolysis of these α-bromoketones in the presence of Cp2TiCl2 affords the reductive debromination products in 40–80% yield at low cathodic potentials (−0.85 V vs. Ag/AgCl/KCl). In the case of 2,6-dibromo-4,4-dimethylcyclohexa-2,5-dien-1-one in the potentiostatic regime, only one bromine
atom can be eliminated selectively.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 977–983, May, 2007. 相似文献
9.
《Tetrahedron letters》1987,28(33):3815-3816
Isocyanates react with isopropyl or sec-butylmagnesium bromide in the presence of a small amount of Cp2TiCl2 to afford amides with normal alkyl group. A possibl mechanism for this reaction is proposed. 相似文献
10.
11.
Diaryl ketones react with Grignard reagents in the presence of a catalytic amount of Cp2 TiC1 2 to give the corresponding pinacolic coupling products. 相似文献
12.
《Tetrahedron letters》1988,29(6):651-652
Phenylisocyanate and phenylthioisocyanate react with Grignard reagents in the presence of a small amount of Cp2TiCl2 at room temperature to afford reduction-coupling products, N-methyl-N, N′-diphenylurea and N-methyl-N, N′-diphenylthiourea. 相似文献
13.
A new ligand, Cp*CH2PPh2 (Cp* = 1,2,3,4,5-pentamethyl-2,4-cyclopentadienyl), was prepared, and was used as a ligand for nickel-catalysed cross-coupling reaction of alkyl halides with aryl Grignard reagents, which nickel-phosphine complexes had never made possible. 相似文献
14.
V. A. D’yakonov R. K. Timerkhanov T. V. Tyumkina U. M. Dzhemilev 《Russian Chemical Bulletin》2009,58(12):2456-2464
Catalytic intermolecular cycloalumination of cyclic 1,2-dienes with terminal allenes or disubstituted acetylenes mediated
by EtAlCl2 in the presence of complexes based on transition metals was accomplished. The yield of unsaturated bicyclic aluminacarbocycles
was up to 85%. 相似文献
15.
The reaction of Grignard reagents with ketones or aldehydes in the presence of a catalytic amount of Cp2TiCl2 leads to the corresponding reduction products in high yields. Cp2TiH intermediate was proposed to account for this observation. 相似文献
16.
V. A. D’yakonov A. A. Makarov E. Kh. Makarova T. V. Tyumkina U. M. Dzhemilev 《Russian Chemical Bulletin》2012,61(1):158-164
Catalytic cyclomagnesiation of N-containing 1,2-dienes with Et2Mg in the presence of the Zr-based complexes affords 2-(aminoalkylidene)magnesacyclopentanes in 68–84% yields. 相似文献
17.
Peter Očenáš Lucia Tomášová Peter Kutschy Pavel Pazdera Ján Mojžiš Martina Pilátová 《Chemical Papers》2013,67(6):631-642
The anti-cancer properties of naturally occurring (2R, 3R)-(?)-1-methoxyspirobrassinol methyl ether (I) and their synthetic amino or piperidyl analogues II inspired us to study the synthesis of new target compounds III with a C—C bond in the 2-position of indole rather than a C—N or C—O bond (I or II respectively). The goal was achieved via electrophilic-nucleophilic 3,2-difunctionalisation of 1-methoxybrassinin (IV) in the presence of bromine and the Grignard reagent leading to the formation of cis- and trans-C—C analogues of I. Finally, the anti-cancer activities of the new compounds were measured and compared with I and II in order to show the importance of a heteroatom in the 2-substituted indole on the anti-cancer activity of spirobrassinols. 相似文献
18.
1. | The (Cp2TiCl)2-LiAlH4 system with Al/Ti from 0.25 to 1.5 catalyzes both the homogeneous hydrogenation and isomerization of allylbenzene. |
2. | In an argon atmosphere, allylbenzene is isomerized to trans-propenylbenzene with 90–92% selectivity when Al/Ti=1–1.5. |
3. | The possibility was demonstrated for reactivation of this catalytic system by its retreatment with LiAlH4. |
19.
The Cp2ZrCl2-catalyzed cyclometallation of ??,??-alkadiynes upon the action of RMgR?? or R n AlCl3?n was accomplished to yield unsaturated di- and tricyclic (magnesa)aluminacarbocycles in up to 85% yield. 相似文献
20.
Dzhemilev U. M. Ibragimov A. G. Ramazanov I. R. Luk'yanova M. P. Sharipova A. Z. 《Russian Chemical Bulletin》2001,50(3):484-487
Cp2ZrCl2-Catalyzed cycloalumination of asymmetrical alkyl-, phenyl-, and allyl-substituted acetylenes under the action of Et3Al was studied. The reactions afforded regioisomeric 2,3-disubstituted aluminacyclopent-2-enes whose yields and ratio depend on the nature of the substituents in the starting acetylenes. 相似文献