764-41-0Relevant articles and documents
Structural features of catalytically active oligoorganometallosiloxanes
Levitsky,Kokorin,Smirnov,Karpilovskaya,Kadryashov,Nevskaya,Golubeva
, p. 1892 - 1895 (1998)
Copper- and (copper,aluminum)-containing organosiloxanes were studied by spectroscopic methods. It was found that in organometallosiloxanes (OMS) with an increased content of copper (Si/Cu = 1 : 1), Cu atoms are rather uniformly distributed in the siloxane matrix. All compounds under study are complexes characterized by d - d-transitions in copper ions with a constant coordination number of the metal atom. The intensity of the d - d-transition band increases as the copper content increases. ESR studies demonstrated that in the compounds under consideration, a change from mononuclear paramagnetic centers to clusters, in which copper ions are linked by strong spin-exchange interactions, occurs as the copper content increases. The catalytic activity of the above-mentioned compounds in isomerization reactions of 3,4-dichlorobutene-1 was studied. It was found that copper atoms serve as catalytic centers.
Highly selective ruthenium metathesis catalysts for ethenolysis
Thomas, Renee M.,Keitz, Benjamin K.,Champagne, Timothy M.,Grubbs, Robert H.
experimental part, p. 7490 - 7496 (2011/06/27)
N-Aryl,N-alkyl N-heterocyclic carbene (NHC) ruthenium metathesis catalysts are highly selective toward the ethenolysis of methyl oleate, giving selectivity as high as 95% for the kinetic ethenolysis products over the thermodynamic self-metathesis products. The examples described herein represent some of the most selective NHC-based ruthenium catalysts for ethenolysis reactions to date. Furthermore, many of these catalysts show unusual preference and stability toward propagation as a methylidene species and provide good yields and turnover numbers at relatively low catalyst loading (500 ppm). A catalyst comparison showed that ruthenium complexes bearing sterically hindered NHC substituents afforded greater selectivity and stability and exhibited longer catalyst lifetime during reactions. Comparative analysis of the catalyst preference for kinetic versus thermodynamic product formation was achieved via evaluation of their steady-state conversion in the cross-metathesis reaction of terminal olefins. These results coincided with the observed ethenolysis selectivities, in which the more selective catalysts reach a steady state characterized by lower conversion to cross-metathesis products compared to less selective catalysts, which show higher conversion to cross-metathesis products.
AN IMPROVED PROCESS FOR THE PREPARATION OF 2,3,-DICHLORO 1,3,BUTADIENE FROM 1,3 BUTADIENE
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Page/Page column 6, (2011/06/16)
The present invention relates to an improved process for the production of 2,3-Dichloro 1,3-Butadiene which comprises Chlorinating Butadiene, in liquid phase, in the presence of chlorinated solvents and phase transfer catalyst, Distilling the solvent, Distilling the formed 3,4-dichlorobutene-1, 1,4-dichlorobutene-2; and 1,2,3,4-Tetrachlorbutane; under reduced pressure,chlorinating the separated 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 to give 1,2,3,4-Tetrachlorobutane.,double Dehydrochlorinating the 1,2,3,4-Tetrachlorobutane using methanol,alkali and inhibitors under atmosphere of 1% oxides of nitrogen in nitrogen atmosphere the total period of Dehydrochlorinating being in the range of 15-33 hours to give 2,3-Dichloro 1,3-Butadiene and separating methanol to get 2,3-Dichloro 1,3-Butadiene
PRODUCTION PROCESS FOR 1,2,3,4-TETRACHLOROHEXAFLUOROBUTANE AND REFINING PROCESS
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Page/Page column 4-5, (2010/06/14)
The production process for 1,2,3,4-tetrachlorohexafluorobutane of the present invention is characterized in that 1,2,3,4-tetrachlorobutane is reacted with fluorine in the presence of a solvent containing hydrogen fluoride. The 1,2,3,4-tetrachlorobutane may be obtained by chlorination of 3,4-dichlorobutene-1. Further, the present invention provides as well a process of refining 1,2,3,4-tetrachlorohexafluorobutane obtained in the manner described above. According to the present invention, 1,2,3,4-tetrachlorohexafluorobutane which is useful, for example, as a synthetic raw material for hexafluoro-1,3-butadiene used as an etching gas for semiconductors can industrially efficiently be produced by using 1,2,3,4-tetrachlorobutane which is a by-product of chloroprene and which has so far been disposed.
A novel approach to Finafloxacin hydrochloride (BAY35-3377)
Hong, Jian,Zhang, Zonghua,Lei, Huoxing,Cheng, Haiying,Hu, Yufang,Yang, Wanliang,Liang, Yinglin,Das, Debasis,Chen, Shu-Hui,Li, Ge
body text, p. 2525 - 2528 (2009/09/06)
Finafloxacin hydrochloride, an important clinical compound was synthesized by a novel synthetic approach. An active intermediate ethyl 7-chloro-8-cyano-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate 19 was prepared by a new route. The chiral (S,S′)-N-Boc 10 was derived from protected pyrrolidine and the absolute stereochemistry was established by X-ray analysis.
STEREOSELECTIVITY IN INTRAMOLECULAR DIELS-ALDER REACTION II : INFLUENCE OF ALKYL SUBSTITUENT ON CYCLIZATION OF AZATRIENES
Guy, A.,Lemaire, M.,Graillot, Y.,Negre, M.,Guette, J. P.
, p. 2969 - 2972 (2007/10/02)
Substitution of the allylic moiety of azatrienes of functionalized alkyl groups permits high chemical yields and stereoselectivity during I.M.D.A cyclization.Substituted hydroisoindoles, precursors for natural and pharmaceutical products were prepared with good yields and selectivity.
Metal-assisted Reactions. Part 17. Ring-opening and Dimerization of Cyclic Ethers by Titanium Halides
Delaney, Paul A.,Johnstone, Robert A. W.,Entwistle, Ian D.
, p. 1855 - 1860 (2007/10/02)
Reaction of TiCl4 or TiBr4 with a variety of cyclic ethers gives, predominantly, products resulting from simple ring-opening or from ring-opening with simultaneous condensation to dimeric species.The variations in yields of these two kinds of products might be correlated qualitatively with an initial formation of the complex TiX4*2E (X = Cl or Br; E = cyclic ether) in which the ethers were held in a cis or trans relationship.Although such a correlation might suggest that TiCl4 but not TiBr4 exerts a template effect on the condensation, stereochemical considerations of the reaction products indicate otherwise.TiCl3 and VCl3 do not give similar results and TiF4 gives no reaction.
