Formation of a reasonably stabilized trichloromethyl anion by the reaction of chloroform with electrogenerated base, and its 1,4-addition to α,β-unsaturated carbonyl compounds
A reasonably stabilized trichloromethylanion (TCMA) was formed by the reaction of chloroform with an electrogenerated base prepared by the electroreduction of 2-pyrrolidone, and the addition of this TCMA to α,β-unsaturated esters gave the corresponding β-trichloromethyl esters in good yields.
Recoverable Phase-Transfer Catalysts with Fluorinated Anions: Generation and Reactions of Dichlorocarbene and CCl3 Anion in the Heterogeneous System KOH(s)/CHCl3/nBu4NPF6
作者:Galina V. Kryshtal、Galina M. Zhdankina、Sergei G. Zlotin
The inhibition effect of inorganic compounds on the corrosion of the 3003 aluminium alloy in the presence of sodium chloride
作者:L. Bazzi、R. Salghi、A. Bouchtart、Z. El Alami、S. Kertit
DOI:10.1051/metal:2002192
日期:2002.2
This study concerns the inhibition of the corrosion of the aluminium alloy 3003 in a solution of 3% NaCl by Li+, Mg2+, MoO42-, NO2- and CrO42- ions. The methods used are the determination of the polarization curves and the metallographic examination of the surface condition. The results obtained show that the tested ions inhibit the corrosion process.The comparative study of the effect of these ions shows that the Mg2+ ions are the most efficient ones in the temperature range from 25 to 65°C. The inhibition efficiency increases with the concentration of these ions and reaches a maximum value of 86% for 5 × 10-2 alloy. As a consequence, the gap between pitting and corrosion potentials becomes larger. At 75°C, Mg2+ ions tend to stimulate corrosion of alloy 3003 in the chloride solution considered.
Titanium catalysts, preparation and use in co- and ter-polymerization of alpha-olefins
申请人:——
公开号:US20040143127A1
公开(公告)日:2004-07-22
Titanium complex having general formula (1) (RCOO)
n
TiX
p
wherein R is a monofunctional hydrocarbyl radical having from 1 to 20 carbon atoms and a number of halogen atoms, selected from fluorine, chlorine and bromine, preferably chlorine, ranging from 1 to 6; X is chlorine, bromine or a beta-dicarbonyl group such as acetylacetone (AcAc), formylacetone, benzoylacetone, dibenzoylmethane; p+n=2, 3, 4, preferably p+n=3; n is greater than or equal to 1. The preparation of the above complex and its use in the co- and ter-polymerization of &agr;-olefins, are also described.
Process for Preparing 1-Alkyl-3-difluoromethyl-5-hydroxypyrazoles
申请人:PAZENOK Sergii
公开号:US20110288304A1
公开(公告)日:2011-11-24
The present invention relates to a process for preparing 1-alkyl-3-difluoromethyl-5-hydroxypyrazoles, which are valuable intermediates for the production of fungicides.