Free-radical substitution in aliphatic compounds. Part XVIII. The gas-phase chlorination of 1-phenylpropane
作者:V. R. Desai、A. Nechvatal、J. M. Tedder
DOI:10.1039/j29690000030
日期:——
The chlorination of 1-phenylpropane has been studied in the gas phase from 90–200°. Attack is favoured at the 1-position, while the 2-position is deactivated in comparison to the secondary positions in butane. Appreciable yields of 1-phenylprop-1-ene are formed. The amount of olefinic product was reduced by the addition of an inert gas (SF6). It is suggested that when an alkyl radical reacts with molecular
Compounds are provided which have the structure
Wherein A, B, C, D, m, Y, Ra, Rc, Rd, and Rd′ are as described herein, and which are useful as inhibitors of tryptase, thrombin, trypsin, Factor Xa, Factor VIIa, Factor XIa, and urokinase-type plasminogen activator and may be employed in preventing and/or treating asthma, chronic asthma, allergic rhinitis, and thrombotic disorders.
Method for producing an aromatic compound having an alkyl group with at least three carbon atoms
申请人:TORAY INDUSTRIES, INC.
公开号:EP0985649A2
公开(公告)日:2000-03-15
Aromatic compounds having an alkyl group with at least 3 carbon atoms are produced in a process comprising at least one of the following steps:
(1) a step of contacting a starting material that contains an aromatic compound having a branched alkyl group with at least 3 carbon atoms, with a zeolite-containing catalyst in a liquid phase in the presence of hydrogen therein, thereby changing the position of the carbon atoms of the alkyl group bonding to the aromatic ring of the compound;
(2) a step of contacting a starting material that contains an aromatic compound having a branched alkyl group with at least 3 carbon atoms, with a catalyst containing zeolite and containing rhenium and/or silver, in a liquid phase, thereby changing the position of the carbon atoms of the alkyl group bonding to the aromatic ring of the compound;
(3) a step of contacting a halogenated aromatic compound having an alkyl group with at least 3 carbon atoms, with an acid-type catalyst, thereby isomerizing the compound; and
(4) a step of treating a mixture of isomers of an aromatic compound having an alkyl group with at least 3 carbon atoms, with a zeolite adsorbent that contains at least one exchangable cation selected from alkali metals, alkaline earth metals, lead, thallium and silver, thereby separating a specific isomer from the isomer mixture through adsorption.
Preparation of isobutene homo- or copolymer derivatives
申请人:BASF SE
公开号:US10745496B2
公开(公告)日:2020-08-18
A process for preparing isobutene homo- or copolymer derivatives by (i) polymerizing isobutene or an isobutene-comprising monomer mixture in the presence of an iron halide-donor complex, an aluminum trihalide-donor complex, or an alkylaluminum halide-donor complex, (ii) reacting a resulting high-reactivity isobutene polymer with a compound which introduces a low molecular weight polar group or a substructure thereof, and (iii) in the case of reaction with a substructure, further reacting to complete the formation of the low molecular weight polar group. The homo- or copolymer derivatives include a radical of a hydrophobic polyisobutene polymer having a number-average molecular weight of 110 to 250 000 and low molecular weight polar groups including amino functions, nitro groups, hydroxyl groups, mercaptan groups, carboxylic acid or carboxylic acid derivative functions, sulfonic acid or sulfonic acid derivative functions, aldehyde functions and/or silyl groups.