Picosecond radical kinetics. Rate constants for ring openings of 2-aryl-substituted cyclopropylcarbinyl radicals
摘要:
The kinetics of ring openings of a series of eight (trans-2-arylcyclopropyl)methyl radicals (1) were studied by indirect kinetic methods using Barton's PTOC esters as radical precursors and reaction with PhSeH as the competition reaction. The substituents were CF3, F, Me, and OMe located on both the para and meta positions of the aromatic ring. Syntheses of the radical precursors and the products of the radical reactions are described. Kinetics were determined between -43 and 25 degrees C in four cases (CF, and OMe substituents) and at 0 and 25 degrees C in the other four cases. The rate constants at 25 degrees C ranged from 1.0 x 10(11) s(-1) (p-CH3) to 4.1 x 10(11) s(-1) (p-CF,). The relatively large acceleration of the p-CF3 group, ca. 2.5 times as fast as the parent system with Ar = Ph, correlates well with Adam's Delta D substituent parameters but not with other radical substituent parameters. These calibrated radical rearrangements provide a new set of ultrafast reactions that can be applied in mechanistic probe studies.
[EN] PREPARATION OF SURFACTANTS VIA CROSS-METATHESIS<br/>[FR] PRÉPARATION DE TENSIOACTIFS PAR MÉTATHÈSE CROISÉE
申请人:MATERIA INC
公开号:WO2015126462A1
公开(公告)日:2015-08-27
The present invention relates to compositions comprising 2-phenyl linear alkene benzenes or 2-phenyl linear alkene benzene sulfonates or 2-phenyl linear alkylbenzenes or 2-phenyl linear alkylbenzene sulfonates; where the benzene ring is optionally substituted with one or more groups designated R *, where R * is defined herein and to methods for making the same. This invention also relates to compositions, methods of making, use of, and articles of manufacuture comprising 2-ethoxylated hydroxymethylphenyl linear alkyl benzenes or 2-propoxylated hydroxymethylphenyl linear alkyl benzenes.
The present invention relates to compositions comprising alkene benzenes or alkene benzene sulfonates or alkylbenzenes or alkylbenzene sulfonates; methods for making alkene benzenes or alkene benzene sulfonates or alkylbenzenes or alkylbenzene sulfonates; where the benzene ring is optionally substituted with one or more groups designated R*, where R* is defined herein. More particularly, the present invention relates to compositions comprising 2-phenyl linear alkene benzenes or 2-phenyl linear alkene benzene sulfonates or 2-phenyl linear alkylbenzenes or 2-phenyl linear alkylbenzene sulfonates; methods for making 2-phenyl alkene benzenes or 2-phenyl alkene benzene sulfonates or 2-phenyl alkylbenzenes or 2-phenyl alkylbenzene sulfonates; where the benzene ring is optionally substituted with one or more groups designated R*, where R* is defined herein. This invention also relates to compositions, methods of making, use of, and articles of manufacture comprising 2-ethoxylated hydroxymethylphenyl linear alkyl benzenes. This invention also relates to compositions, methods of making, use of, and articles of manufacture comprising 2-propoxylated hydroxymethylphenyl linear alkyl benzenes.
PYRIDONE COMPOUND, AND AGRICULTURAL AND HORTICULTURAL FUNGICIDE HAVING THIS AS ACTIVE COMPONENT
申请人:Mitsui Chemicals Agro, Inc.
公开号:EP3611164A1
公开(公告)日:2020-02-19
Novel compounds controlling plant diseases are provided. Pyridone compounds of the invention are novel and can control plant diseases. The pyridone compounds of the invention encompass compounds of formula (1) and salts thereof.