SYNTHESIS OF 2- OR 4,6-DINITRO-<i>sec</i>-PENTYL PHENOLS
作者:G. G. S. Dutton、M. E. D. Hillman、J. G. Moffatt
DOI:10.1139/v64-067
日期:1964.2.1
not available
不可用
Chiral diamine compounds for the preparation of chiral alcohols and chiral amines
申请人:University College Dublin
公开号:US10196338B2
公开(公告)日:2019-02-05
Processes for stereoselective preparation of a chiral alcohol or a chiral amine are described. The processes include reacting a first prochiral reactant selected from the group consisting of a ketone, an aldehyde, and an imine, with a second reactant that includes a Grignard reagent, in the presence of a chiral trans-diamine of formula (1) as defined herein:
Provided herein are tripeptide epoxy ketone protease inhibitors, methods of their preparation, related pharmaceutical compositions, and methods of using the same. For example, provided herein are compounds of Formula (X):
and pharmaceutically acceptable salts and compositions including the same. The compounds and compositions provided herein may be used, for example, in the treatment of diseases including inflammation and neurodegenerative disease.
Reaktivit�t und Selektivit�t bei der Oxidation von Styrolderivaten. IV. Untersuchungen zur Oxidation von substituierten ?,?-Dimethylstyrolen
作者:W. Y. Suprun
DOI:10.1002/prac.19983400308
日期:——
The liquid phase oxidation of substituted (p-MeO-, p-Cl-, m-CF3-) 2-aryl-3-methyl-but-2-enes, of 1,1-diphenyl-2-methyl-propene, of 1-ethoxy-2-methyl-1-phenyl-propene and of 9-isopropylidene-fluorene with pure oxygen was investigated in chlorobenzene solution and in presence of cumene and of cumene hydroperoxide in the temperature range 65-125 degrees C. The product yields were determined gaschromatographically. The differences of the activation energies of epoxide formation and the parallel reactions were calculated. They amount to 19-48 kJ/mol. The epoxide selectivity increases with increasing temperature and increasing concentration of olefin. The relative chain propagation constants (k(pC=C)) were determined by competitive oxidation with cumene. The k(pC=C) values of substituted beta,beta-dimethylstyrenes can be correlated by a LFE-relationship with the ionisation energies of the olefins.
Synthese und Reaktivität vontert-Butyl-(2-aryl-3-methyl-but-2-yl)-peroxiden
作者:W. Ya. Suprun、D. Schulze
DOI:10.1002/prac.19973390111
日期:——
tert-Butyl-(2-aryl-3-methyl-but-2-yl) peroxides (2a-d) were prepared from t-BuOOH and corresponding 2-aryl-methyl-butan-2-ols (1a-d) (Ar:p-MeO-C6H4 (a); Ph (b); p-Cl-C6H4 (C); m-CF3-C6H4 (d)) and characterized by NMR, MS and elemental analysis.Kinetic data for the thermolysis of 2a-d in cumene as the solvent were determined at 110-140 degrees C and the products analyzed. The rate constants satisfy the Hammett equation with sigma giving a rho-value of -0.73. Oxidation of 2a-d at 80 degrees C gives the corresponding acetophenones 4, epoxides 6 and hydroperoxides 8. The products of the oxidation of 2a-2d were analysed after reduction of the reaction mixtures with LiAlH4. Relative reactivities of the tertiary C-H bonds of peroxides 2 were determined by competitive oxidations. They amount to 0.115-0.275 (with respect to the tertiary C-H bond of cumene)