摘要:

AbstractThe tritium fractionation between water and radicals formed in the radiolysis of dilute solutions of monomerous methyl methacrylate in H2O‐HTO and D2O‐DTO mixutres was studied. A parallel determination of the tritium content in molecular hydrogen was performed. Also, the isotopic composition of the initial molecular hydrogen was measured in the concentration range 10 to 90 Mol% D2O of H2O‐HDO‐D2O mixtures.Hydrogen atoms, hydroxyl radicals and molecular hydrogen produced in the radiolysis of these solvents were found to be depleted in heavier hydrogen isotopes. The isotope effects on the composition of hydrogen atoms are discussed in terms of the rate isotope effects in proton transfer. The isotope effects on the composition of hydroxyl radicals are close to those on molecular hydrogen and their extent suggests ionic dissociation of water as a rate‐determining step in the process of formation of both

ISSN:0021-2148    

DOI:10.1002/ijch.196700016

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe various compounds obtained by the reaction P4O10+ 4ROH (where R represents hydrocarbon radicals of various length and structure) were identified by infrared spectrophotometry of the fractions separated by column chromatography. The identification was made possible by a comparison between the relative values of the integrated absorption for the P = O, P‐O‐P, P‐O‐C and O‐H bands with those of known standards. For the reaction of phosphorus pentoxide with ethanol, the compounds formed were found to be: mono‐, di‐ and triethyl phosphate, mono‐, (1, 2) di‐ and triethyl‐pyrophosphate; (1, 3) di‐ and (1, 2, 3) triethyl triphosphate; mono‐ and diethyl trimetaphosphate. With other alcohols, only homologs of these compounds were found, but always fewer compounds. Uncertainty between possible isomers was resolved by identification of their a

ISSN:0021-2148    

DOI:10.1002/ijch.196700017

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractA series of 6‐trifluoromethyltryptamines has been prepared from 6‐trifluoromethylindole as the starting material. Conversion of the CF3group to CH3was observed during the reduction of some of these compounds with lithium aluminum hydr

ISSN:0021-2148    

DOI:10.1002/ijch.196700018

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

摘要:

AbstractThe activity of ATP‐ase activity in bean roots homogenate was tested by following the release of32Pi from γ‐labelled ATP. It was found that most of the enzymatic activity resides in the soluble fraction. The soluble enzyme requires Mg or Ca for activity and is further highly stimulated by some monovalent cations. The enzyme is compared with the “transport” ATP‐ase located in membranes of various animal tissues and with other enzymatic systems which

ISSN:0021-2148    

DOI:10.1002/ijch.196700019

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0021-2148    

DOI:10.1002/ijch.196700020

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0021-2148    

DOI:10.1002/ijch.196700021

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0021-2148    

DOI:10.1002/ijch.196700022

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY

ISSN:0021-2148    

DOI:10.1002/ijch.196700023

出版商:WILEY‐VCH Verlag    

年代:1967

数据来源: WILEY