摘要:

AbstractThe uranyl chelate of ferron was investigated polarographically over thepH range 1.98–10.00 and ligand concentration 0.005–0.060.M. A reversible and diffusion controlled reduction wave was obtained, however, when ferron concentration below 0.02MandpH below 5.0, it became irreversible. The chelate species identified were UO2(HA)2atpH range 2.5–7.1 and UO2(OH) (A)2−3overpH 7.1. The electron‐transfer coefficient, rate constant, diffusion coefficient and activation energy of the reduction process were d

ISSN:0009-4536    

DOI:10.1002/jccs.198000008

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

ISSN:0009-4536    

DOI:10.1002/jccs.198000009

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractAccepting a previously proposed mechanism of ethane pyrolysis in shock tubes, experimental product distributions observed by Burcatet al. have been used, through computer simulation technique, to measure rate constants of following reactions in the temperature range 1206–1386°K.\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm CH}_{\rm 3} {\rm + C}_{\rm 2} {\rm H}_{\rm 4} \to {\rm CH}_{\rm 4} {\rm + C}_{\rm 2} {\rm H}_{\rm 3} } & {\left(2 \right)} \\\end{array} $$\end{document}\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm H + CH}_{\rm 3} \to {\rm CH}_{\rm 4} } & {\left(9 \right)} \\\end{array} $$\end{document}Obtainedk2values are substantially higher than the extrapolation from an Arrhenius equation reported for the same rate constant at low temperatures. Rate constantk2is found decreasing with the system temperature at 6.3atmof arg

ISSN:0009-4536    

DOI:10.1002/jccs.198000010

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractVarious N′,N‐bis(8‐quinolyl) trimethylenediamines3a‐3ehave been prepared from the corresponding 8‐aminoquinolines1a‐1eby directN‐alkylation with 1, 3‐dibromopropane in fair yield (25‐51%). N. N′‐bis(8‐quinolyl) ethylenediamines,3fand3g, andN,N′‐bis(8‐(6‐methoxyquinolyl) ]tetramethylenediamine.3h, may only be synthesized in poor yield via the correspon

ISSN:0009-4536    

DOI:10.1002/jccs.198000011

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractReactions of biscyclopentadienyl (and bisindenyl) titanium (IV) dichlorides with sodium salts of various thiocarboxylic acids in tetrahydrofuran medium, yield the complexes of the general formula (D)2Ti(SCOR)2where D is cyclopentadienyl or indenyl group and RH, CH3, C2H5, C4H5orp‐C4H4CH3group. The foul smelling complexes are monomeric in nature. The IR spectra, thermal stabilities and Some physical characteristics of these complexes have been stud

ISSN:0009-4536    

DOI:10.1002/jccs.198000012

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe reactions of oxybis(diacetoxyborane) with the aldimines,N‐(2‐hydroxyethyl) salicylaldimineN‐(2‐hydroxy‐1‐propyl) salicylaldimine,N‐(3‐hydroxy‐1‐propyl) salicylaldimine,N‐(o‐hydroxyphenyl) salicylaldimine.N‐(m‐hydroxyphenyl) salicylaldimine,N(2‐hydroxyethyl)‐2‐hydroxy‐1‐naphthaldimine andN(2‐hydroxy‐1‐propyl) 2‐hydroxy‐1‐naphthaldimine have been carried out in 1: 1 and 1: 2 molar ratios. All the compounds except those derived fromN‐(3‐hydroxy‐1‐propyl) salicylaldimine have been found to be sparingly soluble in benzene and nonelectrolytes in anhydrous DMF. The newly synthesized derivatives have been characterized by elemental analysis, molecular weight determinations and infrared, proton magnetic resonance, ultraviolet, v

ISSN:0009-4536    

DOI:10.1002/jccs.198000013

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY