摘要:

AbstractAn empirical linear relationship between the ratio ofcisinteraction constants and the ratio of stretching force constants was derived and a method for determining the ratio ofcisinteraction constants for ligand substituted metal carbonyls was proposed. Results of the present work would enable us to assess the validity of the Cotton‐Kraihanzel approximation ofk=kcand to evaluate the correctness and the reliability of Some anomalous carbonyl force constants evaluated with other methods. The reliable correlation of the ratio of stretching force constants with the ratio of interaction constants would be helpful to clarify some ambiguous vibrational assignments made previously for the carbonyl bands of metal carbonyls, or to analyze isotope spectra of carbonyl bands for other related molecules in the same serie

ISSN:0009-4536    

DOI:10.1002/jccs.198000014

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractGraft copolymerization of methyl methacrylate onto bamboo was evidenced by means of infrared spectroscopic technique. A comparative study of chemical initiated and radiation‐induced grafting methods was made. The chemical‐initiated copolymerization treatment with water as the swelling agent can yield high grafting percentage, whereeas the radiation‐induced copolymerization treatment gives very low grafting perce

ISSN:0009-4536    

DOI:10.1002/jccs.198000015

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractDiels‐Alder reactions of sixo‐benzoquinones with dimethyl acetylenedicarboxylate has been examined. The yields of adducts vary with the natures of theo‐benzoquinones, 3,4‐Di‐n‐propyl‐(1c), 3,6‐di‐n‐propyl (1d). 3. 4‐diallyl‐(1e) and 3, 6‐diallyl‐o‐benzoquinone (1f) are found to give bicyclic a‐diketones exclusively without the formation of 1,4‐dioxine derivatives, the yields ranging from 20 to 70%. In the case of 4, 5‐dimethoxy‐o‐benzoquinone, dimethyl 4, 5‐dimethoxyphthalate is produced in 42% yield, presumably derived from the decomposition of the corresponding initially formed α‐diketone. 3, 6‐Di‐n‐propyl‐4, 5‐dimethoxy‐o‐benzoquinone deteriorates without addition to dimethyl acetylenedicarboxylate upon heating. The additions ofo‐benzoquinones1c,1dand1fto phenylacetylene are also studie

ISSN:0009-4536    

DOI:10.1002/jccs.198000016

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractWe describe the syntheses of 6, 8‐di‐tert‐butyl‐, 7, 9‐di‐tert‐butyl., 6,7‐di‐n‐propyl and 8, 9‐di‐n‐propyl‐O‐spirodienonelactone from 3, 5‐di‐tert‐butylca

ISSN:0009-4536    

DOI:10.1002/jccs.198000017

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

Abstract(Z, E)‐9, 11‐Tetradecadienyl‐l‐acetate (1), a major component of the sex pheromone ofSpodoptera litura(F.), and (Z, E}‐9, 11‐pentadecadienyl‐1‐acetate (2) were synthesized by the Wittig reaction between (E)‐2‐alkenal (3) and the ylid derived from 9‐hydroxynonyltriphenylph

ISSN:0009-4536    

DOI:10.1002/jccs.198000018

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractFern‐9(11)‐ene, diploptene, β‐sitosterol, β‐sitosteryl palmitate. β‐sitosteryl‐β‐D‐glucoside and cyclolaudenol were isolated from the rhizome of NE

ISSN:0009-4536    

DOI:10.1002/jccs.198000019

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractKinetic data of silver catalysed oxidation of dl‐atrolactic acid (A. L. A.) by peroxydisulphate ion are reported. The reaction is first order with respect to S2O52ion zero order with respect to A. L. A. The rate is linearly related with Ag+ion concentration. The oxidation products of A. L. A. were found to be CO2and acetophenone, which establish the fission of C‐C bond in the oxidation process. The mechanism of the reaction and inhibition by various substrats has been discus

ISSN:0009-4536    

DOI:10.1002/jccs.198000020

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractThe 1:1, 1:2 and 1:3 interactions of lanthanon (III) isopropoxide with monofunctional bidentate Schiff bases as salicylidene‐o‐toluidine (SOTH) and salicylidene‐p‐p‐toluidine (SPTH) have been investigated. The resulting products Ln(OPr1)2(SB), Ln(OPr1)(SB)2and Ln(SB)3(where Ln=Pr, Nd and Sm and SB1−is the anion of the corresponding Schiff base) have been isolated in almost quantitative yields. The infrared spectra of these compounds have been recorded and plausible structure

ISSN:0009-4536    

DOI:10.1002/jccs.198000021

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY

摘要:

AbstractNiobium (V) reacts with 5,7‐dinitro‐8‐hydroxyquinoline to form yellowish‐orange coloured complex having maximum absorbance at 420nmin citric acid medium. The reaction is slow at room temperate, it is complete in 15 minutes at temperate 40°. The colour is stable for at least 16 hours. Effects of heating temperate, time,pH, reagent concentration and other variables have been studied. The system confirms the Beer's law over the concentration range investigated. Optimum condition range for measurement in 10mmcell is 1–12 μg of niobium. The molar absorptivity is 5.327 × 108litre moles−1cm−1. The interference from foreign ions has been evaluated. The metal ligand ratio of 1:2 was confirmed by Job's continous variation and mo

ISSN:0009-4536    

DOI:10.1002/jccs.198000022

出版商:WILEY‐VCH Verlag    

年代:1980

数据来源: WILEY