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Le spectrogramme Raman et la structure des acidee ol6ique et m i d i q u e par A. VAN DEN HENDE (Gad) SCYYAIIY.-The author has succeeded ~J I taking irl;t*fd 1titJIiiiIIapcslra of olsic iicitl, c*lhyl-cdcatc! atid their et hyleuc stc*rwisorriers i4aidic acid and ethylelaidate. 'rhc spectra show t.ha1 the Erequewic.r, clue to the double union betwcwi the two double bound C atoms. hiis it lower value for the oleic acid arid Ihe oleafe than for the elaidb acid and the elaidate.Different other research-workers had alreaay obsc*n-ed lhiit. iri many groups of unsaturated compounds, the mentioned frequenciw are smaller for the cis-than for the trans-isomers. Dipolar nwasurements wherefrom the st.ructure of the p-chloro-crotonic acid c*sl.crs could bc clcduced, together with the R-spectra of these $-chlorocroloiiic acid esters, permit to concliicle that. in the group of the unsaturated kttg ticids and their csters, Ihc lowest freqiicncies are also due to 1111: cis isomers.About the very discussed problem of thc cis-or trans-structure of oleic acid, the R-spcctrogmplq offws t hereforct , serious iirgumenl to accept the cis structure for thc nlcic acid and the trans striicliirv for the clddic acid.Nous iivons exnmiiiC tliiils une comniuniciilion iinifiricwre les possibililCs de la spevl.ropr:iphie Ranian dans le domiline de ! 'a1idyse des griiisses (':I . Ces possibilit6s nous pnraissaienl yrovisoireinent reslrcinles, Ctanl d o i d les difficult6s inhCrent.es B In piirificiitioa requise des acides grits et des triglyc*i\rides. En plus lea speolrogrammes des ;toides grits snlrirfis siq)i.rieurs ct. de leurs esters sont si seniblables ent.re eux qu'ils iitf peiiv(wI servir B les identifier, surtout dans un m8lange. Par centre, ICR npectrogritmnws des acitles olCique et Blaidiqrie, ainsi yuc CPIIX de leiirs eslers 6thyliques, fournissenl des reiiseignemc!nIs intbrcssnnts ( p n t 3 In slriiclure de ces combinnit sons (a). Sl'i<(:'~l+V R.\M \ N URI .\C:ll)lSS OJ.fiJQl~# ET RJAinIQTW :j2!)
Le spectrogramme Raman et la structure des acidee ol6ique et m i d i q u e par A. VAN DEN HENDE (Gad) SCYYAIIY.-The author has succeeded ~J I taking irl;t*fd 1titJIiiiIIapcslra of olsic iicitl, c*lhyl-cdcatc! atid their et hyleuc stc*rwisorriers i4aidic acid and ethylelaidate. 'rhc spectra show t.ha1 the Erequewic.r, clue to the double union betwcwi the two double bound C atoms. hiis it lower value for the oleic acid arid Ihe oleafe than for the elaidb acid and the elaidate.Different other research-workers had alreaay obsc*n-ed lhiit. iri many groups of unsaturated compounds, the mentioned frequenciw are smaller for the cis-than for the trans-isomers. Dipolar nwasurements wherefrom the st.ructure of the p-chloro-crotonic acid c*sl.crs could bc clcduced, together with the R-spectra of these $-chlorocroloiiic acid esters, permit to concliicle that. in the group of the unsaturated kttg ticids and their csters, Ihc lowest freqiicncies are also due to 1111: cis isomers.About the very discussed problem of thc cis-or trans-structure of oleic acid, the R-spcctrogmplq offws t hereforct , serious iirgumenl to accept the cis structure for thc nlcic acid and the trans striicliirv for the clddic acid.Nous iivons exnmiiiC tliiils une comniuniciilion iinifiricwre les possibililCs de la spevl.ropr:iphie Ranian dans le domiline de ! 'a1idyse des griiisses (':I . Ces possibilit6s nous pnraissaienl yrovisoireinent reslrcinles, Ctanl d o i d les difficult6s inhCrent.es B In piirificiitioa requise des acides grits et des triglyc*i\rides. En plus lea speolrogrammes des ;toides grits snlrirfis siq)i.rieurs ct. de leurs esters sont si seniblables ent.re eux qu'ils iitf peiiv(wI servir B les identifier, surtout dans un m8lange. Par centre, ICR npectrogritmnws des acitles olCique et Blaidiqrie, ainsi yuc CPIIX de leiirs eslers 6thyliques, fournissenl des reiiseignemc!nIs intbrcssnnts ( p n t 3 In slriiclure de ces combinnit sons (a). Sl'i<(:'~l+V R.\M \ N URI .\C:ll)lSS OJ.fiJQl~# ET RJAinIQTW :j2!)
A study of the vibrational spectrum of 3-methyl-2-butenenitrile has been carried out. The infrared spectra above 625 cm-' of the gaseous, liquid and solid states, and the Raman spectra of the liquid and solid states are reported. An assignment has been made for the observed vibrational frequencies with the aid of a normal coordinate treatment. Estimates were made for the torsional barrier heights and frequencies of the two methyl groups, but only one of the torsional frequencies could be located. Values for the thermodynamic functions of the ideal gas were calculated using the observed spectroscopic data; contributions due to the torsional motions were calculated from the estimated barrier heights.
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