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- W2313960042 abstract "Abstract Interpretation of the IR spectra of R2P[dbnd]PR2 diphosphanes indicates a trans conformation for solid (C6H5)2P[dbnd]P(C6H5)2 and a gauche conformation for liquid [(C2H5)2N]2P[dbnd]P[N(C2H5)2]2, while the coexistence of a trans conformer in the later case is not ruled out. The RR′P[dbnd]PR′R diphosphanes exist as meso and di isomers. Conformational analysis of [(CH3)2N](C2H5)P[dbnd]P(C2H5)[N(CH3)2] by CNDO/2 calculations shows the total energy to be minimum for the meso-trans and the dl-trans isomers. The IR spectra of the RR′P[dbnd]PR′R diphosphanes (R [dbnd] N(C2H5)2; R′ [dbnd] C2H5, C6H11), C6H5) are thus interpreted on the basis of a mixture of meso-trans and dl-trans isomers whose proportions are substituent dependent. L'interprétation des spectres IR de diphosphanes R2P[dbnd]PR2 met en évidence une conformation trans pour (C6H5)2P[dbnd]P(C6H5)2 solide et une conformation gauche pour [(C2H5)2N]2P[dbnd]P[N(C2H5)2]2 liquide, mais la coexistence du conformère trans ne peut ětre exclue pour ce dernier composé. Les diphosphanes RR′P[dbnd]PR′R présentent une stéréoisomérié optique. Une analyse conformationnelle de [(CH3)2N](C2H5)P[dbnd]P(C2H5)[N(CH3)2] par un calcul CNDO/2 conduit à envisager un mélange d'isomères meso-trans et dl-trans. Les spectres IR des diphosphanes RR′P[dbnd]PR′R (R [dbnd] N(C2H5)2; R′ [dbnd] C2H5, C6H11, C6H5) peuvent alors s'interpréter sur la base d'un mélange d'isomères méso-trans et dl-trans dans des proportions variables en fonction de la nature des substituants." @default.
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- W2313960042 date "1983-06-01" @default.
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- W2313960042 title "APPROCHE DES CONFORMATIONS DE DIPHOSPHANES DIALCOYLAMINES ET PHENYLES" @default.
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- W2313960042 doi "https://doi.org/10.1080/03086648308073306" @default.
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