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- W2069071771 abstract "The structures and solid-state stereochemistry of the two P-epimeric compounds (1 and 2) formed in a reaction of butyl phenylvinylphosphinite with (-)-L-menthyl bromoacetate were studied by X-ray crystallography and CP–MAS 13C NMR spectroscopy. The two compounds were also analyzed in solution by means of 2D 1H NMR, 13C NMR, IR, UV, and dipole moment measurement techniques. Compound 1, C20H29O3P, crystallized in the orthorhombic group P 212121 with Z = 4, a = 20.491(2), b = 16.719(1), and c = 5.910(1). Compound 2, C20H29O3P, crystallized in the monoclinic space group P 21 with Z = 2, a = 9.266(1), b = 9.852(1), c = 10.954(1), and β = 95.20(1)°. In the crystals both compounds possess their CCPO fragments in an s-cis array, and have their PO and CO dipoles oriented uniformly in a syn, nearly parallel, fashion. In solution, however, an anti arrangement of these two dipoles is slightly preferred." @default.
- W2069071771 created "2016-06-24" @default.
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- W2069071771 date "1991-02-01" @default.
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- W2069071771 title "Optically active phosphine oxides: 10 [1]; X-ray structure and conformation of (Sp)- and (Rp)-L-menthyl α-(phenylvinylphosphinyl)acetates" @default.
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- W2069071771 doi "https://doi.org/10.1002/hc.520020114" @default.
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