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- W2042804974 abstract "Abstract Triphenylphosphonium ylidic keto diesters with a nonylidic ester group, Ph 3 P C(CO 2 CH 2 CH 3 )CO CO 2 CH 2 CH 3 , 1 , and Ph 3 P C(CO 2 CH 2 CH 3 )CO CH 2 CO 2 CH 2 CH 3 , 2 , have the keto group syn and the ylidic ester acyl group anti to phosphorus. Conformation of 2 is assigned by X-ray crystallography, while conformations of 1 and 2 are based on 1 H and 13 C NMR spectroscopy, and comparisons of acyl stretching frequencies with predicted values from HF and DFT methods. Thermolyses of 1 and 2 gave the expected acetylene derivatives in high yield, consistent with the syn keto conformation and in agreement with earlier observations of thermolyses of stabilized phosphonium ylides. Results from the X-ray spectrum of 2 confirm the proposed structure." @default.
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- W2042804974 date "2011-10-01" @default.
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- W2042804974 title "Molecular structures and preferred conformations of stabilized keto diester phosphonium ylides" @default.
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- W2042804974 doi "https://doi.org/10.1016/j.molstruc.2011.08.022" @default.
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