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- W2010770423 abstract "Abstract The reactions of 2,3-dimethyl-1,3-butadiene with (E)-2-cyanocinnamates of (S)-ethyl lactate ( 1a ) and (R)-pantolactone ( 1b ), catalysed by TiCl 4 , afford enantiomerically pure cycloadducts which are easily converted into the enantiomers (1R, 6S) and (1S, 6R) of the methyl 1-cyano-3,4-dimethyl-6-phenyl-3-cyclohexen-1-carboxylate. The reactions with TiCl 4 can be explained by the dienophile-TiCl 4 chelate model proposed by Helmchen. The non-catalysed reaction of ( 1b ) with the same diene takes place at 100 °C, with a moderately high d.e. and reversal of selectivity." @default.
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- W2010770423 date "1992-07-01" @default.
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- W2010770423 title "Reaction of 2,3-dimethyl-1,3-butadiene with chiral (E)-2-cyanocinnamates." @default.
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