Position-flexible elaboration of halogenated heterocycles: Metalated species as key intermediates for synthesis
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Azomethines (Schiff's bases) derived from a,b-unsatd. a-fluoroaldehydes can be deprotonated with lithium diisopropylamide. The resulting "anions" or, correctly, 3-fluoro-1-azapentadienyl lithium compds. are conformationally mobile. While eight different ...
An expedient method for the prepn. of diastereomerically and, by extension, even enantiomerically pure vicinal difluoroalkanes is described. The two fluorine atoms are introduced in two consecutive steps: ring opening of an oxirane by addn. of hydrogen flu ...
