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The syntheses of enantiopure brominated and chlorinated phenolic lactaldehydes are described as well as an investigation into their cyclisation to form the corresponding 2-benzopyran-4,5-diols. It is found that the choice of halogen is important in these processes...

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Syntheses of asymmetric 2-benzopyrans. The influence of aromatic halogen substituents on the intramolecular cyclisation of enantiopure tethered phenolic lactaldehydes