Syntheses of asymmetric 2-benzopyrans. The influence of aromatic halogen substituents on the intramolecular cyclisation of enantiopure tethered phenolic lactaldehydes - Giles, Robin G. F.; Green, Ivan R.; Oosthuizen, Francois J.; Taylor, C. Peter (ARKIVOC, 2003)
doi: 10.3998/ark.5550190.0003.911