title: A new regiospecific preparation of xanthones.
abstract: [reaction: see text] Condensation of a benzopyranonphthalide with Michael acceptors provides an efficient, general method for regiospecific preparation of xanthones as well as linear and angular polycyclic aromatic systems containing a xanthone fragment.
mesh_terms: D001572:Benzofurans / Q000737:chemistry; D001578:Benzopyrans / Q000737:chemistry; D013237:Stereoisomerism; D044004:Xanthones / Q000138:chemical synthesis*
chemical_list: D001572:Benzofurans; D001578:Benzopyrans; D044004:Xanthones; C082022:phthalide