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Phenyliodonium ylide of lawsone, activated by BF 3 ·Et 2 O, reacts with electron-rich arenes to afford the corresponding 2-aryl-3-hydroxy-1,4-naphthoquinones, in a coupling reaction without metal catalysts. The same type of products, in greater variety and higher yields, are obtained from the reaction of the BF 3 ·Et 2 O-activated ylide with aromatic aldehydes in a synthetically and mechanistically interesting deformylation reaction.