This unexpected result evidently occurs by an ipso-type electrophilic attack of the benzylic cation produced from 4 on the carbon bearing the 1-methoxy group of the naphthalene ring to form 5. The cation, 5, then stabilizes itself by loss of methanol from adjacent carbons and a proton to produce 6. To our knowledge this reaction represents the first example of an ipso- type displacement of a methoxy groups on carbons5 It is noteworthy that an ipso attack ...