When methoxy-substituted 1-(α-hydroxybenzyl)-1,2,3,4-tetrahydroisoquinolines are heated in formic acid they rearrange initially to give 5-phenyl-2,3-dihydro-1H-3-benzazepines which, on further heating in formic acid, are reduced to 1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepines.
R. M. McMahon, C. W. Thornber and S. Ruchirawat, J. Chem. Soc., Perkin Trans. 1, 1982, 2163 DOI: 10.1039/P19820002163
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