The preparation of (–)-6,7-dihydro-1,11-dimethoxy-5H-dibenz[c,e]azepine-6-spiro-1′-piperidinium iodide starting from (+)-6,6′-dimethoxydiphenic acid is described. Its optical stability has been determined approximately. Methyl 6-methoxydiphenate has been prepared and used for the synthesis of monomethoxydibenzazepinium salts.
D. M. Hall and J. M. Insole, J. Chem. Soc., Perkin Trans. 2, 1972, 1164 DOI: 10.1039/P29720001164
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