Alumina-mediated dealkylative dimerization of 4-aminobenzyl esters
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Add time:08/30/2019 Source:sciencedirect.com
Treatment of 4-aminobenzyl esters with Al2O3 in DCM at rt afforded the dealkylative dimerized 4,4′-diamino-diphenylmethanes in satisfactory yield. The reaction may proceed via a quinone methide iminium ion intermediate, which may then undergo Michael type addition followed by retro-aldol extrusion of a formaldehyde species.
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