The unusual formation of methyl α-(5,6-dimethoxycarbonyl-2,3-dimethoxyazepin-7-ylidene)-α-[5- methoxycarbonyl-2,3-dimethoxypyrid-6-ylacetate during the pyrolysis of "azido-meta-hemipinate": First example of a reaction involving a concomitant ring expansio

Article abstract of DOI:10.1002/jhet.5570330454

The ortho methoxycarbonyl substituent constitutes a sole exception in the ring closure reactions of ortho substituted aryl azides, as it provides no rate acceleration to this reaction. Pyrolysis of "azido-meta-hemipinate", an aryl azide containing such a