Double diene synthesis from α-pyrone and azodicarboxylic esters gives monocyclic hydrazine di-esters and bicyclic bishydrazine tetra-ester; the latter, a new class of heterocycle, show two pairs of non-equivalent ester groups in the room temperature n.m.r. spectrum.
P. C. Arora and D. Mackay, J. Chem. Soc. D, 1969, 677 DOI: 10.1039/C29690000677
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