Triethylamine in chloroform triggers the rearrangement of methoxymethyl 6β-p-nitrobenzylideniminopenicillanate to methoxymethyl 2,3,4,7-tetrahydro-2,2-dimethyl-6-p-nitrobenzylidenimino-7-oxo-1,4-thiazepine 3(S)-carboxylate, which rearranges further to the triethylamine salt of 3-(1-carboxy-2-methylprop-1-enyl)-2,3-dihydro-5-p-nitrobenzylidenimino-6-oxo-1,3-thiazine.
J. R. Jackson and R. J. Stoodley, J. Chem. Soc. D, 1970, 14 DOI: 10.1039/C29700000014
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