A Schmidt reaction with 7a-aza-B-homocholest-4-eno[7a,7-d]tetrazol-3-one (1) gave two of the eight possible products: 4,7a-diaza-AB-bishomocholest-4a-eno[7a,7-d]tetrazol-3-one (3) and either 3,7a-diaza-AB-bishomocholest-4a-eno[3,4-d][7a,7-d]bistetrazole (6) or the Δ5-isomer (8).
H. Singh and R. K. Malhotra, J. Chem. Soc., Perkin Trans. 1, 1975, 1404 DOI: 10.1039/P19750001404
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