2-Alkenyl-5-phenyltetrazoles 7a–e are readily converted by thermolysis or photolysis into 3-phenylpyrazoles 11a–e in good to excellent yield (Table 2). The alkenyltetrazoles 7 are prepared by direct or indirect dehydration of the alcohols 5 formed by quenching α-lithioalkyltetrazoles with aldehydes.
C. J. Moody, C. W. Rees and R. G. Young, J. Chem. Soc., Perkin Trans. 1, 1991, 329 DOI: 10.1039/P19910000329
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