Conclusions
It was shown that fluorosulfonic acid can be used as a cyclization agent in the cyclization reactions of isoprenoids, and it has a number of important advantages, and, in particular, it can be used in small amounts (clear down to catalytic amounts), which makes the cyclization structurally more selective and applicable to objects that previously were not amenable to this reaction.
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See [1] for Communication 25.
Translated from Izvestiya Akademii NaukSSSR, Seriya Khimicheskaya, No. 2, pp. 390–394, February, 1973.
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Kurbanov, M., Semenovskii, A.V. & Smit, V.A. Cyclization of isoprenoid compounds. Russ Chem Bull 22, 370–373 (1973). https://doi.org/10.1007/BF00850993
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DOI: https://doi.org/10.1007/BF00850993