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Mono- and bicyclic as well as spirocyclic carbonyl compounds can be prepared by intramolecular tert-alkylation of olefins such as (1) with SnCl4. An O-stannyl derivative and a carbenium ion are probably intermediates in the reaction, which should find application in terpene and steroid syntheses.
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Reetz et al. (1981) studied this question.
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