Ring formation with p-toluenesulfonylmethyl isocyanide (TosMIC), and successive CO loss, leads preparatively to hitherto unobtainable or not easily obtained polycyclic hydrocarbons. From the triketone 1, the ketone intermediates 2 and 3 and the hydrocarbon 4 can be isolated.
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Breitenbach et al. (1992) studied this question.
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