All articles of this category Treatment of trienones 1a-g with BF 3 · OEt 2 at - 78 °C followed by warming effected Nazarov electrocyclization followed by 6-endo cation-olefin cyclization. The resulting tertiary carbocations underwent elimination to give olefinic products 2 , intramolecular hydride transfer to furnish enones 3 and/or 3 + 2 ring-closure providing tricyclic products 4 . Use of TiCl 4 in place of BF 3 · OEt 2 led in most cases to a mixture of enones 3 and chloride-trapping products 7 . cyclizations - domino reactions - polycycles - ring closure - tandem reactions
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Browder et al. (1999) studied this question.