Benzoannelated cis,cis,cis,trans- [5.5.5.6]fenestranes: Syntheses, base lability, and flattened molecular structure of strained epimers of the all-cis series

Article abstract of DOI:10.1002/1521-3765(20010803)7:15<3387::AID-CHEM3387>3.0.CO;2-6

Tribenzofenestranes possessing the strained cis,cis,cis,trans-[5.5.5.6]-fenestrane skeleton have been synthesized from cis-2,6-diphenylspiro[cyclohexane-1,2′-indane]-1′,3′-diols by two-fold cyclodehydration, in striking analogy to the strategy used previo