Polycyclic compounds beyond the propellanes and fenestranes: [m.n.o.p.q]centropenta- and [m.n.o.p.q.r]centrohexacyclanes

摘要: Abstract Several new homo- and heterocyclic topologically nonplanar organic compounds ( 11, 14, 17–20 ) with centrohexacyclic K 5 type) molecular frameworks are described. Besides some centrohexaquinanes comprising five-membered rings exclusively (‘[5.5.5.5.5.5]centrohexacyclanes’), a number of congeners containing two six or seven-membered have been synthesized for the first time (‘[6.5.6.5.5.5]- [7.5.7.5.5.5]centrohexacyclanes’). Based on [m.n.o.p]fenestranes, notation is proposed to define unequivocally mutual orientation various rings.