General approach to spiroacenaphthylene pentacyclic systems: Direct multicomponent assembling of acenaphthenequinone and cyclic carbonyl compounds with two molecules of malononitrile

1. Elinson, M.N.
2. Ilovaisky, A.I.
3. Merkulova, V.M.
4. Barba, F.
5. Batanero, B.