pseudoazulenes containing two fused five
โ
G.V. Boyd
๐
Article
๐
1965
๐
Elsevier Science
๐
French
โ 196 KB
REPLACEMENT of a C=C unit in the seven-membered ring of azulene by an atom X, which can supply two n-electrons to the aromatic decet, gives rise to the pseudoasulenes(1) I and II. Representatives of all these heterocyclic systems, in which X = 0, N, or S, are now known (2 -7) and