Acyclic sulfones 4a− f and alicyclic sulfone 7 react with readily available N-
acylbenzotriazoles 3a− g (derived from aliphatic, aromatic, and heteroaromatic carboxylic …

The thermal 4: 1 equilibrium mixture of 1, 3, 5, 6‐and 1, 3, 5, 10‐tetramethylheptalene (13a
and 13b, resp.) has been prepared, starting from the thermal equilibrium mixture of dimethyl …

Methyl heptalenecarboxylates of type A and B with π (1) and π (2) substituents in 1, 4‐
relation (Scheme 1) were synthetized starting with dimethyl 1‐methylheptalene‐4, 5 …

(Phenylsulfonyl) benzo [a] heptalene‐2, 4‐diols 1 can be desulfonylated with an excess of
LiAlH4/MeLi⋅ LiBr in boiling THF in good yields (Scheme 6). When the reaction is run with …

It is shown that heptalene‐4, 5‐dicarboxylates 2, which react with lithiated methyl sulfones
mainly in a Michael fashion at C (3)(cf. Scheme 2), so that the formation of 3‐sulfonylbenzo …

A number of azulenes 1, in particular those with π‐substituents at C (6) such as phenyl, 3, 5‐
dimethylphenyl, and 4‐biphenyl, have been reacted with 3 mol‐equiv. of dimethyl …

The benzo [a] heptalene formation from 4‐[(R‐sulfonyl) acetyl] heptalene‐5‐carboxylates 15
and 5‐[(R‐sulfonyl) acetyl] heptalene‐4‐carboxylates 16 (R= Ph or morpholino) in the …

Abstract Alkylation reactions of 3‐(X‐sulfonyl) benzo [a] heptalene‐2, 4‐diols (X= Ph,
morpholin‐4‐yl) and their dimethyl ethers were studied. The diols form with K2CO3/MeI in …

By Hafner's synthesis, dimethyl heptalene-4, 5-dicarboxylates are easily available from
azulenes and dimethyl acetylene-dicarboxylate. Treatment with Takai reagent leads to 4 …

A novel approach towards the synthesis of functionalized benzo [a] heptalenes 9 and 10 via
a 6π‐electrocyclic ring closure–aromatization sequence of corresponding bis [prop‐2 …