Cycloadditions of nonbenzenoid carbo- and heterocyclic conjugated π-electron systems with suitable reactants provide a facile entry to ring systems that were hitherto difficult to prepare, if at all[¹]. For instance, cyclopent[cd]azulene (1)I²] which is now readily accessible reacts with dimethyl acetylenedicarboxylate even at room temperature to give 75 % of the 1:1 adduct (2)
A completely planar, delocalized 14π-electron system which does not contain cyclically conjugated su...
Cycloadditions to the azulene system have not hitherto been observed. Instead, azulene reacts, e.g.,...
Reaction of dimethyl acetylenedicarboxylate 2a with azulene 1 (boiling tetralin, 207.6 °C) leads to ...
Cycloadditions of nonbenzenoid carbo- and heterocyclic conjugated π-electron systems with suitable ...
Similarly to pentalene, azulene[¹], and cyclopent[cd]azulene[²], the readily accessible aceheptylen...
Like acenaphthylene (1), the isomeric compound cyclopent- [cd]azulene (2) can also undergo 1,2-cyclo...
The cyclopentacyclononene derivative (3). the first compound to contain this ring system and also th...
Alkyl and aryl derivatives [¹] of cyclopent[cd]azulene (1) exhibit a notable reactivity in cycloadd...
The two lowest homologs of the annulene series, i. e. cyclobutadiene and benzene, are known to under...
Cycloaddition reactions of the azulene system 1 with electron-poor and electron-rich alkynes provide...
In connection with studies of 2H-benz[cd]azulene (1) [¹] and the strongly acidic fluoradene (2) [²]...
Methyl derivatives of the still unknown hydrocarbon (1a) azuleno[8,8a,1,2-def]heptalene (dicyclohept...
The cyclopentacyclononene derivative (3). the first compound to contain this ring system and also th...
A completely planar, delocalized 14π-electron system which does not contain cyclically conjugated su...
Cycloadditions to the azulene system have not hitherto been observed. Instead, azulene reacts, e.g.,...
Reaction of dimethyl acetylenedicarboxylate 2a with azulene 1 (boiling tetralin, 207.6 °C) leads to ...
Cycloadditions of nonbenzenoid carbo- and heterocyclic conjugated π-electron systems with suitable ...
Similarly to pentalene, azulene[¹], and cyclopent[cd]azulene[²], the readily accessible aceheptylen...
Like acenaphthylene (1), the isomeric compound cyclopent- [cd]azulene (2) can also undergo 1,2-cyclo...
The cyclopentacyclononene derivative (3). the first compound to contain this ring system and also th...
Alkyl and aryl derivatives [¹] of cyclopent[cd]azulene (1) exhibit a notable reactivity in cycloadd...
The two lowest homologs of the annulene series, i. e. cyclobutadiene and benzene, are known to under...
Cycloaddition reactions of the azulene system 1 with electron-poor and electron-rich alkynes provide...
In connection with studies of 2H-benz[cd]azulene (1) [¹] and the strongly acidic fluoradene (2) [²]...
Methyl derivatives of the still unknown hydrocarbon (1a) azuleno[8,8a,1,2-def]heptalene (dicyclohept...
The cyclopentacyclononene derivative (3). the first compound to contain this ring system and also th...
A completely planar, delocalized 14π-electron system which does not contain cyclically conjugated su...
Cycloadditions to the azulene system have not hitherto been observed. Instead, azulene reacts, e.g.,...
Reaction of dimethyl acetylenedicarboxylate 2a with azulene 1 (boiling tetralin, 207.6 °C) leads to ...
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