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Dehydroannulenes acetylene-cumulene

Expanded porphycene 80 containing triple bonds inserted between the 2 and 2 positions of the 2,2 -biyrrole subunits (1990ACI1385,1990ACI1387) is a 22it-electron aromatic macrocycle that displayed an acetylene-cumulene bonding motif, a feature in common with Sondheimer-Nakagawa [4n+2]dehydroannulenes. [Pg.131]

Dehydroannulene anions and cations Acetylene-cumulene Dehydroannulenes... [Pg.121]

The temperature-independent H-n.m.r. spectra of 302 indicate the rigid nature of the molecular framework of acetylene-cumulene dehydroannulenes. The H-n.m.r. spectrum of monodehydro[22]annulenc- exhibits signals of outer protons at r 1-55-3-75 and those of inner protons at t 6-55-9-30. A much stronger diatropicity... [Pg.179]


See other pages where Dehydroannulenes acetylene-cumulene is mentioned: [Pg.167]    [Pg.168]    [Pg.443]    [Pg.158]    [Pg.163]   


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Cumulenes

Cumulenic

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