Pericyclic Reactions: Further Examples
Pericyclic Reactions: Group Transfer Reactions
The reduction of double bonds with diimide is of synthetic value.
The addition of H atoms from 1,4-cyclohexadiene to anthracene proceeds stereoselectively in cis fashion.
The driving force of the reaction is aromatization of cyclohexadiene to benzene. Loss of aromaticity in the middle ring of anthracene is less important because of the smaller stabilization energy of this ring as compared to benzene (see).