Stannous chloride mediated formation of (9-anthryl)methyl dimers from (halogenomethyl)anthracenes. Ground-state and adiabatic excited-state reversibility of intramolecular [4 + 2] cycloadditions
Stannous chloride mediated formation of (9-anthryl)methyl dimers from (halogenomethyl)anthracenes. Ground-state and adiabatic excited-state reversibility of intramolecular [4 + 2] cycloadditions
previous reports, the colourless products obtained in the preparation of 1,2 bis (9′-anthranyl) ethanes are not the photoisomers 4 but new polycyclic compounds of type 3 which we propose to call lepidopterenes, on account of their suggestive shape.