Photocycloaddition with diphenylacetylene

Naphthalene undergoes photocycloaddition with diphenylacetylene to produce (63) and (64), with the latter thought to result through light absorption by product (63)<78) ... [Pg.236]

Naphthalenes also undergo 1,2-photocycloaddition with diphenylacetylene, although the products isolated are not benzocyclo-octatetraenes, but rather adducts... [Pg.27]

The tetrahydro-2-quinolone (212) affords a very small yield of 1,2-cycloadduct on irradiation with diphenylacetylene in methanol.189 The two major products are the 1,4-dimer and the pentacyclic derivative (213), arising presumably by intramolecular photocycloaddition... [Pg.52]

The second product (21) in the reaction of the diester (equation 70) results from 1,3-addition to the aromatic ring. Such addition is the major mode of reaction for benzene/alkene photocycloadditions, but with alkynes it is less common. One of the few reported examples is the addition of diphenylacetylene to esters of trimesic acid (equation 71),... [Pg.29]

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