218432-79-2Relevant articles and documents
Reactions between some 6-Halogeno-2,2-dimethyl-, 2,2,6-Trimethyl- and 2,2-Diaryl-2H-naphthopyrans and 1,1-Diphenylethene
Breese, Allan,Cotterill, W. David,Iqbal, Muhammad,Livingstone, Robert
, p. 2101 - 2112 (2007/10/03)
6-Halogeno-2,2-dimethyl- and 2,2,6-trimethyl-2H-naphthopyrans reacted with 1,1-diphenylethene in acidic solution to give 6-halogeno-3,4-dihydro-2,2-dimethyl- and 3,4-dihydro-2,2,6-trimethyl-4-(2,2-diphenylvinyl)-2H-naphthopyrans, respectively, along with their corresponding dimers. However, the reaction between 2,2-diaryl-2H-naphthopyrans and 1,1-diphenylethene, under identical conditions, yielded 4-(2,2-diarylvinyl)-3,4-dihydro-2,2-diphenyl-2H-napthopyrans, by a different mechanism involving ring opening of the pyran ring.