The photolysis of 4-methyl-3-(2-hydroxyphenyl)chrom-3-enes(1) in methanol at 300 nm affords 4b,9b-dihydro-4b, 9b-dimethylbenzofuro[3, 2-b]benzofurans (2), in good yield and the reaction rate is accelerated by sodium methoxide.
4-
甲基-3-(2-羟
苯基)chrom-3-enes(1)在
甲醇中于300 nm处光解得到4b,9b-dihydro-4b,9b-二
甲基苯并呋喃[3,2- b ]
苯并呋喃(2) ,收率好,
甲醇钠可加快反应速度。