Abstract: Photoexcitations of 2-allyl-1-naphthol and 1-allyl-2-naphthol caused cyclization, forming dihydrofuranyl and pyranyl ethers and the secondary photodehydrogenation of the dihydrofuranyl ethers. The quenching experiments of the product formations as well as fluorescence intensities of allylnaphthols by methanol, triethylamine, N- nitrosodimethylamine, and 1, 3-dienes confirmed that the cyclization occurred from the ...
![3,4-dihydro-2H-benzo[h]chromene Structure](https://image.chemsrc.com/caspic/399/3722-87-0.png)