A facile and efficient visible-light-mediated method for directly converting 1. 4-naphthoquinones into dihydrocyclo-buta[b]naphthalene-3. 8-diones (DHCBNDOs) under mild and clean conditions without using any photocatalysts is reported. This approach exhibited favorable compatibility with functional groups and afforded a series of DHCBNDOs with excellent regioselectivity and high yields. https://bellfordtoysandhobbiers.shop/product-category/wooden-toy/