中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
4-羟基-6,7-二甲氧基-2-萘羧酸 | 1-Hydroxy-6,7-dimethoxynaphthalene-3-carboxylic acid | 23673-56-5 | C13H12O5 | 248.235 |
5-甲酰基-4-羟基-6,7-二甲氧基萘-2-羧酸 | 2,3-Dimethoxy-6-carboxy-8-hydroxynaphthalene-1-carboxaldehyde | 126274-96-2 | C14H12O6 | 276.246 |
New photochromic 3-thienyl-3H-naphtho[1,2-b]pyrans fused to lactone and indole rings were efficiently prepared using a one-pot acid-catalyzed reaction, at room temperature, as the key step. These colorless photoswitches acquire intense red/brown shades under UV light and return spontaneously to the colorless state in the dark. The combination of the 3 heterocyclic rings assures a broad and intense absorption in the visible region and it allows a full switch between the two states in less than 1 min, at room temperature.