中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | diethyl 2-(3,4-dimethoxybenzylidene)succinate | 289622-16-8 | C17H22O6 | 322.358 |
2,3-双(3,4-二甲氧基亚苄基)丁二酸 | 2,3-bis(3,4-dimethoxybenzylidene)butanedioic acid | 73119-35-4 | C22H22O8 | 414.412 |
—— | 2,3-bis(3,4-dimethoxybenzylidene)butanedioic acid anhydride | 91231-60-6 | C22H20O7 | 396.397 |
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.