| 摘要 |
PURPOSE: To obtain the subject compound having a spiropyran skeleton in which specific positions are bridged with a lower alkylene group, excellent in heat stability and photo responsibility and useful for an optical recording material. CONSTITUTION: This is a compound expressed by formula I (R<1> to R<4> are each H, a lower alkyl, an aryl, an aralkyl, a lower alkoxy, a hydroxymethyl, carboxyl, a halogen, an amide, an amino, cyano, a trihalomethyl or nitro; R<5> and R<6> are each H, a lower alkyl, an aryl, an aralkyl, a halogen, cyano or nitro; X is O or S; Y is a lower alkylene). For example, 1,8'-(4-butanoic acid methylene)-3,3'-dimethyl-6'-nitrospiro[(2'H)-1'-benzopyran-2,2'-indoli ne]. Further, an objective compound is preferably obtained e.g. by subjecting an indoline derivative of formula II to a condensation reaction with a 3-chloromethyl-5- nitrosalicyl aldehyde derivative of formula III and passing through processes including a reaction of the obtained intermediate with silver nitrate, etc. |
