有机光致变色材料在光信息储存等现代技术领域有广泛的应用潜力。吲哚啉苯并螺吡喃类化合物是有机光致变色物质中颇受重视的一类。以往的研究工作表明,在这类化合物结构中随着吲哚啉坏上N-烷基碳链的增长而熔点降低、成膜树脂相容性增加;从而有利于提高光致变色片的光密度。因此,研究长链N-烷基化合物的合成是有意义的。合成这类化合物比较方便的路线如下式所示:第一步反应是3H吲哚对碘代烷的亲核取代。由于该亲核试剂对空间位阻过于敏感,故在合成乙基以上碘化物时要求反应必须在封管 Organic photochromic materials have wide potential for use in modern technologies such as optical information storage. Indolomobenzo spiropyran compounds are one of the most valued organic photochromic substances. Previous studies have shown that in the structure of these compounds, the melting point of the N-alkyl carbon chain increases with the increase of the indoline, and the compatibility of the film-forming resin increases; therefore, the optical density of the photochromic sheet is improved . Therefore, it is of interest to study the synthesis of long chain N-alkyl compounds. The convenient route to synthesize these compounds is shown in the following formula: The first step is the 3H-indole nucleophilic substitution of alkyl iodides. Since the nucleophile is sterically hindered by steric hindrance, it is required that the reaction must be carried out in a sealed tube when synthesizing ethyl iodide above