Abstract Synthetic approaches for modification of negative photochromes of hydroxytricyanopyrrole (HTCP) series were described for the first time. The first and fifth positions of the pyrrole ring were directly functionalized but hydroxyl group of the 2-vinyl-phenol fragment and the butadienetricarbonitrile (BDTC) moiety, which are necessary for the photochromic reaction were untouched. These results are the starting point for wide research in the field of directed synthesis of nitrile rich negative photochromes with tunable physicochemical characteristics. Graphical Abstract

中文翻译：

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羟基三氰基吡咯 (HTCP) 系列的各种取代负光色素的直接合成

摘要 首次描述了羟基三氰基吡咯（HTCP）系列负性光致变色的合成方法。吡咯环的第一个和第五个位置被直接官能化，但光致变色反应所必需的 2-乙烯基苯酚片段和丁二烯三甲腈 (BDTC) 部分的羟基未受影响。这些结果是在定向合成具有可调理化特性的富含腈的负性光致变色领域进行广泛研究的起点。图形概要