مشخصات پژوهش

عنوان	Synthesis of pyranopyrazoles, benzopyrans, amino-2-chromenes and dihydropyrano[􀀀]chromenes using ionic liquid with dual Brønsted acidic and Lewis basic sites
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	ionic liquid, synthesis, pyranopyrazoles, benzopyrans, amino-2-chromenes, dihydropyrano[ c]chromenes
چکیده	An efficient ionic liquid with both Brønsted acidic and Lewis basic sites, namely 1,4-dimethyl-1- (4-sulphobutyl)piperazinium hydrogen sulphate (IL1), was synthesised and characterised. IL1 is a “green”, homogeneous and reusable catalyst for: i) the synthesis of pyranopyrazoles (Va–Vj) and benzopyrans (VIa–VIj and VIIa–VIIf) at ambient temperature under solvent-free conditions and ii) the synthesis of amino-2-chromenes (VIIIa–VIIIi and IXa–IXi) and dihyropyrano[c]chromenes (Xa– Xi) at 80◦C under solvent-free conditions. The reactions were rapid with excellent product yields. In addition, the double Brønsted acid, 1,4-dimethyl-1,4-bis(4-sulphobutyl)piperazinium hydrogen sulphate (IL2), was prepared to evaluate the cooperation efficiency of their Brønsted acidic and Lewis basic sites as compared with the double Brønsted acidic sites in IL1.
پژوهشگران	داود حبیبی (نفر اول)، عاطفه شمسیان (نفر دوم)، داود نعمت الهی (نفر سوم)