Synthesis and Fluorescence Properties of α,α′-Bis(substituted-benzylidene)cycloalkanones Catalyzed by 1-Methyl-3(2-(sulfooxy)ethyl)-1<i>H</i>-imidazol-3-ium Chloride
α,α′-Bis(substituted-benzylidene)cycloalkanones were synthesized via a solvent-free cross-aldol condensation of aromatic aldehydes with cycloalkanones in the presence of a catalytic amount 1-methyl-3(2-(sulfooxy)ethyl)-1H-imidazol-3-ium chloride at room temperature with excellent yields. The screening for optical properties indicated that the size of cycloalkanone has an influence on the fluorescence
Sulfonated PEG-intercalated montmorillonite [(Mt/PEG)-SO3H] as efficient and ecofriendly nanocatalyst for synthesis of α,α′-bis(substituted benzylidene)cycloalkanones
150 °C, showing excellent potential for application as a recyclable nanocatalyst. (Mt/PEG)-SO3H was used as an efficient and ecofriendly solid acid nanocatalyst for preparation of α,α′-bis(substitutedbenzylidene)cycloalkanones under solvent-free conditions, leading to many interesting findings. The excellent conversion values confirm that the catalyst has strong and sufficient acidic sites, which are
Abstract Tunable organometallic Lewisacidcatalysts were developed by combining salicylic acid (H2-Sal) with benzoic acid (H-Ben), 4-fluorobenzoic acid (H-BenF) and 3-thiophenic acid (H-Th), as coligands for mixed bis-carboxylate titanocene complexes. Three air-stable complexes [Cp2Ti(η1-HSal)(η1-Ben)] (1), [Cp2Ti(η1-HSal)(η1-BenF)] (2) and [Cp2Ti[η1-HSal][(η1-Th)] (3) were prepared in high yields
摘要 以水杨酸 (H2-Sal) 与苯甲酸 (H-Ben)、4-氟苯甲酸 (H-BenF) 和 3-噻吩酸 (H-Th) 作为混合配体,开发了可调有机金属路易斯酸催化剂。双羧酸二茂钛络合物。三种空气稳定配合物 [Cp2Ti(η1-HSal)(η1-Ben)] (1), [Cp2Ti(η1-HSal)(η1-BenF)] (2) 和 [Cp2Ti[η1-HSal][(η1- Th)] (3) 通过水杨酸二茂钛螯合物与羧酸盐配体的反应以高产率制备。通过物理化学和光谱方法充分表征了混合的双羧酸二茂钛配合物。单晶 X 射线衍射研究揭示了 Ti-O(H-Sal) 键距分别为 1.972(3)、1.9245(18) 和 1.912(5) Å,而键距涉及1、2 和 3 的配体为 1.908(3) Å (Ti-OBen)、1.9296(19) Å (Ti-OBenF) 和 1。分别为 945(5) Å (
Synthesis of α,α′-Bis(Substituted Benzylidene)Cycloalkanones Catalyzed by Amino-Functionalized Ionic Liquid
Condensation of aromatic aldehydes with cyclopentanone and cyclohexanone using amino-functionalizedionicliquid, 1-aminoethyl-3-methyl tetrafluoroborate as solvent and catalyst was successfully performed for preparation of α,α′-bis(substitutedbenzylidene)cycloalkanones. The catalyst can be recovered and reused for at least three times without apparently lose of activity. The process is simple, environmentally