作者:Geir Kildahl-Andersen、Stine Nalum Naess、Petter B. Aslaksen、Thorleif Anthonsen、Synnøve Liaaen-Jensen
DOI:10.1039/b709535j
日期:——
The reaction of retinoids (retinol, retinyl acetate and anhydroretinol) with Bronsted acids was studied as a model system for the Carr-Price reaction. The anhydroretinylic cation was characterised by VIS and 2D NMR spectroscopy, including an estimate of the charge distribution and region of bond inversion, observed in a mixture of identified E/Z isomers. Products obtained by quenching with NaOMe-MeOH
研究了类维生素A(视黄醇,乙酸视黄酯和脱水视黄醇)与布朗斯台德酸的反应,作为Carr-Price反应的模型系统。通过VIS和2D NMR光谱对脱水维甲酸阳离子进行了表征,包括在鉴定出的E / Z异构体混合物中观察到的电荷分布和键反转区域。用NaOMe-MeOH淬灭获得的产物通过HPLC和MS鉴定。VIS,NMR,EPR,动态光散射和化学淬灭法重新研究了视黄醇(维生素A)和路易斯酸SbCl(3)在饱和氯仿溶液中的经典Carr-Price反应。尽管产品的不稳定性和无法提供有用的NMR光谱表明是自由基阳离子,但EPR结果排除了自由基物质。动态光散射实验 与模型系统相比,显示出Carr-Price配合物的强聚集性,合理化了化学猝灭观察到的低稳定性,NMR问题和二聚作用。VIS数据支持蓝色Carr-Price产品与离域的脱水维甲酸阳离子的结构相似性,并评估了锑配合物的详细结构。