Carbon-13 NMR and x-ray structure determination of 1-(arylazo)-2-naphthols. Intramolecular proton transfer between nitrogen and oxygen atoms in the solid state
作者:Alejandro C. Olivieri、Roxy B. Wilson、Iain C. Paul、David Y. Curtin
DOI:10.1021/ja00197a003
日期:1989.7
transfer in 1-(phenylazo)-2-naphthol and its 4prime}-methoxy, ethoxy, and N,N-dimethylamino derivatives has been investigated with variable-temperature solution and high-resolution solid-state sup 13}C NMR spectroscopy. Crystal structures of the parent unsubstituted compound and the 4prime}-N,N-dimethylamino derivative have been determined. All of these compounds undergo a fast proton exchange on the NMR
涉及 1-(苯基偶氮)-2-萘酚及其 4prime}-甲氧基、乙氧基和 N,N-二甲氨基衍生物中单质子转移的互变异构反应已用可变温度溶液和高分辨率固体进行了研究。状态sup 13}C NMR光谱。母体未取代化合物和 4prime}-N,N-二甲氨基衍生物的晶体结构已经确定。所有这些化合物在 NMR 时间尺度上在溶液和结晶相中的互变异构偶氮和腙形式之间进行快速质子交换。固体材料中的平衡组成类似于在溶液中测量的平衡组成。1-(苯基偶氮)-2-萘酚的晶体为单斜晶系,a = 27.875 (7), b = 6.028 (2), c = 14.928 (5) 埃}, β} = 103.57 (2)度},空间群是 C2/c,Z = 8,在 1,082 次观察到的反射中,213 K 的结构被细化为 0.0414 的 R 因子。1-((4prime}-(二甲氨基)苯基)偶氮)-2-萘酚的晶体为单斜晶系,a