β-DDB及其衍生物的结构与红外光谱特征

The Structures and Characteristic Infrared Spectra of β-DDB and Its Derivatives

总结归属了肉豆蔻醚酸甲酯、 6 Br 肉豆蔻醚酸甲酯、β DDB (6 ,6′ 二甲氧基 4,5 ,4′,5′ 二次甲二氧基 2 ,2′ 二甲氧羰基联苯 )及其 5种衍生物的主要红外吸收谱带和特征 ,讨论了其红外吸收频率随化合物结构变化的规律。结果表明分子中酯基的改变主要对羰基的伸缩振动频率有较大影响 ,而对苯环的骨架振动影响较小 ;当苯环上H原子被其他取代基取代时 ,羟基及苯环的骨架吸收均发生显著变化。

The characteristic infrared bands of the 3,4-methylenedioxy-5-methoxybenzoate,6-Br-3,4-methylenedioxy-5-methoxybenzoate, β -DDB (6,6′-dimethoxy-4,5,4′,5′-dimethylenedioxy-2,2′-dimethoxycarbonylbiphenyl) and its five derivatives were assigned .The efects of the substituents of these compounds on their IR data were discussed.The results indicated the varying of ester alkyl mainly influences the CO double band stretching mode,but has little effects on the CC double band stretching mode of the phenyl.When the H atom was substituted by other substituents,the absorptions of the CO and CC both changed.