Characterization of Vinyl-Substituted, Carbon−Carbon Double Bonds by GC/FT-IR Analysis
作者:Aleš Svatoš、Athula B. Attygalle
DOI:10.1021/ac960890u
日期:1997.5.1
of carbon-carbon double bonds conjugated with a vinyl group. Cis and trans isomers of unsubstituted 1,3-alkadienes can be differentiated on the basis of the differences observed in the 900-1000 cm-1 region (spectra of cis isomers show two bands at 993 and 906 cm-1, while those of trans compounds show three absorptions at 998, 949, and 902 cm-1) and the 1590-1650 cm-1 region (the C=C stretch bands are
气相红外光谱可以确定与乙烯基共轭的碳-碳双键的立体化学。未取代的1,3-链二烯的顺式和反式异构体可以根据在900-1000 cm-1区域观察到的差异进行区分(顺式异构体的光谱在993和906 cm-1处显示两个条带,化合物在998、949和902 cm-1处和1590-1650 cm-1处显示三个吸收(对于顺式化合物,在1595和1642 cm-1处以及在1604和1650 cm-处观察到C = C拉伸带)反式化合物为1)。带有CH 2 = CHC(CH 3)= CHCH 2-和CH 2 = CHC(= CH 2)-CH 2-结构部分的化合物,称为α-和β-型化合物,经常作为天然产物遇到。对于带有α型基团的化合物,三取代双键的顺式/反式构型可以确定。这两个组在= CH2拉伸振动下在3095-3091 cm-1处吸收是常见的。但是,由于存在两个= CH2基团,β型化合物的谱带相对强度要高得多