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不饱和度又称缺氢指数,即有机物分子与碳原子数相等的开链烷烃相比较,每减少2个氢原子,则有机物的不饱和度增加1,用Ω表示.单键对不饱和度不产生影响,因此烷烃的不饱和度是0(所有原子均已饱和).即烷烃:Ω=0.以此类推一个双键(烯烃、羰基化合物等)贡献1个不饱和度.一个叁键(炔烃、腈等)贡献2个不饱和度.一个环(如环烷烃)贡献1个不饱和度.环烯烃贡献2个不饱和度.一个苯环贡献4个不饱和度.一个碳
Unsaturation, also known as lack of hydrogen index, organic molecules and open-chain paraffins with the same number of carbon atoms compared to each reduction of 2 hydrogen atoms, the organic unsaturation increases by 1, said the single bond to the degree of unsaturation Has no effect, so the degree of unsaturation of the alkane is zero (all atoms are saturated) ie alkane: Ω = 0. One double bond (alkene, carbonyl compound, etc.) contributes to one degree of unsaturation by one bond (Alkynes, nitriles, etc.) contributes two degrees of unsaturation One ring (such as a cycloalkane) contributes one degree of unsaturation The cycloolefin contributes two degrees of unsaturation One benzene ring contributes four degrees of unsaturation One carbon