The reaction of
1-(4-methoxyphenyl)-2,2-dimethyldiazopropane with sulphur dioxide in benzene at
5? gave a 54% yield of 2,5-di-t-butyl- 2,5-bis(4-methoxyphenyl)-Δ3-1,3,4-thiadiazoline
1,1-dioxide (4a). The n.m.r, spectra of this and the analogous compounds from
1-(4- chlorophenyl)-, and 1-(3,4,5-trimethoxyphenyl)-diazopropane,
showed temperature dependence due to restricted rotation of the aryl groups.
The energy barriers associated with this process were determined.��� Structural factors profoundly influence the
course of the reaction of 1-aryldiazoalkanes with sulphur dioxide. For example,
1-adamantyl-1- (4-methoxyphenyl)diazomethane gave no detectable amount of the
thiadiazoline derivative, but an almost quantitative yield of 1-(4- methoxybenzoyl)-adamantane.
反应
1-(4-甲氧基苯基)-2,2-二甲基二氮丙烷与二氧化硫在苯中于
5? 的条件下与二氧化硫在苯中反应,得到了产率为 54%的 2,5-二叔丁基-2,5-双(4-甲氧基苯基)-Δ3-1,3,4-噻二唑啉(4a)。
1,1-二氧化物 (4a)。该化合物和以下类似化合物的 n.m.r.光谱
1-(4-氯苯基)- 和 1-(3,4,5-三甲氧基苯基)- 二氮丙烷的类似化合物、
由于芳基旋转受限,该化合物显示出温度依赖性。
结构因素对 1-芳基-3,4,5-三甲氧基苯基-二氮丙烷的反应过程影响深远。
结构因素深刻影响着 1-芳基重氮烷烃与二氧化硫的反应过程。例如
例如,1-金刚烷基-1-(4-甲氧基苯基)重氮甲烷在与二氧化硫的反应中不会产生可检测到的
噻二唑啉衍生物,但几乎可以定量生成 1-(4-甲氧基苯甲酰基)-金刚烷。