2-Butylsulfanyl-2-alkenals react with alcohols at room temperature in the presence of acid catalysts to give 45–90% of the corresponding acetals. Acetals derived from 2-butylsulfanylpropenal readily undergo hydrolysis at the vinylsulfanyl group (20°C, catalysis by HCl or TsOH) with formation of 2-oxopropionaldehyde O,O- or O,S-acetals in 70–90% yield. Unlike 2-butylsulfanyl-2-propenal O,O-dialkyl acetals, the initial aldehydes and 2,4-dinitrophenylhydrazones derived therefrom are stable to hydrolysis under analogous conditions: the vinyl sulfide moiety remains unchanged even under considerably more severe conditions (100°C, 3 h; HCl, H2SO4, CF3SO2OH, or TiCl4).
在室温下,2-丁
硫基-2-烯醛与醇在酸催化剂的作用下发生反应,生成 45-90% 的相应
缩醛。由 2-丁基
硫代丙烯醛衍生出的
乙醛很容易在
乙烯基硫酰基上发生
水解(20°C,HCl 或 TsOH 催化),生成 70-90% 的 2-氧代
丙醛 O,O-或 O,S-
乙醛。与 2-丁基
硫酰基-2-
丙烯醛 O,O-二烷基
乙醛不同的是,由其衍生的初始醛和 2,4-
二硝基苯肼在类似条件下的
水解稳定性很好:即使在更为苛刻的条件下(100°C,3 小时;HCl、H2SO4、CF3SO2OH 或 TiCl4),
乙烯基硫酰基仍保持不变。