The attempted preparation of thiocarbonyl ylides (I) by the proton abstraction of thiouronium salts (III) has disclosed a fast isomerization of I to enethiols (V)(Y= H) and an alternative desulfurization to enediamines (VII)(Y= Ph), the by-products being olefins (VIII) and sulfides (IX). The second route to I examined consists of the reaction of tetramethylthiourea (II) with diazomalonate, which gives rise to enediamine (VII g). Rotation about the C= C bond of ...
![Di [2.2-bis-(dimethylamino)-1-(ethoxycarbonyl)-vinyl]-disulfid Structure](https://image.chemsrc.com/caspic/162/26394-92-3.png)
