Unsymmetrical hydrazo compounds; ##STR1## where (R").sub.3 C-- is a tert-alkyl or tert-aralkyl radical and R.sub.3 and R.sub.4 are hydrogen, lower aliphatic, cycloaliphatic, or an alkylene biradical. Example: ##STR2## These compounds are useful intermediates for preparing the corresponding azo compounds. A process for preparing 1-(R").sub.3 C-- semicarbazide by reacting a urea with t-alkylhydrazine or its acid salt in aqueous medium at 50.degree.-100.degree. C. Example: Urea and t-butylhydrazine HCl were refluxed in water for 4 hours. The solid product was identified as ##STR3##
非对称腙化合物;其中(R").sub.3 C--是三叔丁基或三叔苄基基团,R.sub.3和R.sub.4是氢、低级脂肪、环脂肪或烷基双基。例如:##STR2## 这些化合物是制备相应偶氮化合物的有用中间体。一种制备1-(R").sub.3 C--半卡巴
肼的方法是,在
水性介质中将
尿素与叔-烷基腙或其酸盐反应,在50℃-100℃下进行。例如:在
水中回流
尿素和叔丁基腙HCl 4小时。固体产物被鉴定为##STR3##