Arylidene semicarbazones and their utility as herbicides
申请人:STAUFFER CHEMICAL COMPANY
公开号:US03753680A1
公开(公告)日:1973-08-21
Substituted-arylidene semicarbazone having the formula:
取代芳基亚胺脲酮的化学式为:
Cascade reaction to 1H-pyrazoles from hydrazones via sodium Ni-trite promoted dual C–C/C–N formation, annulation and aromatization with 1,2-dichloroethane
作者:Liqiang Hao、Hongyan Liu、Zheng Zhang、Fuqiang Wen、Chengcai Xia、Zengfen Pang
DOI:10.1016/j.cclet.2021.02.025
日期:2021.7
Arylidene semicarbizides
申请人:STAUFFER CHEMICAL COMPANY
公开号:US03712914A1
公开(公告)日:1973-01-23
A synthetic approach to 1,3,4-thiadiazolidine-2-thiones
作者:F.C. Heugebaert、J.F. Willems
DOI:10.1016/0040-4020(66)80065-0
日期:1966.1
The course of the reactionbetween dithiocarbazic acid and aldehydes and ketones has been examined. Aliphatic and π-deficient heterocyclic aldehydes and ketones form 1,3,4-thiadiazolidine-2-thiones. Aromatic and π-excessive heterocyclic aldehydes and ketones, however, form azines. A similar course occurs in the reactionbetween the hydrazones and carbondisulphide.
Preparation of 5-Aryl-2-Alkyltetrazoles with Aromatic Aldehydes, Alkylhydrazine, Di-<i>tert</i>-butyl Azodicarboxylate, and [Bis(trifluoroacetoxy)iodo]benzene
directly prepared in good to moderate yields by the reaction of aromatic aldehydes with methylhydrazine and benzylhydrazine, followed by treatment with di-tert-butyl azodicarboxylate and [bis(trifluoroacetoxy)iodo]benzene in a mixture of dichloromethane and 2,2,2-trifluoroethanol at room temperature. The present method is a novel one-pot preparation of 5-aryl-2-methyltetrazoles and 5-aryl-2-benzyltetrazoles