Antimicrobial and plant-growth-regulating triazole derivatives
申请人:Janssen Pharmaceutica N.V.
公开号:US04160838A1
公开(公告)日:1979-07-10
Novel 1-(.beta.-aryl)ethyl-1H-1,2,4-triazole ketals useful for their antimicrobial and plant-growth regulating activities.
新型1-(β-芳基)乙基-1H-1,2,4-三唑缩醛,用于其抗微生物和调节植物生长活性。
Application of poly(vinylphenyltrimethylammonium tribromide) resin as an efficient polymeric brominating agent in the <b>α</b>-bromination and <b>α</b>-bromoacetalization of acetophenones
作者:Bingbing Han、Zubiao Zheng、Dongcheng Zheng、Lei Zhang、Peng Cui、Jianjun Shi、Changjiang Li
DOI:10.1080/00397911.2019.1631348
日期:2019.10.2
Abstract The applications of a new supported tribromide reagent based on poly(vinylbenzyltrimethylammonium hydroxide) resin (Amberlite 717) were reported. This supported tribromide resin was used directly in α-bromination and α-bromoacetalization of acetophenones without any other catalyst under mild conditions. The effects of solvents and the amount of the supported tribromide resin on the reactions
A new process that could directly prepare α-haloacetal of ketones from various ketones with N-halosuccinimide (NBS/NCS) and ethylene glycol in one step without any other catalysts was reported. The effects of solvents, NBS/NCS and reaction temperature were investigated. Under the optimal condition, most of α-haloacetals of ketones were obtained in 90–100% yield.