Poly-4-vinylpyridinium Poly(Hydrogen Fluoride): A Solid Hydrogen Fluoride Equivalent Reagent
作者:George A. Olah、Xing-Ya Li、Qi Wang、G. K. Surya Prakash
DOI:10.1055/s-1993-25924
日期:——
Poly-4-vinylpyridinium poly(hydrogen fluoride) (PVPHF), containing 35-60% hydrogen fluoride by weight, was prepared as a solid hydrogen fluoride equivalent reagent. PVPHF with 60% hydrogen fluoride by weight was found to be a versatile fluorinating agent for the hydrofluorination and bromofluorination of alkenes and alkynes, fluorination of alcohols as well as other fluorination reactions. Low hydrogen fluoride content PVPHF (3 equivalents of hydrogen fluoride to 1 equivalent of 4-vinylpyridine unit) was also found to be an efficient reagent for bromofluorination of alkenes in the presence of 1,3-dibromo-5,5-dimethylhydantoin. Fluorosulfonic acid-modified PVPHF showed enhanced reactivities for the fluorination of secondary alcohols.
聚-4-乙烯基吡啶聚(氟化氢)(PVPHF)是一种固态氟化氢等效试剂,含有35-60%的氟化氢(按重量计)。发现含有60%氟化氢的PVPHF是一种多功能的氟化试剂,可用于烯烃和炔烃的氟化氢化及溴氟化,醇的氟化以及其他氟化反应。低氟化氢含量的PVPHF(4-乙烯基吡啶单元1当量对应3当量氟化氢)在存在1,3-二溴-5,5-二甲基海因的情况下也被发现是一种有效的烯烃溴氟化试剂。氟磺酸修饰的PVPHF在第二醇氟化反应中显示出增强的反应活性。