The ruthenium-catalyzed oxidation of alkanes with tert-butylhydroperoxide and peracetic acid gives the corresponding ketones and alcohols highly efficiently at room temperature. The former catalytic system, RuCl(2)(PPh(3))(3)-t-BuOOH, is preferable to the oxidation of alkylated arenes to give aryl ketones. The latter system, Ru/C-CH(3)CO(3)H, is suitable especially for the synthesis of ketones and
Ruthenium-catalysed oxidation of alkanes with peracetic acid in trifluoroacetic acid: ruthenium as an efficient catalyst for the oxidation of unactivated C–H bonds
KF-Promoted copper-catalyzed highly efficient and selective oxidation of methane and other alkanes with a dramatic additive effect
作者:Luyao Liu、Wu Fan、Wei Chen、Xiaoyan Chen、Suhua Li
DOI:10.1039/d1cy00474c
日期:——
Highly efficient oxidation of methane to methyltrifluoroacetate mediated by CuCl/KF/K2S2O8 in trifluoroacetic acid (TFA) and trifluoroacetic anhydride (TFAA) is described. The additive effect has been systematically evaluated and potassium fluoride (KF) was identified as the most effective promoter among the salts screened. KF is conjectured to exhibit the salt effect to promote the [SO4˙]− radical
描述了在三氟乙酸 (TFA) 和三氟乙酸酐 (TFAA) 中由 CuCl/KF/K 2 S 2 O 8介导的甲烷高效氧化成三氟乙酸甲酯。已经系统地评估了累加效应,并且在筛选的盐中,氟化钾 (KF) 被确定为最有效的促进剂。基于对照实验,推测KF表现出盐效应以促进[SO 4 ˙] -自由基逃离溶剂笼。环己烷和金刚烷也可以有效地氧化成苯或相应的三氟乙酸盐。
N-Adamantane-substituted tetrapeptide amides
申请人:G. D. Searle & Co.
公开号:US04273704A1
公开(公告)日:1981-06-16
N-Adamantane-substituted tetrapeptide amides and the pharmacologically acceptable salts thereof are disclosed herein. These compounds are analogs of enkephalin wherein the methionine or leucine of position 5 has been substituted by an adamantyl amide and the glycine of position 2 has been substituted by various amino acid residues. Optionally the tyrosine of position 1 and the phenylalanine of position 4 may be substituted by various amino acid residues. These compounds exhibit agonist activity at opiate receptor sites and are useful as analgesics.