A Simple and Versatile Method for the Synthesis of Acetals from Aldehydes and Ketones Using Bismuth Triflate
作者:Nicholas M. Leonard、Matthew C. Oswald、Derek A. Freiberg、Bryce A. Nattier、Russell C. Smith、Ram S. Mohan
DOI:10.1021/jo0258249
日期:2002.7.1
Acetals are obtained in good yields by treatment of aldehydes and ketones with trialkyl orthoformate and the corresponding alcohol in the presence of 0.1 mol % Bi(OTf)3.4H2O. A simple procedure for the formation of acetals of diaryl ketones has also been developed. The conversion of carbonyl compounds to the corresponding 1,3-dioxolane using ethylene glycol is also catalyzed by Bi(OTf)3.4H2O (1 mol
Formation of Acetals and Ketals from Carbonyl Compounds: A New and Highly Efficient Method Inspired by Cationic Palladium
作者:Enoch A. Mensah、Shawn D. Green、Jesse West、Tyler Kindoll、Brenda Lazaro-Martinez
DOI:10.1055/s-0039-1690497
日期:2019.9
acetals and ketals is described. This methodology relies on the nature of the palladium catalyst to direct the acetalization/ketalization reaction. This new protocol is mild and proceed with a very low catalyst loading at ambient temperatures. The method has been extended to a wide variety of different carbonyl compounds with various steric encumbrances to form the corresponding acetals and ketals in excellent
The present invention relates to a fragrance composition comprising ionic liquids for enhanced evaporation of the perfume raw materials. The invention also relates to methods of use of the fragrance compositions for perfuming suitable substrates, particularly skin and hair.
As part of a study on the antitumor activities of tropolonederivatives prepared from hinokitiol, which naturally occurs in the plants of Chamaecyparis species, effects of aromatic substituents of alpha,alpha-bis(7-hydroxy-5-isopropyltropon-2-yl)toluenes on the activity were examined. Several of the compounds showed high potency in the P388 leukemia assay. 4-Hydroxy analogue 4d showed the most potent
作为研究由扁柏酚类化合物制得的托酚酮衍生物的抗肿瘤活性的一部分,香酚醇是天然存在于Chamaecyparis物种的植物中的,α,α-双(7-羟基-5-异丙基肌醇-2-基)甲苯的芳族取代基的作用对活动进行了检查。几种化合物在P388白血病检测中显示出高效力。4-羟基类似物4d在5 mg / kg剂量下显示出最有效的活性(T / C = 195%)。引入大的取代基,其空间影响阻止了取代的芳族官能团的共面性,导致效力显着降低。进行了高效4-甲氧基类似物4b的X射线结构分析。
Fragrance Compositions Comprising Ionic Liquids
申请人:The Procter & Gamble Company
公开号:US20170121633A1
公开(公告)日:2017-05-04
The present invention relates to a fragrance composition comprising ionic liquids for delayed evaporation of the perfume raw materials. The invention also relates to methods of use of the fragrance compositions for perfuming suitable substrates, particularly skin and hair.