An hydration scale for ketones in polar aprotic solvents
摘要:
已开发了一种适用于水合亚磺酮和二甲基亚砜(DMSO)的水合度标度(W0),代表了溶剂对一系列三氟乙酰苯酮的平衡水合作用的影响;平衡常数与取代基参数σ+相关;ρ+ = -1.62表示脱水。定义为[Formula: see text]的函数W0,在纯水中为零,在99%摩尔分数的亚磺酮中升至2.72。在含水DMSO中,W0在0至85%摩尔分数的DMSO范围内为负值,这意味着这些体系比纯水更多地使酮类化合物水合。
An hydration scale for ketones in polar aprotic solvents
摘要:
已开发了一种适用于水合亚磺酮和二甲基亚砜(DMSO)的水合度标度(W0),代表了溶剂对一系列三氟乙酰苯酮的平衡水合作用的影响;平衡常数与取代基参数σ+相关;ρ+ = -1.62表示脱水。定义为[Formula: see text]的函数W0,在纯水中为零,在99%摩尔分数的亚磺酮中升至2.72。在含水DMSO中,W0在0至85%摩尔分数的DMSO范围内为负值,这意味着这些体系比纯水更多地使酮类化合物水合。
申请人:University of Pittsburgh - Of the Commonwealth System of Higher Education
公开号:US20200078703A1
公开(公告)日:2020-03-12
Described herein are methods and compounds for extracting water from an aqueous solution. For example, some embodiments include method for extracting water from an aqueous solution, comprising contacting the aqueous solution with a compound comprising one or more carbonyl moieties having an equilibrium constant for a hydration of the carbonyl moiety of at least about 0.5; separating a composition comprising the hydrated compound from the aqueous solution; and reacting the hydrated compound to obtain water.
Chemoselective Hydroxylation of Aliphatic sp<sup>3</sup> C–H Bonds Using a Ketone Catalyst and Aqueous H<sub>2</sub>O<sub>2</sub>
作者:Conor J. Pierce、Michael K. Hilinski
DOI:10.1021/ol503410e
日期:2014.12.19
The first ketone-catalyzed method for the oxidation of aliphatic C–H bonds is reported. The reaction conditions employ aryl trifluoromethyl ketones in catalytic amounts and hydrogen peroxide as the terminal oxidant. Hydroxylation is stereospecific and chemoselective for tertiary over secondary C–H bonds. A catalytic cycle invoking a dioxirane as the active oxidant is proposed.