Gas-Phase Fragmentation of Deprotonated <i>p</i>-Hydroxyphenacyl Derivatives
作者:Marek Remeš、Jana Roithová、Detlef Schröder、Elizabeth D. Cope、Chamani Perera、Sanjeewa N. Senadheera、Kenneth Stensrud、Chi-cheng Ma、Richard S. Givens
DOI:10.1021/jo1025223
日期:2011.4.1
derivatives HO-C6H4-C(O)-CH2-X (X = leaving group) provides abundant signals for the deprotonated species which are assigned to the corresponding phenolate anions −O-C6H4-C(O)-CH2-X. Upon collisional activation in the gas phase, these anions inter alia undergo loss of a neutral “C8H6O2” species concomitant with formation of the corresponding anions X−. The energies required for the loss of the neutral
对羟基苯甲酰基衍生物 HO-C 6 H 4 -C(O)-CH 2 -X(X = 离去基团)的甲醇溶液的电喷雾电离为去质子化的物质提供了丰富的信号,这些信号分配给相应的酚盐阴离子- OC 6 H 4 -C(O)-CH 2 -X。在气相中碰撞活化时,这些阴离子尤其会经历中性“C 8 H 6 O 2 ”物种的损失,同时形成相应的阴离子 X -. 失去中性所需的能量与共轭酸 (HX) 的气相酸度大致相关。为了揭示形成中性“C 8 H 6 O 2 ”的能量最有利途径,对 X = CF 3 COO进行了广泛的理论研究,提出了三种具有相似能量需求的不同途径,包括螺环丙酮、环氧化物形成和diradical,分别。
[EN] NOVEL NAMPT ENZYME AGONIST AND PREPARATION AND USE THEREOF<br/>[FR] NOUVEAU AGONISTE DE L'ENZYME NAMPT, SA PRÉPARATION ET SON UTILISATION<br/>[ZH] 新型NAMPT酶激动剂及其制备与用途
A stable liquid peracid precursor composition for delivering a bleaching and cleaning material is provided in which the liquid peracid precursor composition combines a dispersion medium which comprises a stabilizing effective amount of a liquid matrix and an emulsifier, and a dispersed phase that comprises a peracid precursor. The bleaching and cleaning material comprises either a hydrophobic or hydrotropic generated mono- or diperoxyacid, or mixtures thereof.
A stable liquid peracid precursor composition for delivering a bleaching and cleaning material is provided in which the liquid peracid precursor composition combines a dispersion medium which comprises a stabilizing effective amount of a liquid matrix and an emulsifier, and a dispersed phase that comprises a peracid precursor. The bleaching and cleaning material comprises either a hydrophobic or hydrotropic generated mono- or diperoxyacid, or mixtures thereof.