<i>N</i>-Heterocyclic Carbene Boryl Radicals: A New Class of Boron-Centered Radical
作者:Shau-Hua Ueng、Andrey Solovyev、Xinting Yuan、Steven J. Geib、Louis Fensterbank、Emmanuel Lacôte、Max Malacria、Martin Newcomb、John C. Walton、Dennis P. Curran
DOI:10.1021/ja904103x
日期:2009.8.12
Reduction of xanthates by N-heterocyclic carbene boranes (NHC-boranes) has been suggested to occur by a radical chain mechanism involving heretofore unknown NHC-boryl radicals. In support of this suggestion, both the expected borane dithiocarbonate product and an unexpected borane xanthate product have now been isolated. These are the first NHC-boranes with boron-sulfur bonds, and their structures
N-杂环卡宾硼烷 (NHC-硼烷) 对黄原酸酯的还原被认为是通过涉及迄今为止未知的 NHC-硼基自由基的自由基链机制发生的。为支持这一建议,预期的硼烷二硫代碳酸酯产品和意外的硼烷黄原酸盐产品现已分离出来。这些是第一个具有硼硫键的 NHC-硼烷,它们的结构已通过光谱和晶体学手段得到保证。通过使用取代的环丁基羰基自由基的开环作为时钟反应来确定从 NHC 硼烷络合物转移 H 原子的第一速率常数。NHC-硼烷与仲烷基在环境温度下反应的速率常数为 4 x 10(4) M(-1) s(-1),并且 Arrhenius 函数显示了双分子反应的典型熵项(log A 项)。NHC-硼烷复合物的 BH 键解离能估计为 88 kcal/mol。EPR 光谱已检测到这些转化中假定的 NHC-硼基自由基。光谱分析表明它是一种π自由基,类似于苄基。
INTERNAL OLEFINIC SULFONATE COMPOSITION AND CLEANSING COMPOSITION CONTAINING THE SAME
申请人:KAO CORPORATION
公开号:US20140080751A1
公开(公告)日:2014-03-20
Provided is an internal olefin sulfonate composition which is capable of exerting good foamability at the same time with foam quality, foam dissipation property, and less irritation to the skin at high levels, and a cleansing composition containing the same.
The internal olefin sulfonate composition of the present invention comprises (A) an internal olefin sulfonate having 16 carbon atoms and (B) an internal olefin sulfonate having 18 carbon atoms, wherein a mass content ratio (A/B) of component (A) to component (B) is from 75/25 to 90/10.
Provided are an internal olefin sulfonate composition which is capable of sufficiently enhancing foamability, foam spreadability, and foam dissipation property, and a cleansing composition containing the same. The internal olefin sulfonate composition comprises (A) an internal olefin sulfonate having 16 carbon atoms and (B) an internal olefin sulfonate having 14 carbon atoms, wherein a content mass ratio of the component (A) to the component (B), (A/B), is from 10/90 to 70/30, and a content of the internal olefin sulfonate having 18 or more carbon atoms is 5% by mass or less.
Ruthenium-Catalyzed Oxidation of Alkenes at Room Temperature: A Practical and Concise Approach to α-Diketones
作者:Shulin Chen、Zhaojun Liu、Erbo Shi、Long Chen、Wei Wei、Hong Li、Yannan Cheng、Xiaobing Wan
DOI:10.1021/ol200716d
日期:2011.5.6
The catalytic oxidation of alkenes to α-diketones is unprecedented. A newoxidation of alkenes, catalyzed by a ruthenium complex, which allows an efficient route to α-diketones using TBHP as an oxidant is described. This methodology is highlyfunctional group tolerant, is practically convenient, requires no additional ligand, and operates under mild conditions with short reaction times. Based upon
Provided is a cleansing composition for skin or hair capable of bringing about a good rinse feel and, in regard to hair, imparting softness to hair during rinsing and after towel drying, and further, imparting a sufficient moist feeling also to skin after application.
A cleansing composition for skin or hair, comprising the following (A) and (B):
(A) an internal olefin sulfonate having 12 or more and 24 or less carbon atoms; and
(B) a cationic polymer or an amphoteric polymer.