The application of novel hydrophobic ionic liquids to the extraction of uranium(vi) from nitric acid medium and a determination of the uranyl complexes formed
作者:Thomas James Bell、Yasuhisa Ikeda
DOI:10.1039/c1dt10755k
日期:——
predominated. Strongly hydrophobic ILs showed low extractability for nitric acid concentrations below 0.1 M but increasing extractability from 0.1 M to 6 M nitric acid. The predominant mechanism in this case involved the partitioning of a neutral uranylcomplex. The uranylcomplexes were found to be UO22+·(TBP)3 for the cationic exchange mechanism, UO2(NO3)2(TBP)2 for the neutral mechanism and UO2(NO3)3−·(TBP)
PROCESSES OF ENANTIOSELECTIVELY FORMING AN AMINOXY COMPOUND AND AN 1,2-OXAZINE COMPOUND
申请人:Zhong Guofu
公开号:US20110224429A1
公开(公告)日:2011-09-15
Disclosed is a process of enantioselectively forming an aminoxy compound of Formula (3)
In formula (3) R
1
is one of an aliphatic group and an alicyclic group. R
2
is one of hydrogen, an aliphatic group, an alicyclic group, an aromatic group, an arylaliphatic group and an arylalicyclic group. R
3
is one of hydrogen, halogen, hydroxyl, and an aliphatic group with a main chain having 1 to about 10 carbon atoms. The respective aliphatic, alicyclic, aromatic, arylaliphatic or arylalicyclic groups of R
1
, R
2
, and R
3
comprise 0 to about 3 heteroatoms independently selected from the group consisting of N, O, S, Se and Si. The process includes contacting a carbonyl compound of Formula (1)
and a nitroso compound of Formula (2)
in the presence of a chiral catalyst. The chiral catalyst is a compound of Formula (IX)
Alkyl transfer from quaternary ammonium salts to cobalt (I): Model for the cobalamin-dependent methionine synthase reaction
作者:Ellen Hilhorst、Atef S. Iskander、Tjoe B.R.A. Chen、Upendra K. Pandit
DOI:10.1016/s0040-4020(01)85359-x
日期:1994.1
The reaction of cobaloxime(I) with diverse quaternaryammoniumsalts leads, in general, to a group transfer from nitrogen to cobalt. The behaviour of the salts in these transalkylations is consistent with an SN2 mechanism, involving Co(I) as a nucleophile. In a model study of the cobalamin-dependent methionine synthase reaction, 5-13CH3-methyl labelled 5,5,6,7-tetramethyl-5,6.7,8-tetrahydropteridinium
钴肟(I)与各种季铵盐的反应通常导致基团从氮转移到钴。盐在这些烷基转移反应中的行为与S N 2机理一致,涉及Co(I)作为亲核试剂。在钴胺素依赖性蛋氨酸合酶反应的模型研究中,以5- 13 CH 3-甲基标记的5,5,6,7-四甲基-5,6.7,8-四氢idi啶鎓盐(23)-天然辅酶5的模型使-CH 3 H 4-叶酸(1)-与钴肟(I)和钴胺素(I)反应。在每种情况下,通过13 C-NMR光谱。
Colorimetric hydrogel based nanosensor for detection of therapeutic levels of ionizing radiation
申请人:ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITY
公开号:US10428160B2
公开(公告)日:2019-10-01
An apparatus includes a hydrogel including a metallic compound, a surfactant, an acid, agarose and water. The hydrogel is substantially colorless. A radiated hydrogel having a color is formed when the hydrogel receives a low dose of ionizing radiation.