Novel deoxy-selenylconduritols: chemoenzymatic synthesis and biological evaluation
摘要:
The first synthesis of two selenyldeoxycyclitols (4-bromo-2-phenylselenyl conduritol F and 6-phenylselenylconduritol F) is reported via a chemoenzymatic enantioselective route. The key step of the synthesis is the selenolysis of a vinyl epoxide. The new compounds were evaluated for their capacity to inhibit the growth of different microorganisms using a modification of the agar diffusion technique with thin layer chromatography plates as support. (C) 2009 Elsevier Ltd. All rights reserved.
derivatives of tert-butyl and tert-amyl hydroperoxides were obtained in reactions of azo acid chlorides with hydroperoxides in the presence of an inorganic base. Obtained azo-peresters possess two kinds of the labile functional groups: the azo group and also the perester group. The data from DSC experiments indicate that in the case of azo-perester derivatives of tert-amyl hydroperoxide, the perester group
Aggregation in Aqueous Poly(<i>N</i>-isopropylacrylamide)-<i>block</i>-poly(ethylene oxide) Solutions Studied by Fluorescence Spectroscopy and Light Scattering
copolymers poly(N-isopropylacrylamide)-block-poly(ethyleneoxide), PNIPA-b-PEO, were synthesized by free radical polymerization using macroazoinitiators bearing PEO chains with two different chain lengths (Mw = 550 or 1900 g/mol). The molar mass of the PNIPA block varied from 0.4 × 105 to 7.3 × 105 g/mol. The cloud points of the aqueous copolymer solutions shifted to slightly higher temperatures only with
Modified Colorants and Inkjet Ink Compositions Comprising Modified Colorants
申请人:Cabot Corporation
公开号:US20160075880A1
公开(公告)日:2016-03-17
The present invention relates to a modified colorant comprising a colorant having attached at least one organic group. Various embodiments of the organic group are disclosed. For each of these embodiments, preferably the organic group has a defined calcium index value. Also disclosed are various uses for these modified colorants, including inkjet ink compositions.
Emulsion Polymerization of <i>N</i>-Ethylacrylamide in Supercritical Carbon Dioxide
作者:Weijun Ye、Joseph M. DeSimone
DOI:10.1021/ma048863q
日期:2005.3.1
Herein, we report the emulsionpolymerization of a water-soluble vinylic monomer in supercriticalcarbondioxide. The water-soluble/CO2-insoluble monomer, N-ethylacrylamide, was effectively emulsified in CO2 continuous phase using an amphiphilic diblock copolymer consisting of a d-glucose-containing glycopolymer and a fluorinated block. The resulting high yield (>90%) of water-soluble poly(N-ethylacrylamide)
在此,我们报道了水溶性乙烯基单体在超临界二氧化碳中的乳液聚合。使用由含d-葡萄糖的糖聚合物和氟化嵌段组成的两亲性二嵌段共聚物,在CO 2连续相中有效地乳化了水溶性/ CO 2不溶单体N-乙基丙烯酰胺。水溶性聚N的高收率(> 90%)(-乙基丙烯酰胺)以稳定的聚合物胶体形式获得,该胶体由亚微米级的颗粒组成。粒径和粒径分布受各种反应参数的影响。较高的温度和较高的表面活性剂和引发剂浓度导致颗粒尺寸较小。使用了两种引发剂2,2'-偶氮二异丁腈(AIBN)和氟化的偶氮衍生物双-[2-(F-辛基)乙基] -4,4'-偶氮双-4-氰基戊酸酯,并对其进行热分解。研究了超临界CO 2中的行为。与AIBN引发的体系相比,由氟化偶氮引发剂引发的乳液聚合显示没有聚合的单体液滴,并且所得颗粒更均匀。
Energy Transfer Studied Using Spin Polarized Free Radicals. Effect of Substrate Structure and a Comparison Between Micellar Confinement and Free Solution
作者:Vanessa P McCaffrey、Malcolm D.E Forbes
DOI:10.1016/s0040-4020(00)00521-4
日期:2000.9
of the chemically induced dynamic electron polarization (CIDEP) in the TREPR spectrum describes the multiplicity of the radical pair precursor, and therefore the spectrum carries with it information about the energy transfer mechanism. This principle is established by way of a direct, quantitative relationship between the singlet precursor CIDEP intensity and the singlet lifetime. As the size of the