A synergistic catalytic method combining photoredox catalysis, hydrogen‐atom transfer, and proton‐reduction catalysis for the dehydrogenative silylation of alkenes was developed. With this approach, a highly concise route to substituted allylsilanes has been achieved under verymildreactionconditionswithout using oxidants. This transformation features good to excellent yields, operational simplicity
Carbohydrates as chiral auxiliaries in enantioselective synthesis of four stereoisomers of optically active α,γ-substituted γ-butyrolactones
作者:Wei Wang、Yuwu Zhong、Guoqiang Lin
DOI:10.1016/s0040-4039(03)00900-6
日期:2003.6
Using several easily accessed and inexpensive chiral auxiliaries derived from carbohydrates, allfourstereoisomers of the optically active α,γ-substituted γ-butyrolactones were obtained respectively in highenantiomericpurities (up to 96% ee for trans and up to >99% ee for cis) by the SmI2-induced reductive coupling reaction in the presence of a proton source.
The Effect of Drug Loading on Micelle Properties: Solid‐State NMR as a Tool to Gain Structural Insight
作者:Manuela Callari、Paul L. De Souza、Aditya Rawal、Martina H. Stenzel
DOI:10.1002/anie.201701471
日期:2017.7.10
information on the structure of micelles. Extensive solid‐state NMR measurements were therefore employed to reveal that the drug loading affected swelling and mobility of core and shell of the micelle. The results obtained from solid‐state NMR spectroscopy could explain all the observations on this system. In summary, solid‐state NMR spectroscopy is an excellent tool to understand the effects of drug
Hydrogele auf der Basis von fluorhaltigen und Saccharid-Monomeren
申请人:CIBA-GEIGY AG
公开号:EP0374752A2
公开(公告)日:1990-06-27
Die Erfindung betrifft ein Hydrogel, welches ein Copolymer aus einem polymerisierbaren Monomerengemisch ist, das
a) 2-85 Mol-% eines hydrophoben Vinylmonomeren mit mindestens drei Fluoratomen,
b) 2-80 Mol-% eines hydrophoben Polyhydroxyvinylmonomeren, dessen Hydroxygruppen in geschützter Form vorliegen
c) 2-70 Mol-% eines hydrophilen Vinylmonomeren und
d) bezogen auf die Gesamtmenge der Monomere a)-c), 0-5 Mol-% eines Vernetzers enthält, in welchem Hydrogel die Hydroxygruppen der durch die Monomere b) gebildeten Segmente in geschützter oder in freier Form vorliegen.
Diese Hydrogele können z.B. als Kontaktlinsen, Intraokularlinsen oder in anderen Anwendungsgebieten, bei denen biologisch verträgliche Materialien erforderlich sind, verwendet werden.
本发明涉及一种水凝胶,它是一种可聚合单体混合物的共聚物,该单体混合物具有以下特性
a) 2-85摩尔的疏水性乙烯基单体,该单体至少具有三个氟原子、
b) 2-80 摩尔%的疏水性聚羟基乙烯基单体,其羟基以保护形式存在
c) 2-70 摩尔%的亲水性乙烯基单体和
d) 0-5 摩尔%的交联剂(以单体 a)-c) 的总量为基准),在该交联剂中,由单体 b) 形成的片段的羟基以受保护或游离的形式存在。
这些水凝胶可用作隐形眼镜、眼内镜片或其他需要生物相容性材料的应用领域。
Kossmehl, Gerhard; Volkheimer, Juergen, Liebigs Annalen der Chemie, 1989, p. 1127 - 1130