Lithium Alkylamide-Catalyzed Addition Reaction of Alkylamines to Vinyl Monomers. III. Addition Reaction ofp-Substituted Benzylamines to Styrene and Divinylbenzenes
摘要:
研究了烷基酰胺锂催化的对取代苄胺与间二乙烯基苯和对二乙烯基苯的加成反应,以合成新的苯乙烯衍生物。尽管二乙烯基苯具有两个乙烯基,但1:1加合物,N-(对位取代的苄基)乙烯基苯乙胺(6, 8)被发现是选择性制备的。还检查了与苯乙烯的反应作为模型反应。根据动力学研究,对取代苄胺与苯乙烯、间二乙烯基苯和对二乙烯基苯的加成反应的 Hammett p 值在 50 °C 下分别为 -0.72、-0.67 和 -1.1。
A one-atom controlled platinum sub-nanocluster (under 1 nm) was synthesized using a phenylazomethine dendrimer template. This sub-nanocluster (SNC) catalyst exhibits a remarkable catalytic activity during reductive amination compared to the standard platinum nanoparticles of 2.2 ± 0.8 nm under mild conditions and a low catalyst loading. In addition, this catalyst has a remarkable poison-tolerance to amines without adding protic acid.
Cloning and Characterization of the Promoter Region of the Human CD83 Gene
作者:S BERCHTOLD
DOI:10.1078/0171-2985-00128
日期:——
Human CD83 (hCD83) is a glycoprotein expressed predominantly on the surface of dendritic cells (DC). To get insight into the regulation of hCD83 expression, we cloned a 3037 by fragment upstream of the translation initiation codon. Deletion mutants were constructed revealing highest promoter activity in the -261 fragment containing four SP1 binding sites and one NF-kappaB element. Electrophoretic mobility shift assays demonstrated the specific interaction of NF-kappaB factors with the NF-kappaB element as well as specific binding of SP1 and SP3 to the SP1 binding site. The hCD83 promoter was inducible by TNF-alpha. This inducibility was strictly dependent on the intact NF-kappaB element.
Tomaszewski, Miroslaw J.; Warkentin, John; Werstiuk, Nick H., Australian Journal of Chemistry, 1995, vol. 48, # 2, p. 291 - 322
作者:Tomaszewski, Miroslaw J.、Warkentin, John、Werstiuk, Nick H.