synthesis of new core-Au/shell-CeO2 nanoparticles (Au@CeO2) using a redox-coprecipitation method, where the Au nanoparticles and the nanoporous shell of CeO2 are simultaneously formed in one step. The Au@CeO2catalyst enables the highly selective semihydrogenation of various alkynes at ambient temperature under additive-free conditions. The core-shellstructure plays a crucial role in providing the excellent
我们报告了一种使用氧化还原共沉淀法轻松合成新的核-Au/壳-CeO2 纳米颗粒(Au@ ),其中 Au 纳米颗粒和 的纳米多孔壳在一个步骤中同时形成。Au@ 催化剂能够在无添加剂的条件下在环境温度下实现各种炔烃的高选择性半氢化。核-壳结构通过最大化核-Au 和壳- 之间的界面位点,以异裂方式选择性解离 H2,从而为烯烃提供优异的选择性。
Stereochemical consequences in the deprotonation of enoates
作者:Paul Galatsis、Jeffrey J. Manwell、Scott D. Millan
DOI:10.1016/0040-4039(96)01144-6
日期:1996.7
A cyclic transition structure for the deprotonation of enoates was proposed to rationalize the geometry of the deconjugated olefin and the substrate reactivity patterns.
[EN] UNIVERSAL METHYLATION PROFILING METHODS<br/>[FR] PROCÉDÉS UNIVERSELS D'ÉTABLISSEMENT DE PROFILS DE MÉTHYLATION
申请人:UNIV COLUMBIA
公开号:WO2016100864A1
公开(公告)日:2016-06-23
The present invention provides a method of determining whether cytosine residues present at a predetermined positions within a singl strand of a double stranded DNA of known sequence are methylated as well as compounds for carrying out this method. The present invention also provides a process of producing a derivative of a double-stranded DNA comprising contacting the double-stranded DNA with a CpG methyltransferase and an S-adenosylmethionine analog.
[EN] UNIVERSAL METHYLATION PROFILING METHODS<br/>[FR] PROCÉDÉS UNIVERSELS DE PROFILAGE DE LA MÉTHYLATION
申请人:UNIV COLUMBIA
公开号:WO2014204861A1
公开(公告)日:2014-12-24
The present invention provides a compound having the adenosylmethionine structure, wherein the sulfur atom of the methionine moiety is modified with alkene or succinimide groups, wherein R1, R2 and R3 are independently H, alkyl, aryl, C(0)NH2, C(0)R', CN, N02, C (O)R', S(0),NHR'; wherein X is 0 or NR'; wherein R' is H, alkyl or aryl; and wherein n is an integer from 1 to 8, with the proviso that, when substituent is a propene derivative, and n is 1, at least one of R1, R2, or R3 is other than H.