Rate constants for hydrogen abstraction from alkoxides by a perfluoroalkyl radical. An oxyanion accelerated processElectronic supplementary information (ESI) available: Tables of kinetic data and plots of kinetic data. See http://www.rsc.org/suppdata/ob/b4/b405074f
作者:Joseph A. Cradlebaugh、Li Zhang、G. Robert Shelton、Grzegorz Litwinienko、Bruce E. Smart、Keith U. Ingold、William R. Dolbier, Jr.
DOI:10.1039/b405074f
日期:——
to measure the absolute bimolecular rateconstants for hydrogenatomabstraction in water from a series of fluorinated alkoxides and aldehyde hydrates by the perfluoroalkyl radical, *CF2CF2OCF2CF2SO3- Na+. The bimolecular rateconstants observed for the beta-fluorinated alkoxides were in the 10(5) M(-1) s(-1) range, such rates representing enhancements (relative to the respective alcohols) of between
激光闪光光解法和竞争动力学方法相结合已用于测量全氟烷基自由基* CF2CF2OCF2CF2SO3- Na +从一系列氟化的醇盐和醛水合物中提取氢原子的绝对双分子速率常数。β-氟化醇盐的双分子速率常数在10(5)M(-1)s(-1)范围内,这种速率代表100到几乎1000倍之间的增强(相对于相应的醇),取决于醇盐的反应性。同样,相对于它们各自的水合物,氯醛和氟代水合物的一元钠盐显示出相似的速率增加。
A Straightforward, Purification-Free Procedure for the Synthesis of Ando and Still–Gennari Type Phosphonates
作者:Ignacy Janicki、Piotr Kiełbasiński
DOI:10.1055/a-1628-7586
日期:2022.1
Z-Selective Still–Gennari and Ando modifications of the typically E-selective Horner–Wadsworth–Emmons reaction are highly valuable synthetic tools in organic chemistry. These procedures are based on application of bis(2,2,2-trifluoroethyl) phosphonates or diaryl phosphonates, respectively, for the olefination of carbonyl groups. In our research, we present an improved, straightforward, purification-free
Chemoselective Activation of Diethyl Phosphonates: Modular Synthesis of Biologically Relevant Phosphonylated Scaffolds
作者:Pauline Adler、Amandine Pons、Jing Li、Jörg Heider、Bogdan R. Brutiu、Nuno Maulide
DOI:10.1002/anie.201806343
日期:2018.10
Phosphonates have garnered considerable attention for years owing to both their singular biological properties and their synthetic potential. State‐of‐the‐art methods for the preparation of mixed phosphonates, phosphonamidates, phosphonothioates, and phosphinates rely on harsh and poorly selective reaction conditions. We report herein a mild method for the modular preparation of phosphonylated derivatives
Late-Stage β-C(sp<sup>3</sup>)–H Deuteration of Carboxylic Acids
作者:Alexander Uttry、Sourjya Mal、Manuel van Gemmeren
DOI:10.1021/jacs.1c06474
日期:2021.7.28
Carboxylicacids are highly abundant in bioactive molecules. In this study, we describe the late-stage β-C(sp3)–H deuteration of freecarboxylicacids. On the basis of the finding that C–H activation with our catalysts is reversible, the de-deuteration process was first optimized. The resulting method uses ethylenediamine-based ligands and can be used to achieve the desired deuteration when using a
A Synthetic Alternative to the Type-II Intramolecular 4 + 3 Cycloaddition Reaction
作者:Richard S. Grainger、Richard B. Owoare、Patrizia Tisselli、Jonathan W. Steed
DOI:10.1021/jo034356f
日期:2003.10.1
Oxyallyl cations generated in situ from dihaloketones have been found to undergo the Favorskii rearrangement in preference to an intramolecular Type-II 4 + 3 cycloaddition reaction in trifluoroethanol and hexafluoropropan-2-ol solvents, generating acrylate esters with high cis selectivity. A synthetic alternative to the intramolecular Type-II 4 + 3 cycloaddition has been developed on the basis of intramolecular