将使用甲醇甲醇钠的氢交换反应速率k exch M -1 s -1与 四个9-Y苯基芴-9- i H,七个YC 6 H 4 C i的气相酸度ΔG kcal / mol进行比较。H(CF 3)2,七个YC 6 H 4 C i HClCF 3和C 6 F 5 iH.十四种氟化苄基化合物和五氟苯导致接近统一的实验性氢同位素效应,表明与交换过程相关的大量内部回流。尽管9-苯基芴的反应具有实验上的同位素效应,似乎在价值上是正常的,但它们不服从Swain-Schaad关系。这表明它们以少量的内部收益发生。苄基化合物的活化熵ΔS ‡为+12至+14 eu,与9-Y苯基芴基的活化熵ΔS ‡为-8至-12 eu。该Δ小号‡ 五氟苯反应的〜1 eu介于其他化合物之间。密度泛函计算使用B3LYP / 6-31 + G(d,p)的报告为CH的反应3 ø -(HOCH 3)3为C 6 ˚F 5 H,C 6 H ^ 5
A highly efficient method for labeling with deuterium is described using an acidic hydrocarbon as transfer agent. Using 9-[H-2]-9-phenylfluorene as the deuterium donor, numrrous organic compounds have been labeled in fair yields and good isotopic enrichment. (C) 2001 Elsevier Science Ltd. All rights reserved.
Room‐Temperature Palladium‐Catalyzed Deuterogenolysis of Carbon Oxygen Bonds towards Deuterated Pharmaceuticals
作者:Wei Ou、Xudong Xiang、Ru Zou、Qing Xu、Kian Ping Loh、Chenliang Su
DOI:10.1002/anie.202014196
日期:2021.3.15
Site‐specific incorporation of deuterium into drug molecules to study and improve their biologicalproperties is crucial for drug discovery and development. Herein, we describe a palladium‐catalyzed room‐temperature deuterogenolysis of carbon–oxygen bonds in alcohols and ketones with D2 balloon for practical synthesis of deuterated pharmaceuticals and chemicals with benzyl‐site (sp3 C−H) D‐incorporation. The
KHMDS mediated synthesis of 9-arylfluorenes from dibenzothiophene dioxides and arylacetonitriles by tandem S<sub>N</sub>Ar-decyanation-based arylation
作者:Saketh Mylavarapu、Mamta Yadav、M. Bhanuchandra
DOI:10.1039/c8ob02355g
日期:——
A straightforward KHMDS mediated synthetic route to 9-arylfluorenes from readily available starting materials has been developed.
已开发出一种直接的KHMDS介导合成路线,可从易获得的起始材料合成9-芳基芴。
Classical Organic Reactions in Pure Superheated Water
作者:Barbara Kuhlmann、Edward M. Arnett、Michael Siskin
DOI:10.1021/jo00090a030
日期:1994.6
At high temperatures and pressures, pure liquid water becomes a surprisingly effective medium for the reactions of organic compounds. It may function simultaneously as a convenient solvent, catalyst, and reagent for reactions which are typically acid- or base-catalyzed. Rapid and highly selective conversions are observed for the majority of the compounds in this study.
A highly efficient method for labeling with deuterium is described using an acidic hydrocarbon as transfer agent. Using 9-[H-2]-9-phenylfluorene as the deuterium donor, numrrous organic compounds have been labeled in fair yields and good isotopic enrichment. (C) 2001 Elsevier Science Ltd. All rights reserved.
Comparison of gas-phase acidities of some carbon acids with their rates of hydron exchange in methanolic methoxide
作者:Vincent F. DeTuri、Heinz F. Koch、Judith G. Koch、Gerrit Lodder、Masaaki Mishima、Han Zuilhof、Neal M. Abrams、Cecily E. Anders、Justin C. Biffinger、Patrick Han、Adam R. Kurland、Jason M. Nichols、Anne M. Ruminski、Patricia R. Smith、Karen D. Vasey
DOI:10.1002/poc.1057
日期:2006.5
Hydron exchange reaction rates, kexch M−1s−1, using methanolic sodium methoxide are compared with gas-phaseacidities, ΔG kcal/mol, for four 9-YPhenylfluorenes-9-iH, seven YC6H4CiH(CF3)2, seven YC6H4CiHClCF3, and C6F5iH. Fourteen of the fluorinated benzylic compounds and pentafluorobenzene result in near unity experimental hydrogen isotope effects that suggest substantial amounts of internal return
将使用甲醇甲醇钠的氢交换反应速率k exch M -1 s -1与 四个9-Y苯基芴-9- i H,七个YC 6 H 4 C i的气相酸度ΔG kcal / mol进行比较。H(CF 3)2,七个YC 6 H 4 C i HClCF 3和C 6 F 5 iH.十四种氟化苄基化合物和五氟苯导致接近统一的实验性氢同位素效应,表明与交换过程相关的大量内部回流。尽管9-苯基芴的反应具有实验上的同位素效应,似乎在价值上是正常的,但它们不服从Swain-Schaad关系。这表明它们以少量的内部收益发生。苄基化合物的活化熵ΔS ‡为+12至+14 eu,与9-Y苯基芴基的活化熵ΔS ‡为-8至-12 eu。该Δ小号‡ 五氟苯反应的〜1 eu介于其他化合物之间。密度泛函计算使用B3LYP / 6-31 + G(d,p)的报告为CH的反应3 ø -(HOCH 3)3为C 6 ˚F 5 H,C 6 H ^ 5