描述了在四氢呋喃(THF)/己烷或THF / Me 2 NEt溶液中,二异丙基氨基钠(NaDA)介导的芳烃金属化。对超过40种具有一系列取代基的基于苯并吡啶和吡啶的芳烃的研究表明,其金属化的功效和区域选择性都很高。活化的二取代的芳烃和选定的单取代的芳烃在-78°C时快速金属化。1,3-二甲氧基苯和相关甲氧基化芳烃的速率研究表明,基于单体的原金属具有两个或三个配位的THF配体。苯和具有弱活化基团的单取代芳烃的同位素交换速率研究表明,类似的二溶剂化和三溶剂化的单体基金属化反应。讨论了协同的诱导,消旋,空间和螯合作用。
Disclosed are electrochemical methods to prepare an alkane or an alkene, such as a cis- alkene, from an alkyne, or an alkane from an alkene. The method utilizes an electrochemical cell having a cathode and an anode and a reactor.
pK<sub>a</sub>s of the conjugate acids of N-heterocyclic carbenes in water
作者:Eleanor M. Higgins、Jennifer A. Sherwood、Anita G. Lindsay、James Armstrong、Richard S. Massey、Roger W. Alder、AnnMarie C. O'Donoghue
DOI:10.1039/c0cc03367g
日期:——
pKa values of 19.8–28.2 are reported for the conjugate acids of a large series of NHCs in water. The effects of ring size, N-substituent and C(4)–C(5) saturation on pKa are discussed.
Compounds or enantiomers of formula (I) or a salt thereof: wherein R1, R2, R3, R4 and R5 are as defined herein, are useful for the manufacture of a medicament for the treatment or prevention of respiratory syncytial virus infection in a mammal.
propargylamines (see picture) in a predictable manner through competitive pathways. The system enables the cost‐efficient synthesis of a variety of enaminones from readily accessible small molecules and demonstrates the versatility of the acetylide ion, which can be used to bridge electrophiles and nucleophiles.