A Highly Efficient Friedel–Crafts Reaction of Tertiary α‐Hydroxyesters or α‐Hydroxyketones to α‐Quaternary Esters or Ketones
作者:Long Chen、Jian Zhou
DOI:10.1002/asia.201200693
日期:2012.11
A catalytic Friedel–Crafts arylation of α‐hydroxyesters or α‐hydroxyketones with electron‐rich aromatic compounds to furnish α‐quaternaryesters/ketones has been developed. The cheap and easy to handle catalyst HClO4 (70 %, aq) was identified as a powerful catalyst for this arylation reaction.
Friedel-Crafts Arylation of α-Hydroxy Ketones: Synthesis of 1,2,2,2-Tetraarylethanones
作者:Anil Kumar、Tej V. Singh、Sajesh P. Thomas、Paloth Venugopalan
DOI:10.1002/ejoc.201403438
日期:2015.2
Friedel-Crafts arylation of a-hydroxy ketones such as 2-hydroxy- 1,2,2-triarylethanones has been achieved with a variety of arenes and heteroarenes in the presence of Lewis or Bronsted acids. Both sterically hindered and unhindered 1,2,2,2-tetrarylethanones are formed in good to excellent yields by using a stoichiometric amount of triflic acid. The intermediacy of an a-keto carbenium ion has been proposed
Pinacol-Pinacolone Rearrangement on FeCl<sub>3</sub>Modified Montmorillonite K10
作者:Ajit B. Shinde、Nilesh B. Shrigadi、Ramakrishna P. Bhat、Shriniwas D. Samant
DOI:10.1081/scc-120027268
日期:2004.1
Abstract Pinacol-pinacolonerearrangement was investigated over Fe-modified montmorillonite K10 catalysts in liquid phase. Exceptional activity was found to be associated with FeCl3 impregnated on K10 through its acetonitrile solution. 100% conversion of benzopinacol was observed in 10 minutes. The catalysts are recyclable.
The Formation of Trianisylmethylcarbonium Ion by the Interaction of Tetraanisylethylene with Electron Acceptors<sup>1</sup>
作者:Robert E. Buckles、Ronald E. Erickson、John D. Snyder、Willis B. Person
DOI:10.1021/ja01495a014
日期:1960.5
[EN] TRANS-ACTING ELEMENTS FOR INTRACELLULAR DELIVERY OF NUCLEIC ACID SEQUENCES<br/>[FR] ÉLÉMENTS TRANSACTIVATEURS POUR L'ADMINISTRATION INTRACELLULAIRE DE SÉQUENCES D'ACIDES NUCLÉIQUES