Publication

About bases and superbases

Manfred Schlosser
1996
Journal Articles

Abstract

A review with 26 refs. on the authors work on metalation by bases and superbases. BuLi requires activation to become capable of abstracting a proton from weakly acidic hydrocarbons like cyclopropanes, simple olefins, or arenes. The addn. of stoichiometric amts. of KOCMe3 is a most effective means of enhancing the rate of a H/metal exchange. Superbasic alkyllithium/K alcoholate mixts. are endowed not only with an unsurpassed reactivity but also with a surprisingly high selectivity as evidenced by series of optionally site-selective arene metalations. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/2c451508-2e6c-421d-9929-fa7e4331b16d

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Manfred Schlosser
1996
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2c451508-2e6c-421d-9929-fa7e4331b16d

About this result

Related concepts (11)

Acid

An acid is a molecule or ion capable of either donating a proton (i.e. hydrogen ion, H+), known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. The first category of acids are the proton donors, or Brønsted–Lowry acids. In the special case of aqueous solutions, proton donors form the hydronium ion H3O+ and are known as Arrhenius acids. Brønsted and Lowry generalized the Arrhenius theory to include non-aqueous solvents.

Superacid

In chemistry, a superacid (according to the original definition) is an acid with an acidity greater than that of 100% pure sulfuric acid (), which has a Hammett acidity function (H0) of −12. According to the modern definition, a superacid is a medium in which the chemical potential of the proton is higher than in pure sulfuric acid. Commercially available superacids include trifluoromethanesulfonic acid (), also known as triflic acid, and fluorosulfuric acid (), both of which are about a thousand times stronger (i.

Ion exchange

Ion exchange is a reversible interchange of one kind of ion present in an insoluble solid with another of like charge present in a solution surrounding the solid with the reaction being used especially for softening or making water demineralised, the purification of chemicals and separation of substances. Ion exchange usually describes a process of purification of aqueous solutions using solid polymeric ion-exchange resin. More precisely, the term encompasses a large variety of processes where ions are exchanged between two electrolytes.

Related publications (1)

About bases and superbases

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Three chloro(trifluoromethyl)pyridines as model substrates for regioexhaustive functionalization