Stevens rearrangement - Wikipedia
The Stevens rearrangement in organic chemistry is an organic reaction converting quaternary ammonium salts and sulfonium salts to the corresponding amines or sulfides in presence of a strong base in a 1,2-rearrangement.
The Stevens Rearrangement: - Organic Chemistry Reaction
2024年11月21日 · Stevens rearrangement is a base-promoted [1,2]-migration rearrangement of quaternary ammonium salts or sulfonium salts to the corresponding tertiary amines or sulfides. Stevens rearrangement involves the [1,2]-migration of …
Stevens Rearrangement - an overview | ScienceDirect Topics
Stevens rearrangement involves the conversion of quaternary ammonium salts or sulfonium salts resulting in the formation of homoallylic amines or thioethers, which usually takes place in the presence of a base.
Stevens Rearrangement - an overview | ScienceDirect Topics
This type of rearrangement, now commonly referred to as the Stevens rearrangement, or Stevens [1,2]-shift, has the unique ability to generate many different types of nitrogen containing compounds.
The mechanism of the Stevens and Sommelet−Hauser Rearrangements…
2010年5月11日 · The [1,2] and [2,3] migration steps in the Stevens and Sommelet−Hauser rearrangements which occur in the ylides of quaternary ammonium salts have been studied at M05-2x levels. The Stevens migration has been found to take place through a diradical pathway in several cases (tetramethylammonium, benzyltrimethylammonium ...
On the Mechanism of the Stevens Rearrangement - Thieme
The reaction mechanism for the Stevens rearrangement is one of the most controversial reaction mechanisms in organic chemistry. This account will address that controversy reviewing the experimental as well as some computational results. 1 Introduction. 2 Evolution of the Mechanistic Knowledge. 2.1 Stevens (1928) 2.2 Stevens (1930) 2.3 Stevens ...
Stevens Rearrangement A quaternary ammonium salt containing an electron-withdrawing group Z on one of the carbons attached to the nitrogen is treated with a strong base to give a rear-ranged tertiary amine. Cf. Sommelet–Hauser rearrangement. The contemporary radical mechanism: The original ionic mechanism:
Difluorocarbene-induced [1,2]- and [2,3]-Stevens rearrangement …
2024年6月5日 · Here, the authors present a methodology that uses a difluorocarbene unit to induce a Stevens rearrangement, which enables smooth inclusion of allylic and propargyl moieties in the transformation.
Stevens rearrangement - chemeurope.com
The Stevens rearrangement in organic chemistry is an organic reaction converting quaternary ammonium salts and sulfonium salts to the corresponding amines or sulfides in presence of a strong base in a 1,2-rearrangement.
In a recent post, I told the story of how in the early 1960s, Robert Woodward had encountered an unexpected stereochemical outcome to the reaction of a hexatriene, part of his grand synthesis of vitamin B12.