Results 61 to 70 of about 1,216 (196)

Ethyl 2-(Diisopropoxyphosphoryl)-2H-azirine-3-carboxylate: reactions with Nucleophilic 1,3-Dienes [PDF]

, 2012
Ethyl 2-(diisopropoxyphosphoryl)-2H-azirine-3-carboxylate, the first example of an azirine bearing simultaneously ester and phosphonate groups was generated in situ and reacted with a number of 1,3-dienes.
Alves, Maria José Chão, Lemos, A.
core   +1 more source

2H-Pyrrole und Pyrrole aus 3-Phenyl-2H-azirinen

CHIMIA, 1976
Vinyl-phosphonium salts [2] and phenyl-vinyl-sulfone or divinylsulfone react with benzonitril-methylides a (which are photochemically generated from 3-phenyl-2H-azirines 1 and 2) to give, via the nonisolated intermediates of type b, 2H-pyrrole 4 and the
Ulrich Widmer, Nikolas Gakis, Bruno Arnet, Heinz Heimgartner, Hans Schmid   +4 more
doaj   +1 more source

When Dark States Become Bright: Vibronic Intensity Borrowing in Triplet 2,6‐Dichloro‐4‐Hydroxyphenylnitrene

Journal of Physical Organic Chemistry, Volume 39, Issue 7, July 2026.
Irradiation of 4‐azido‐2,6‐dichlorophenol in cryogenic matrices generates triplet 2,6‐dichloro‐4‐hydroxyphenylnitrene. Vibronically structured absorption enables extension of a formally forbidden transition into the visible region (up to 500 nm). Analyses based on NICS(1.7)zz, ACID, HOMA, MCI, and spin density reveal magnetically induced ring currents ...
Dharma Raj Joshi, Anindya Borah, Dmitrii Govorov, Trevor Henry, Bruce S. Ault, Anna D. Gudmundsdottir   +5 more
wiley   +1 more source

Azirines. III. The Preparation of Azirine Derivatives by the Base-Catalyzed Rearrangement of Quaternary Hydrazones [PDF]

Bulletin of the Chemical Society of Japan, 1968
Abstract An attempt to prepare azirines by the base-catalyzed rearrangement of some quaternary hydrazones gave the corresponding azirine derivatives. Namely, 2-phenyl-3-methylazirine was obtained by the treatment of propiophenone dimethylhydrazone methiodide with potassium t-butoxide, but treatment with sodium isopropoxide gave 2,5 ...
openaire   +1 more source

1,1‐Disubstituted Vinylbromides: Versatile Building Blocks for the Synthesis of Nitrogen‐Containing Heterocycles

European Journal of Organic Chemistry, Volume 29, Issue 23, 16 June 2026.
1,1‐Disubstituted vinylbromides are key intermediates for constructing nitrogen‐containing heterocycles. This review provides an overview of the synthetic applications of 1,1‐disubstituted vinylbromides and summarizes recent developments in reaction methodologies, mechanistic insights, and the structural diversity of N‐heterocyclic compounds accessible
Anne Westermeyer, Jun Fang, Chonghuo Liu, Guillaume Lefèvre, Gérard Guillamot, Phannarath Phansavath, Virginie Ratovelomanana‐Vidal   +6 more
wiley   +1 more source

Synthesis of Aib-containing cyclopeptides via the 'azirine/oxazolone method' [PDF]

, 2009
The cyclic pentapeptide cyclo[Gly-Phe(2Me)-Aib-Aib-Gly], containing three α,α-disubstituted α-amino acids, was prepared by cyclization of H-Gly-Phe(2Me)-Aib-Aib-Gly-OH with diphenylphosporazidate (DPPA) in 60% yield. The synthesis of the linear precursor
Dannecker-Dörig, I, Linden, Anthony; https://orcid.org/, Heimgartner, H   +2 more
core   +1 more source

Kupferkatalysierte, hochgradig enantioselektive Addition eines Siliciumnukleophils an 3‐substituierte 2H‐Azirine unter Verwendung eines Si‐B‐Reagenzes

, 2023
3-Substituierte 2H-Azirine können als gespannte cyclische Ketimine angesehen werden, und hochgradig enantioselektive Additionsreaktionen von Siliciumnukleophilen an acyclische und auch cyclische Ketimine sind bislang nicht erreicht worden.
Oestreich, Martin, Irran, Elisabeth, Zhao, Zhi‐Yuan, Cui, Ming   +3 more
core   +1 more source

Push–Pull Ynamines and Push–Pull Ynamides: Synthesis, Structure, Reactivity, and Application

European Journal of Organic Chemistry, Volume 29, Issue 19, 22 May 2026.
Push–pull ynamines and push–pull ynamides, which carry an EWG and an amino or amido group as EDG, are highly interesting classes of EDG‐EWG alkynes that have been intensively studied due to their exceptional reactivity. In this review, the synthesis, structure, reactivity, and application of push–pull ynamines, push–pull ynecarbamates, push–pull ...
Hans‐Joachim Gais
wiley   +1 more source

The reaction between 2,3-Diphenyl-2H-azirine and Phenyldiazomethane

, 1973
The reaction between 2,3-diphenyl-2H-azirine and phenyldiazomethane produces the stable 1-azido-1,2,3-triphenylprop-1-ene in good yield. The structure is confirmed by an alternative synthesis which indicates that the double bond has the E-configuration.
AD Ward, B Nussey, JH Bowie
core   +1 more source

University of Zurich Hosts Symposium in Honor of Professor Heinz Heimgartner

CHIMIA, 2006
The Institute of Organic Chemistry of the University of Zürich hosted a symposium in honor of Prof. Heinz Heimgartner on June 9, 2006. PO Dr. Simon M. Ametamey, Dr. Kurt Dietliker, Prof. Grzegorg Mloston, Dr. Daniel Obrecht, Prof.
Annette Rahm
doaj   +1 more source