Results 171 to 180 of about 18,263,514 (224)

Preparation of spirocyclic oxindoles by cyclisation of an oxime to a nitrone and dipolar cycloaddition. [PDF]

Beilstein J Org Chem
Ritchie BL, Longcake A, Coldham I.
europepmc   +1 more source

Stereoselective Synthesis of C‑Glycosylated Pyrrolizidines through Nitrone Cycloadditions. [PDF]

ACS Omega
Franco-Montalban F, Díaz-Gavilán M, Lo Re D, Tamayo JA.   +3 more
europepmc   +1 more source

Transition-state aromaticity and its relationship with reactivity in pericyclic reactions. [PDF]

Beilstein J Org Chem
Fernández I.
europepmc   +1 more source

Synthesis of a Janus pentiptycene containing two thiophene rings using an intramolecular Fagan-Nugent reaction.

Chem Commun (Camb)
Montanaro S, Melvin RL, Elsegood MRJ, Wright IA.   +3 more
europepmc   +1 more source

Tetra-substituted BDPA radicals <i>via</i> click-chemistry and application to liquid-state DNP.

Chem Commun (Camb)
Ahmad IM, Roy P, Kuzhelev A, Sigurdsson ST.   +3 more
europepmc   +1 more source

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Stereoselective Photoredox Catalyzed (3+3) Dipolar Cycloaddition of Nitrone with Aryl Cyclopropane

Angewandte Chemie, 2023
AbstractBy resorting to the principle of remote activation, we herein demonstrate the first photoredox catalyzed (3+3) dipolar cycloaddition of nitrones with aryl cyclopropanes. Key to the fidelity of the reaction resides in a facile manner of substrate activation by single‐electron transfer (SET) oxidation with photoredox catalysis, and the reaction ...
Yao Xu, Hai‐Xiang Gao, Chengkai Pan, Yue Shi, Chi Zhang, Genping Huang, Chao Feng   +6 more
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New Parabanate Products by 1, 3-Dipolar Cycloaddition Reaction (‘Criss-Cross’ Cycloaddition)

High Performance Polymers, 1999
New parabanate products containing 1, 3, 5, 7-tetraazabicyclo[3, 3, 0]octane-2, 6-dione are described. The synthesis of αω-diisocyanato-telechelics starting from two diisocyanates having a preformed parabanic unit using a [3+2] dipolar cycloaddition reaction was studied.
Adrian A Caraculacu, Elena Scorţanu, Georgeta Caraculacu   +2 more
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ChemInform Abstract: [2 + 3]Dipolar Cycloadditions of a Monomeric Thioaldehyde.

Chemischer Informationsdienst, 1986
AbstractThiopivalaldehyd (I) liefert mit den Nitronen (II) und (IV), dem Nitriloxid (VI), der Diazoverbindung (VIII) sowie dem Azomethinimin (X) die stabilen [2 + 3]‐Cycloaddukte (III), (V), (VII), (IX) und (XI).
E. VEDEJS, R. G. WILDE
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Captodative Alkenes in Concerted 1, 3-Dipolar Cycloadditions

1986
The 1, 3-dipolar cycloaddition of an E-/Z-pair of captodative alkenes to a cyclic aldonitrone is demonstrated to occur stereospecifically. Additions of α-(tert-butylthio)acrylonitri le to a series of C, N-diphenylnitrones show a change in regioselectivity upon donor substitution in the C-phenyl-ring.
Dietrich Döpp, Jutta Walter, Sabine Holz   +2 more
openaire   +1 more source