Results 111 to 120 of about 25,921 (206)

Stereoselective Intramolecular Azide 1,3-Dipolar Cycloaddition

HETEROCYCLES, 2003
Ethyl (E)-7-azido-6-[bis(tert-butoxycarbonyl)amino]-2-heptenoate undergoes a stereoselective intramolecular azide 1,3-dipolar cycloaddition leading to a stable triazoline. The configuration and the conformation of the triazoline obtained were determined by spectroscopic data and confirmed by molecular mechanics calculations.
Markidis, T., Mikros, E., Kokotos, G.
openaire   +2 more sources

1,3‐Dipolar Cycloaddition of Dipolar Reagents to Bis(styryl) Sulfones.

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
V. Padmavathi, K. Venugopal Reddy, A. Balaiah, T. V. Ramana Reddy, D. Bhaskar Reddy   +4 more
openaire   +1 more source

Synthesis of some isoxazoline, isoxazole and pyrazole carboxylic acids as the precursors of new 1,2-diacyl-1-alkylhydrazines [PDF]

, 2013
A number of isoxazoline, isoxazole and pyrazole carboxylic acids or their esters has been synthesized via the 1,3-dipolar cycloaddition of corresponding nitrile oxides or diazomethane to unsaturated dipolarophiles.
Antonevich, I. P., Katok, Ya. M.
core  

Synthesis of new triazole-based trifluoromethyl scaffolds

Beilstein Journal of Organic Chemistry, 2008
Trifluoromethyl propargylamines react with various azide derivatives to afford 1,4-disubstituted 1,2,3-triazoles through a Huisgen 1,3-dipolar cycloaddition. The reaction is catalyzed by a Cu(I) species in acetonitrile, and the corresponding products are
Michela Martinelli, Thierry Milcent, Sandrine Ongeri, Benoit Crousse   +3 more
doaj   +1 more source

Theory of Distinct Crystal Structures of Polymerized Fullerides AC60, A=K, Rb, Cs: the Specific Role of Alkalis

, 2000
The polymer phases of AC60 form distinct crystal structures characterized by the mutual orientations of the (C60-)n chains. We show that the direct electric quadrupole interaction between chains always favors the orthorhombic structure Pmnn with ...
A. Hüller, A. Hüller, A. M. Rao, A. V. Nikolaev, A. V. Nikolaev, F. Bommeli, H. Alloul, H. Kuzmany, J. Winter, K. F. Niebel, K. H. Michel, L. D. Landau, M. S. Dresselhaus, N. Parsonage, N. W. Ashcroft, O. Chauvet, P. Launois, P. Launois, P. Moret, P. W. Stephens, Q. Zhu, R. A. Cowley, R. M. Lynden-Bell, R. Migoni, S. C. Erwin, S. Pekker, S. Rouzière, T. M. de Swiet   +27 more
core   +1 more source

Cyaphide-Azide 1,3-Dipolar Cycloaddition Reactions: Scope and Applicability. [PDF]

Chemistry, 2023
Yang ES, Mapp A, Taylor A, Beer PD, Goicoechea JM.   +4 more
europepmc   +1 more source

Decarboxylative 1,3-dipolar cycloaddition of amino acids for the synthesis of heterocyclic compounds. [PDF]

Beilstein J Org Chem, 2023
Zhang X, Ma X, Zhang W.
europepmc   +1 more source

Asymmetric formal [1 + 2 + 2]-cycloaddition of diazoamides with enamines and carbonyl compounds

Nature Communications
Cycloaddition reaction offers an ideal and powerful method for the construction of cyclic structures with molecular complexity and diversity.
Shanliang Dong, Minghan Yao, Yunzhe Wang, Xiongda Xie, Xinyu Jiang, Xinfang Xu   +5 more
doaj   +1 more source

Competing [2 + 3] and [4 + 3] cycloadditions of C,N-diphenylnitrone with 1,3-dienes. Evidence for thermally nonequilibrated intermediates [PDF]

, 1989
Baran, Janusz, Mayr, Herbert
core   +1 more source

Highly Regioselective 1,3-Dipolar Cycloaddition of Nitrilimines and Thioaurones Towards Spiro-2-Pyrazolines: Synthesis, Characterization, and Mechanistic Study

Reactions
In this paper, we report a highly regioselective 1,3-dipolar cycloaddition (1,3-DC) reaction of nitrilimines with thioaurone derivatives that afforded the hitherto unreported spiropyrazolines. Spectroscopic and spectrometric data were utilized to confirm
Mohamed Bakhouch, Bouchra Es-Sounni, Ayoub Ouaddi, Khaoula Oudghiri, Mohammed Chalkha, Lahoucine Bahsis, Taoufiq Benali, Mohamed Bourass, Rabiaa Fdil, Mohamed Akhazzane, Mohamed El Yazidi   +10 more
doaj   +1 more source