Results 161 to 170 of about 264,075 (214)

1,3-Dipolare Cycloaddition

1994
Von Huisgen 1,2) wurde 1963 die 1,3-dipolare Cycloaddition 3–5) als Reaktionsprinzip zum Aufbau von Heterocyclen systematisiert. Man versteht darunter die Addition eines 1,3-Dipols 1, der aus den verschiedenen Kombinationen von Kohlenstoff-, Stickstoff- und Sauerstoffatomen bestehen kann und vier nicht dienische π-Elektronen umfast, an eine ...
Thomas Laue, Andreas Plagens
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1,3‐Dipolar cycloadditions to alkyldicyanamides

Recueil des Travaux Chimiques des Pays-Bas, 1981
AbstractThe 1,3‐dipoles 2,4,6‐trimethylbenzonitrile oxide and benzyl azide react with alkyldicyanamides (1) to give the 3,5‐disubstituted 1,2,4‐oxadiazoles 2 and the 1,5‐disubstituted tetrazole 4, respectively, by (3 + 2)‐cycloaddition. The structure of 4 has been determined by a single crystal X‐ray analysis.
P. H. Benders, D. N. Reinhoudt, D. M. W. van den Ham   +2 more
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1,3-dipolar cycloadditions to oxidopyraziniums

Tetrahedron Letters, 1987
Abstract 1,5-Dimethyl-3-oxidopyrazinium (6) undergoes cycloadditions with methyl acrylate, acrylonitrile, diethyl maleate, maleimide, methyl propiolate and diethyl acetylenedicarboxylate.
Miklos Kiss, John Russell-Maynard, John A. Joule   +2 more
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Concertedness of 1,3-dipolar cycloadditions

Journal of Chemical Education, 1984
The 1,3-dipolar cycloaddition is the union of a 1,3-dipole with a multiple bond system (a dipolarophile) to form a five-membered ring; the process is regarded as one of the most general methods for the synthesis of five-membered heterocycles.
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1,3-Dipolar Cycloadditions

2012
Y. Liu, P. Melchiorre
  +4 more sources

1,3-Dipolar Cycloaddition

2012
M. Terada, N. Momiyama
  +4 more sources

1,3-dipolar cycloadditions with porphyrins

2009
The objective of this work is to use 1,3-dipolar cycloadditions to synthesize novel aromatic compounds based on meso-phenyl substituted porphyrins. These compounds are potential photosensitizers for use in photodynamic therapy. Tetraphenylporphyrins with a variety of substituents were reacted with selected 1,3-dipoles.
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Asymmetric 1,3-Dipolar Cycloaddition Reactions

Chemical Reviews, 1998
Kurt V., Gothelf, Karl Anker, Jørgensen
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1,3-Dipolar Cycloaddition

2002
G. Hajos, Z. Riedl
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1,3-Dipolar Cycloadditions

2001
J. Gonzalez, W. D. Harman
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