Results 151 to 160 of about 57,923 (191)

Dipolar Cycloaddition Reactions of Nitrilimines

Australian Journal of Chemistry, 1998
A series of ?-substituted a-methylidene-?-butyrolactone derivatives underwent regiospecific 1,3-dipolar cycloaddition with N -methyl- C -phenylnitrilimine. These reactions proceeded regiospecifically and with high diastereoselectivity, generally favouring the anti diastereomer as determined by n.m.r.
Dunstan, J., Elsey, G., Russell, R., Savage, G., Simpson, G., Tiekink, E.   +5 more
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Dipolar Cycloadditions of Nitrones in Aqueous Media

HETEROCYCLES, 2016
1,3-Dipolar cycloadditions of nitrones in aqueous media have been recently exploited as a non-conventional protocol in the synthesis of the fully- or partly-saturated isoxazole ring. Water as the reaction medium can affect positively both cycloaddition rates and yields, while the large array of latent functionalities displayed by the cycloadducts is of
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

Dipolar Cycloadditions

2006
M. C. Carreño, M. Ribagorda
openaire   +2 more sources

1,3-Dipolar Cycloadditions

2012
R. P. Singh, L. Deng
  +4 more sources

1,3-Dipolar Cycloaddition

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

Dipolar Cycloadditions

2012
A. Chanda, V. V. Fokin
openaire   +1 more source

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.
openaire   +1 more source

1,3-Dipolar Cycloadditions

2001
J. Gonzalez, W. D. Harman
openaire   +1 more source