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A Azirines

Photolysis of 2,3-diphenyl-A -azirine (442) generates benzonitrile ylide (443). Irradiation in the presence of ethyl cyanoformate resulted in a mixture of the oxazoline (444) and the imidazole (445) by 1,3-dlpolar cycloaddition to the carbonyl and nitrile group, respectively (72HCA919). [Pg.154]

The barrier to pyramidal inversion in 1 A-azirine (3) has been calculated to be 33-46 kcal mol-1, reflecting the unfavorability of the planar transition state, which is proposed to be antiaromatic (Section 1.01.2). [Pg.8]

A -azirines and pyridinium salts, N-amino- 31, 333 Pyrimidine-5-carboxaldehyde,... [Pg.293]

A -azirines, review 28, 643s31 benzofuran-2(3H)-ones 31,199 bridgehead azides 31,176 heterocyclic salts 31,779... [Pg.295]

Dichlorocarbene addition to the imine (203) gives the 2,2-dichloroaziridine (204), which may lose the benzylic proton in the presence of strong base to provide a potential precursor of the corresponding A -azirine. The first... [Pg.38]

Dipolarophiles, strong A -azirines 26, 706 suppl. 28 Dipoles s. Betaines... [Pg.275]

A -azirines, 2-amino- 27,462 enamines, synthesis 27,846 immoniocyclobutane ring 28,822... [Pg.282]

A -azirines, 2-amina- 31, 667 (a,0-ethylenesulfonyl)-amidines 31,328 nitriles (2 molecules) 31, 611... [Pg.251]

See other pages where A Azirines is mentioned: [Pg.263]    [Pg.271]    [Pg.263]    [Pg.271]    [Pg.471]    [Pg.526]    [Pg.258]    [Pg.223]    [Pg.230]    [Pg.271]    [Pg.271]    [Pg.420]    [Pg.73]    [Pg.75]    [Pg.1000]    [Pg.260]    [Pg.278]    [Pg.290]    [Pg.316]    [Pg.250]    [Pg.250]    [Pg.262]    [Pg.397]    [Pg.243]    [Pg.243]    [Pg.255]    [Pg.455]   


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Azirine

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