A new 1, 3-dipolar cycloaddition reaction with formaldoxime as a 1, 3-dipole compound has been discovered. Stereospecificity of the reaction and mass spectral data are discussed. With ethyl propiolate, 3, 5-diethoxycarbonylpyridine, formed via a 1, 4-dipolar cycloaddition reaction, was obtained.
[Dalgard, N. K. A.; Larsen, K. E.; Torssell, K. B. G. Acta Chemica Scandinavica, Series B: Organic Chemistry and Biochemistry, 1984 , vol. 38, # 5 p. 423 - 432]
