Mass spectra pyridazines

The mass spectrum of pyridazine is simple and high resolution measurements have shown that the ion at m/e 52 is composed of both (73.5%) and C3H2N (26.5%) ions ... 

The mass spectral fragmentation pattern for (50) (70JHC639) and its X-ray crystal structure (78AX1136) have been reported. The most abundant spedes in the mass spectrum of (50) is the [yVf-56] ion which corresponds to the loss of four nitrogens. The X-ray picture of (50) indicates it is a planar molecule with a great deal of alkenic character assodated with the double bonds of the pyridazine ring. 

The anhydride of 23-dicarboxypyrazine heated with hydrazine hydrate under various conditions gave some 5,8-dihydroxypyrazino[2,3-silica tube gave an 80% yield of an approximately 1 1 mixture of maleonitrile and fumaronitrile and the mass spectrum of the anhydride (14) was consistent with the formation of the dehydropyrazine (17) (1341). 

Numerous workers7,98,99,232 have reported that a variety of substituted pyrrolol l,2-6 pyridazines give a visible parent ion in the mass spectrum. No reports have yet appeared on a more detailed analysis of the mass spectra of this ring system. 

High-pressure mass spectrometry was used to measure the equilibration constants for the electron transfer between di- and polyalkylpyridazines and their cation radicals (88JA7945). Mass-resolved excitation spectrum was also used to determine the lifetime of the Rydberg state of pyridazine (95JCP4907). 

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See also in sourсe #XX -- [ , ]

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