O. Simonsen et al., A MESOIONIC PYRIDAZINIUM SULFONATE - AN UNEXPECTED REACTION-PRODUCT, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 1150-1152
The title compound is an 'inner' salt: methyl)-4-methyl-1-phenylpyrida
zinium-3-sulfonate, C12H11N3O4S (1). The pyridazinium ring is almost p
lanar and twisted approximately 50-degrees out of the benzene ring pla
ne. The oxime -OH group forms an intermolecular hydrogen bond to one o
f the sulfonate O atoms. The identification of (1) has revealed an unu
sual rearrangement.