Chatterjea, J. N. published the artcileSynthesis in the 4-azafluorene group. Part III, Safety of 1-(Cyanomethyl)pyridin-1-ium chloride, the publication is Journal of the Indian Chemical Society (1978), 55(2), 149-53, database is CAplus.
Cyclocondensation of benzylideneindandiones I (R = H, Me, MeO, NO2) with NH4OAc in the presence of 1-phenacylpyridinium bromide gave the diindenopyridines II. Hantzsch cyclization of 2-benzylidene-1-indanone with PhC(NH2):CCN gave the dihydroazafluorenone III, which was aromatized by chromic acid, hydrolyzed, and decarboxylated to give the azafluorenone IV (Z = O). Wolff-Kishner reduction of IV (Z = O) gave IV (Z = H2). Treatment of 2-benzylideneindan-1-one with NH4OAc and 1-acetonylpyridinium bromide gave 3-methyl-1-phenyl-4-azafluorene, which was also obtained from Et 3-methyl-1-phenyl-4-azafluorenone-2-carboxylate by successive hydrolysis, decarboxylation, and Wolff-Kishner reduction 1-Benzylidene-2-indanone was prepared from Et 3-benzylidene-2-oxo-1-indancarboxylate by hydrolysis-decarboxylation.
Journal of the Indian Chemical Society published new progress about 17281-59-3. 17281-59-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitrile,Salt, name is 1-(Cyanomethyl)pyridin-1-ium chloride, and the molecular formula is C7H7ClN2, Safety of 1-(Cyanomethyl)pyridin-1-ium chloride.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem