The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Pyridine-3,5-dicarbonitrile( cas:1195-58-0 ) is researched.Computed Properties of C7H3N3.Menke, Jessica L.; McMahon, Robert J. published the article 《Photochemistry of matrix-isolated 5-cyano-2H-pyran-2-one (δ-cyano-α-pyrone) and cyanocyclobuta-1,3-diene》 about this compound( cas:1195-58-0 ) in Canadian Journal of Chemistry. Keywords: photochem matrix isolated cyanopyranone; Dewar lactone produces cyanocyclobutadiene. Let’s learn more about this compound (cas:1195-58-0).
Matrix-isolation photochem. (λ > 299 nm; Ar, 10 K) of 5-cyano-2H-pyran-2-one (5, δ-cyano-α-pyrone) shows complete conversion to a mixture of several ring-opened ketene isomers (6) and a ring-closed Dewar lactone (7), as detected by IR spectroscopy. Subsequent irradiation (λ > 200 nm) causes decarboxylation of the Dewar lactone (7) to produce cyanocyclobuta-1,3-diene (8). Continued irradiation (λ > 200 nm) results in the photodecomposition of cyanocyclobuta-1,3-diene (8) to cyanoacetylene and acetylene. 4-Cyanopyridine (10) was explored as an alternative photochem. precursor to cyanocyclobuta-1,3-diene (8). It was found, however, that 10 does not exhibit observable photochem. under our irradiation conditions.
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