Why Pyridine Is More Basic Than Pyrimidine?

2.4 Pyrimidine
Both N are slightly basic. Pyrimidine is less basic than pyridine because of the inductive, electron-withdrawing effect of the second N atom. The pKa of the conjugate acid of pyrimidine is 1.3.

Why is pyridine most basic?

Because of the electronegative nitrogen in the pyridine ring, the molecule is relatively electron deficient. ... This lone pair does not overlap with the aromatic π-system ring, consequently pyridine is basic, having chemical properties similar to those of tertiary amines.

Why pyridine is more basic than Pyrazine?

Pyridine is a weaker base than saturated amines of similar structure because its electron pair is in an sp2-hybridized orbital, and the electron pair is more tightly held by the atom. Protonation of a similar nitrogen atom in pyrimidine is more favorable because the charge is delocalized to the second nitrogen atom.

Chloe Bennett

Chloe Bennett

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