S1 Supporting information Deprotonation of 1,2-Dialkylpyridinium Ions: A DFT Study of Reactivity and Site-selectivity Neelima Gupta,* Reena Garg, Kirti Kr. Shah, Akhilesh Tanwar and Sourav Pal* Table SI-1 Energies (in a.u.) from B3LYP/6-31++G** level single point calculations on geometries optimized at B3LYP/6-31+G* level of 1a-i (N, N+1 and N-1 systems), Et 3 N, 2a-i and 3a-i . Page S2-S3 Table SI-2 Values of Fukui Function (f k + ) and charge of N-CH2/CH3 and 2-CH2/CH3 hydrogens of pyridinium ions 1a-i from B3LYP/6-31++G** level single point calculations of geometries optimized at B3LYP/6-31+G* level. Page S3-S5 Table SI-3. Cartessian Coordinates of Optimized Geometries at B3LYP/6-31+G* level in Gas phase. Page S6-S17