1-(2-Carboxyethyl)-5-ethyl-2-methylpyridinium chloride

In the crystal structure of the title salt, C11H16NO2 +·Cl−, the cations and anions are linked by O—H⋯Cl hydrogen bonds. The structure is further stabilized by weak C—H⋯Cl hydrogen bonds.

In the crystal structure of the title salt, C 11 H 16 NO 2 + ÁCl À , the cations and anions are linked by O-HÁ Á ÁCl hydrogen bonds. The structure is further stabilized by weak C-HÁ Á ÁCl hydrogen bonds.
Experimental 1g (8.3mmol) of freshly distilled 5-ethyl 2-methyl pyridine was dissolved in 10 ml of THF at -10°C under nitrogen atmosphere. To the above solution, 0.8 ml (8.0 mmol) of acrylic acid in 10 ml of THF was added drop wise with continuous stirring. After stirring for 20 min in an ice bath, 0.5 mL of HCl was added and stirred for 24 h. White solid formed after the completion of the reaction and the solid was filtered, washed with THF and dried in vacuum. The product was recrystallized from methanol Yield: 1.52g (80%)

Refinement
All H atoms on carbons were positioned geometrically with C-H distances ranging from 0.95 to 1.00 Å and refined as riding on their parent atoms, with U iso (H) = 1.2Ueq(C) or U iso (H) = 1.5Ueq(C methyl ) The hydroxyl H atom was freely refined.

Special details
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq O2