Pyridoxal
Title: Pyridoxal
CAS Registry Number: 66-72-8
CAS Name: 3-Hydroxy-5-(hydroxymethyl)-2-methyl-4-pyridinecarboxaldehyde
Additional Names: 3-hydroxy-5-(hydroxymethyl)-2-methylisonicotinaldehyde; 2-methyl-3-hydroxy-4-formyl-5-hydroxymethylpyridine
Molecular Formula: C8H9NO3
Molecular Weight: 167.16
Percent Composition: C 57.48%, H 5.43%, N 8.38%, O 28.71%
Literature References: Synthesis and structure: Harris et al., J. Biol. Chem. 154, 315 (1944); J. Am. Chem. Soc. 66, 2088 (1944).
 
Derivative Type: Hydrochloride
Molecular Formula: C8H9NO3.HCl
Molecular Weight: 203.62
Percent Composition: C 47.19%, H 4.95%, N 6.88%, O 23.57%, Cl 17.41%
Properties: Rhombic crystals, mp approx 165° with decompn. Soluble in water (1 g/2 ml); sol in 95% ethanol (1.7 g/100 ml); pH of 1% water soln = 2.65. The water solns are sensitive to heat. uv max: 292.5 nm (E mol 7600). Can be reduced to pyridoxine hydrochloride (mp 206-208°).
Melting point: mp approx 165° with decompn; Can be reduced to pyridoxine hydrochloride (mp 206-208°)
Absorption maximum: uv max: 292.5 nm (E mol 7600)
 
Derivative Type: Monoethylacetal hydrochloride
Additional Names: 1,3-Dihydro-1-ethoxy-6-methylfuro[3,4-c]pyridin-7-ol hydrochloride
Molecular Formula: C10H14ClNO3
Molecular Weight: 231.68
Percent Composition: C 51.84%, H 6.09%, Cl 15.30%, N 6.05%, O 20.72%
Properties: Crystals from alcohol and ether, mp 142-143°.
Melting point: mp 142-143°

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