Structural Formula Vector Image
Title: Homarine
CAS Registry Number: 445-30-7
CAS Name: 2-Carboxy-1-methylpyridinium inner salt
Additional Names: 1-methyl-2-pyridinium carboxylate; picolinic acid N-methylbetaine; N-methylpicolinic acid
Molecular Formula: C7H7NO2
Molecular Weight: 137.14
Percent Composition: C 61.31%, H 5.14%, N 10.21%, O 23.33%
Literature References: Quaternary ammonium base occurring in tissues of marine animals such as sea urchin, Arabacia pustulosa, jellyfish, Velella spirans, lugworm, Arenicola marina. Isoln: Hoppe-Seyler, Z. Physiol. Chem. 222, 105 (1933). Prepn: Kosower, Patton, J. Org. Chem. 26, 1318 (1961); Quast, Schmitt, Ann. 732, 64 (1970). Review of distribution and function in animals: Brodzicki, Kosmos (Warsaw) 16A, 431- 438 (1967), C.A. 68, 18617v (1968).
Properties: Crystals from methanol. Does not have a melting point, slowly carbonizes when heated. Absorption spectrum: Gasteiger et al., Ann. N.Y. Acad. Sci. 90, 624 (1962).
Derivative Type: Hydrochloride
Molecular Formula: C7H7NO2.HCl
Molecular Weight: 173.60
Percent Composition: C 48.43%, H 4.64%, N 8.07%, O 18.43%, Cl 20.42%
Properties: Fine needles, dec 170-175°. Freely sol in water, less sol in methanol and ethanol.

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