Limettin
Title: Limettin
CAS Registry Number: 487-06-9
CAS Name: 5,7-Dimethoxy-2H-1-benzopyran-2-one
Additional Names: 5,7-dimethoxycoumarin; citropten
Molecular Formula: C11H10O4
Molecular Weight: 206.19
Percent Composition: C 64.08%, H 4.89%, O 31.04%
Literature References: From rind of fruit of Citrus lima Lunan (C. limetta Auth.), Rutaceae (lime): Tilden, Beck, J. Chem. Soc. 57, 323 (1890); from W. Indian lime oil: Caldwell, Jones, ibid. 1945, 570; from citrus oils: Stanley, Vannier, US 2889337 (1959 to U.S.D.A.). Synthesis: Schmidt, Arch. Pharm. 242, 288 (1904); Heyes, Robertson, J. Chem. Soc. 1936, 1831.
Properties: Needles from methanol, mp 147-148°. uv max (alcohol): 222, 247, 250.5, 324 nm (log e 4.03, 3.84, 3.84, 4.18). Almost insol in boiling water, ether, petr ether. Freely sol in alcohol, chloroform, acetone.
Melting point: mp 147-148°
Absorption maximum: uv max (alcohol): 222, 247, 250.5, 324 nm (log e 4.03, 3.84, 3.84, 4.18)

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