Structural Formula Vector Image
Title: Euparin
CAS Registry Number: 532-48-9
CAS Name: 1-[6-Hydroxy-2-(1-methylethenyl)-5-benzofuranyl]ethanone
Additional Names: 6-hydroxy-2-isopropenyl-5-benzofuranyl methyl ketone; 5-acetyl-6-hydroxy-2-isopropenylbenzofuran
Molecular Formula: C13H12O3
Molecular Weight: 216.23
Percent Composition: C 72.21%, H 5.59%, O 22.20%
Literature References: From roots of Eupatorium purpureum L., E. cannabinum L., Compositae: Kamthong, Robertson, J. Chem. Soc. 1939, 925; Jermanowska, C.A. 48, 5848h (1954). Structure: Kamthong, Robertson, J. Chem. Soc. 1939, 933. Synthesis: Ramachandran et al., J. Org. Chem. 28, 2744 (1963). Review: Gizycki, Pharmazie 6, 686 (1951).
Properties: Yellow needles from alcohol, mp 121-122°. uv max (ethanol): 263, 358 nm (e 34400, 5900). Sol in alcohol, benzene, chloroform, ether. Practically insol in water, alkali.
Melting point: mp 121-122°
Absorption maximum: uv max (ethanol): 263, 358 nm (e 34400, 5900)
Derivative Type: Acetate
Molecular Formula: C15H14O4
Molecular Weight: 258.27
Percent Composition: C 69.76%, H 5.46%, O 24.78%
Properties: Prisms from petr ether, mp 80°.
Melting point: mp 80°
Derivative Type: O-Methyl deriv
Additional Names: O-Methyleuparin; 2-isopropenyl-6-methoxy-5-benzofuranyl methyl ketone
Molecular Formula: C14H14O3
Molecular Weight: 230.26
Percent Composition: C 73.03%, H 6.13%, O 20.85%
Properties: Needles from dil alcohol, mp 76-77°. Sol in the usual organic solvents.
Melting point: mp 76-77°

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