Isoquassin
Title: Isoquassin
CAS Registry Number: 21293-20-9
Additional Names: Picrasmin
Molecular Formula: C22H28O6
Molecular Weight: 388.45
Percent Composition: C 68.02%, H 7.27%, O 24.71%
Literature References: Bitter principle from Jamaica quassia, Picrasma excelsa (Sw.) Planch., Simaroubaceae. Isoln: Clark, J. Am. Chem. Soc. 60, 1146 (1938). Identity of isoquassin and picrasmin: Adams, Whaley, ibid. 72, 375 (1950). Isomer of quassin, q.v.: Valenta et al., Tetrahedron 18, 1433 (1962).
Properties: Crystals from methanol, mp 222-225°. [a]D20 +45.4° (chloroform). uv max: 258 nm (e 12500).
Melting point: mp 222-225°
Optical Rotation: [a]D20 +45.4° (chloroform)
Absorption maximum: uv max: 258 nm (e 12500)

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