A new benzaldehyde from residue left over rectification of star anise oil / 中草药

Objective: To stuey the the chemical constituents from the residue left over the rectification of star anise oil (essential oil from Anisi Stellati Fructus). Methods: Two compounds were isolated from the residue left over the rectification of star anise oil by various chromatographic techniques, such as silica gel, and Sephadex LH-20 column chromatography. Results: Their structures were elucidated on the basis of chemical and spectral data. A new compound was identified to be 4-hydroxy-3-(3-methylbut-3-en-2-yl) benzaldehyde (2), along with a known compound (E)-1,4-bis (4-methoxyphenyl) but-3-en-2-one (1). Conclusion: NMR data of compound 1 are first reported and compound 2 is new one.