Synthesis Of Myrac Aldehyde From Myrcene

In order to increase the concentration of para-myrac aldehyde in myrac aldehyde to improve fragrance characteristic, in the dissertation, SnCl₄·5H₂O is selected as the catalyst of synthesis of myracaldehyde from myrcene from AlCl₃, ZnCl₂, FeCl₃·6H₂O, SnCl2·2H2O, SnCl₄·5H₂O. The reaction is done respectively in ether, THF, mixture of THF and H2O, H2O and without solvent. At the same time, solvent selection test is done at 0⁴0℃catalyzed by SnCl₄·5H₂O. A good result can be attained catalyzed by SnCl₄·5H₂O without solvent.Catalyzed by SnCl₄·5H₂O, mole ratio of myrcene and acraldehyde is 1∶1.8, reaction temperature is 2℃,addition time of myrcene is 5h, reaction time is 3h, a good result is attained. The average yield is 89%, rude product's average p/m value achieve 33 ,p/m:97∶3 after being purified by chromatogram, 15(91∶6) after being purified by rectifying tower. The test attains good selectivity by simple catalyst; meanwhile, amplificative tests further prove the technological parameter feasible and valid.