The main component is made of turpe

The main component is made of turpentine massoniana α- pinene, wherein L-α- pinene ee values ​​between 40 and 36% to 50%, optical purity is not high, the conventional method has poor resolution, back to purified difficult. It has been reported by catalytic hydrogenation of 36, 100% conversion, 38-cis-pinane selectivity of 98.3%. in 37 L-β- pinene turpentine Pinus elliottii higher levels can reach 20% to 35%, and after distillation of commercially ee of 37 may be up to 92.1% have been reported in diethylene glycol dimethyl ether with sodium borohydride, boron trifluoride reduction of L-β- pinene, 98 can % obtained in a yield of cis-pinane 38. the pyrolysis step 38, has been reported at a cracking temperature of 580 ℃, dihydromyrcenyl 39 content in the product can reach 71.2%. step preparation of dextrose citronella alcohol 40, has been reported with malonic acid and sodium borohydride malonyloxyborohydride generated by the reaction of sodium borohydride, reaction at 60 deg.] C in THF with 39 in 6 h, the reaction occurs in 100% of the terminal double bond, oxidation 40 mass fraction of 90%, and did not find one generation. the fourth step selectively oxidized with oxygen to give dextrorotatory hydroxy at catalytic tetrapropylammonium perruthenate 4 Mao aldehyde, yield 91% following step process consistent with Takasago (Scheme 10). This route convenient source of starting material, the yield of each step are high, industrial prospects clear [4].