反应详情

Citronellal is treated with aqueous sulfuric acid solution of 5 weight % (hereinafter referring to wt. %) in concentration at room temperature to cause the ring closure of citronellal. Then, after the reaction product is extracted with ether or toluene, para-menthane-3,8-diol is obtained by distilling the extract under reduced pressures (J. Am. Chem. Soc., 75, 2367 (1953), examined Japanese Patent Publication 3-80138 and U.S. Pat. No. 5,298,250).

1. extractionThen, after the reaction product is extracted with ether or toluene