Method for preparing 2,6-dimethyl-2-heptheptence from citronellal through selective decarbonylation reaction

The invention discloses a method for preparing 2,6-dimethyl-2-heptheptence from citronellal through selective decarbonylation reaction. The method comprises the following steps that the citronellal, asolvent, a catalyst and a hydrogen source are added into a reactor; reaction is performed for 1.5 to 2h under the condition with the temperature being 80 to 120 DEG C; a mixed solution is obtained; filtering is performed; filtering liquid is collected; the solvent in the filtering liquid is evaporated; the 2,6-dimethyl-2-heptheptence is obtained, wherein the solvent is one of isopropanol and isopropanol; the catalyst is a high-molecular polymer complexed loaded type nanometer metal catalyst; the hydrogen source is one of formic acid and isopropanol. The citronellal is used as raw materials; the 2,6-dimethyl-2-heptheptence is prepared for the first time; the reaction conditions are mild; the product yield is high; the cost is low; the operation is safe; simplicity and high efficiency are realized; the environmenta