The invention discloses a method for preparing
borneol diene. The method comprises the following steps of: taking alpha-
pinene and liquid
bromine as reaction raw materials, controlling the temperature at -70 to 10 DEG C, dripping a
bromine solution at
constant speed when stirring, reacting for 8 to 28h and preparing crude 2,6-dibromo
alkyl camphene; and taking the crude 2,6-dibromo
alkyl camphene as a
raw material, adding a proper
solvent and a proper
elimination reagent, controlling the temperature at 60 to 120 DEG C, stirring, reacting for 1 to 6h, cooling to
room temperature and carrying out
water washing,
petroleum ether extraction and liquid division operation on reaction liquid sequentially so as to prepare the
borneol diene after circulating for many times. The preparation method of the
borneol diene adopts a liquid-liquid homogeneous
reaction system, reduces the processes and the devices of gas generation, introduction,
tail gas absorption and the like, lowers the production cost, reduces the
pollution and is more beneficial to industrialized operation; and the yield of the 2,6-dibromo
alkyl camphene is enhanced to 28.3 percent, the highest conversion rate of converting the 2,6-dibromo alkyl camphene to the borneol diene is 99.1 percent, and the invention has obvious economic benefit.