At last, changed the route of synthesis, improved the yield of bromination and etherifying.Made the yield be raised from 62.5 % to 91 %, and made the cost of production lower.

• 并对其进行了工艺改进；使得溴化和醚化收率明显提高；得收率由62.；5%25提高到91%25；生产成本大大降低。