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Optoelectronic Semiconductor Device 专利
专利号: US20130307015A1, 申请日期: 2013-11-21, 公开日期: 2013-11-21
作者:  HOEHN, KLAUS
收藏  |  浏览/下载:7/0  |  提交时间:2019/12/30
Phase-transfer catalytic preparation of 9-fluorenone involves mixing fluorine with xylene with alkali solution as catalyst, adding quat.-ammonium salt, stirring, introducing oxygen-containing gas, cooling, crystallizing, and filtering. 专利
申请日期: 2013-01-01, 公开日期: 2013-12-11
作者:  YAN J YU L LI H GAO Z HE Y
收藏  |  浏览/下载:2/0  |  提交时间:2019/12/13
Preparing 9-fluorenone from industrial fluorine using e.g. alkali catalyst comprises e.g. dissolving industrial fluorene and quaternary ammonium salt in toluene to prepare oil phase, preparing aqueous phase alkali solution, mixing, layering. 专利
申请日期: 2013-01-01, 公开日期: 2013-12-25
作者:  LI H JUNG D YU L GAO Z HE Y
收藏  |  浏览/下载:3/0  |  提交时间:2019/12/13


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