发明授权
- 专利标题: Process for producing dimethyltetralin
- 专利标题(中): 生产二甲基儿茶素的方法
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申请号: US09504042申请日: 2000-02-14
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公开(公告)号: US06504069B1公开(公告)日: 2003-01-07
- 发明人: Youichi Kyuuko , Norio Fushimi , Makoto Takagawa
- 申请人: Youichi Kyuuko , Norio Fushimi , Makoto Takagawa
- 优先权: JP11-043455 19990222; JP11-043456 19990222
- 主分类号: C07C1328
- IPC分类号: C07C1328
摘要:
5-Tolyl-pent-2-ene is cyclized in liquid phase in the present of an aliphatic hydrocarbon to produce the corresponding dimethyltetralin. The use of the aliphatic hydrocarbon effectively prevents a side reaction such as dimerization of 5-tolyl-pent-2-ene to provide dimethyltetralin in a high yield. Also, 5-tolyl-pent-2-ene is cyclized in liquid phase or vapor phase in the presence of a catalyst comprising a carrier supporting sulfate ions to produce the corresponding dimethyltetralin. The catalyst supporting sulfate ions shows a high catalytic activity event at low temperatures. Therefore, the cyclization of 5-tolyl-pent-2-ene is conducted in a wide temperature range from low temperatures to high temperatures.
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