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- Four bromocarbazoles were synthesized through direct bromination method.They were separated by normal phase HPLC.The purity of the product was determined. 用直接溴化法合成了4种不同取代的溴代咔唑。首次用正相高效液相色谱对它们的纯度进行了检验,并分离了这一系列化合物。
- The effects of different solvents, temperatures, concentrations and catalysts on the ratio of p-bromophenol,o-bromophenol and 2,4-dibromophenol in the direct bromination of phenol. 研究了在惰性非极性溶剂和部分惰性极性溶剂中,以苯酚为原料进行直接溴化反应的溶剂效应、温度效应、浓度效应及催化剂的选择效应。
- Effects of Orientation in the Direct Bromination of Phenol 苯酚直接溴化的定位效应
- She cast her eyes down to avoid direct eye contact. 她垂下双目以避免对视。
- I'll book you on a direct flight to London. 我将为你预订直飞伦敦的航班。
- He has chosen the most direct route. 他选取了最直的路线。
- She's very direct, believes in speaking her mind. 她为人直率,喜欢有什么说什么。
- Can you direct me to the shoe department? 请告诉我卖鞋部在哪里。
- Be there a direct train for Beijing to Nanning? 从北京到南宁有直达车吗?
- See that direct heat does not play on it. 当心别让它直接受热。
- It's a long way by road the train is more direct. 走公路很远--乘火车近。
- Would you please direct me to the zoo? 请问去动物园怎么走?
- My eyes were blinded by the direct rays of light. 在光线的直射下,我看不清楚东西。
- Her opinions are the direct opposite of mine. 她的意见与我的截然相反。
- She is in direct contact with the general manager. 她与总经理直接联系。
- I'm in direct contact with the hijackers. 机者保持著直接的联系。
- The army is under the king's direct command. 军队由国王直接统率。
- Give me a direct answer, and stop evade the issue. 给我一个直截了当的回答,不要回避这一问题。
- He took a direct flight to New York. 他搭乘直航班机到纽约。
- Can you direct me to the police office? 你能告诉我去警察局怎么走吗?