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aaaa4564木虫 (正式写手)
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[交流]
请教一句英语的意思
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文章需要修改，其中一条意见是The assignment of the data in Table 1 should be improved 请问各位大侠这句话的意思是不是“在表1中的数据分配应改善”，也就是说我表中的数据的顺序要调整一下？？ |
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xiaoqihu
铁杆木虫 (著名写手)
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4楼2010-03-05 11:11:23
xiaoqihu
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2楼2010-03-05 10:46:14
aaaa4564
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Table 1. Effect of the alkalies on the condensation of chalcone with malononitrilea Entry Alkali Reaction time (h) Yield(%)b 1 — 6 40 2 NaOH 6 23 3 KOH 6 28 4 Na2CO3 6 67 5 K2CO3 2 95 6 50c 6 NaHCO3 6 70 aMmol ration of chalcone/malononitrile/I2/alkali is 1.0/1.0/0.1/0.1. The reaction was accomplished in MeOH at room temperature; bIsolated yields; cWithout iodine. 下面是对应的分析 First, the condensation of chalcone with malononitrile using molecular iodine as catalyst was examined with several inorganic alkalies catalysts and the results are summarized in Table 1. As shown in Table 1, K2CO3 was more satisfied to obtain excellent yield in short time (entry 5) than other inorganic alkalies. Low yield was obtained and long reaction time was needed using NaOH and KOH as catalysts (entries 2 and 3), this owing to the NaOH and KOH were too strong bases to result in more by-products.[8f] Na2CO3 and NaHCO3 had moderate yields under the same reaction conditions (entries 4 and 6), and they both needed a longer reaction time than K2CO3. However, a long reaction time was needed and low yield was obtained without any base (entry 1) or molecular iodine (entry 5). 我觉得是顺序的问题,可能是我段中没有按1234的顺序分析。。望大家指教 [ Last edited by aaaa4564 on 2010-3-5 at 11:03 ] |
3楼2010-03-05 10:58:42
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5楼2010-03-05 16:36:07
