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[求助]
求大神幫忙翻譯一段英文！有BB感謝！
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The key intermediate O,O-dialkylisothiocyanato(phenyl)meth-ylphosphonate 5 was prepared according to the literature procedure[12] . In order to improve the yield, the existing method for conver-sion of4 into 5 was further modi fi ed by using Bis(trichloromethyl) carbonate (BTC) instead of phosphorus oxychloride as shown in Fig. 2 . The results obtained with BTC were compared with those obtained with phosphorus oxychloride (Table 1 ). As could be observed from the table, the yields phosphonate 5 in the former case from different alkyl substituents ranged from 67.4e78.6%. The other intermediates involved in the preparation of 5 were obtained as depicted inFig.2[12]. 2.jpg |
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220chengeng: 金幣+2, 感謝應(yīng)助。 2013-01-05 21:26:08
sltmac: 金幣+15 2013-02-26 13:20:41
sltmac: 翻譯EPI+1, 歡迎常來(lái)本版交流 2013-02-26 13:20:47
220chengeng: 金幣+2, 感謝應(yīng)助。 2013-01-05 21:26:08
sltmac: 金幣+15 2013-02-26 13:20:41
sltmac: 翻譯EPI+1, 歡迎常來(lái)本版交流 2013-02-26 13:20:47
| 關(guān)鍵中間體O,O-二甲基硫代磷酰酯5根據(jù)文獻(xiàn)中的步驟制備而成。為提高產(chǎn)率，對(duì)現(xiàn)有方法從4到5的轉(zhuǎn)換加以改進(jìn)，使用二(三氯甲基)碳酸酯(BTC)代替三氯氧磷，如圖2所示。對(duì)使用BTC的結(jié)果與使用三氯氧磷的結(jié)果進(jìn)行了比較（表1）。從表格中可以看出，前一實(shí)驗(yàn)里利用不同烷基取代物得到5瞵酸鹽的產(chǎn)率范圍為67.4e78.6%。制備5所需的另一中間體通過(guò)圖2所示方式得到[12]。 |
2樓2013-01-02 18:15:20
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