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tosn鐵桿木蟲 (職業(yè)作家)
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[求助]
求助翻譯一段英語
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如題，求高手翻譯�。�！ 20130529221832.jpg |
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tosn
鐵桿木蟲 (職業(yè)作家)
- 應(yīng)助: 0 (幼兒園)
- 金幣: 10633.7
- 散金: 26
- 帖子: 3074
- 在線: 558.8小時
- 蟲號: 392642
- 注冊: 2007-06-05
- 性別: GG
- 專業(yè): 有機合成
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General procedure for the reductive alkylation of methylamine A mixture of the carbonyl compound (10 mmol), titanium(IV) isopropoxide (5.9 cm3, 20 mmol), methylamine hydrochloride (1.35 g, 20 mmol) and triethylamine (2.79 cm3, 20 mmol) in absolute ethanol (15 cm3) was stirred under Ar at ambient temperature for 8–10 h. Sodium borohydride (0.57 g, 15 mmol) was then added and the resulting mixture was stirred for an additional 7–8 h at ambient temperature. The reaction was then quenched by pouring into aqueous ammonia (2 mol dm23, 30 cm3), the resulting inorganic precipitate was filtered off, and washed with dichloromethane (50 cm3). The organic layer was separated and the remaining aqueous layer was extracted once with dichloromethane (50 cm3). The combined organic extracts were next extracted once with hydrochloric acid (1 mol dm23, 25 cm3) to separate the neutral materials. The acidic aqueous extracts were washed once with dichloromethane (50 cm3), then treated with aqueous sodium hydroxide (2 mol dm23) to pH 10–12, and extracted with dichloromethane (50 cm3 × 3). The combined organic extracts were washed with brine (50 cm3), dried (Na2CO3) and concentrated in vacuo to afford N-methyl secondary amines in good to excellent yield. |
3樓2013-05-29 23:29:40
2樓2013-05-29 23:10:01
【答案】應(yīng)助回帖
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tosn: 金幣+30, 翻譯EPI+1, ★★★★★最佳答案 2013-05-30 18:00:46
tosn: 金幣+30, 翻譯EPI+1, ★★★★★最佳答案 2013-05-30 18:00:46
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將羰基化合物（10 mmol）、鈦（IV）異丙氧化物（5.9cm3,20 mmol），鹽酸甲胺（1.35g,20 mmol）和三乙胺（2.79cm3,20 mmol）溶于無水乙醇（15cm3）中，氬氣下室溫攪拌8-10h。加入硼氫化鈉（0.57g,15 mmol），將所得混合物室溫下繼續(xù)攪拌7-8h。倒入氨水（2 mol dm-3,30cm3）使反應(yīng)猝熄，濾去所得物中的無機沉淀，用二氯甲烷（50 cm3）洗滌。分離有機層，余下水層用二氯甲烷（50 cm3）提取一次。 接下來，將合并后的有機提取物用鹽酸(1 mol dm-3,25 cm3)提取一次，以分離中性物質(zhì)。 酸性水提取物使用二氯甲烷（50 cm3）洗滌一次，再使用氫氧化鈉溶液(2 mol dm-3）調(diào)節(jié)pH到10-12，用二氯甲烷(50 cm3 × 3)提取。合并的有機提取物用鹽水(50 cm3)洗滌，干燥(Na2CO3)，真空濃縮以得到高產(chǎn)率的N-甲基二胺。 |
4樓2013-05-30 16:41:07
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