 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 2 | 1/1 | 返回列表 |
| 查看: 420 | 回復(fù): 1 | ||
淺草漫漫銀蟲 (小有名氣)
|
[求助]
英文文獻(xiàn)，急求翻譯
|
|
Singh et al. designed an L-proline based chiral catalyst with a gem-diphenyl group at the β-carbon, which is essential for high enantioselectivities . So far, this catalyst has been used in aldol reactions only between an aldehyde and a ketone . To the best of our knowledge, this is the first time when enantioselective aldol reactions between two aliphatic aldehydes with Singh’s catalyst 1 are reported.With Singh’s catalyst, the stereochemistry of aldol products can be explained by their transition state ，which is based on a model supported by DFT calculations . Since aldehyde oxygen forms hydrogen bonds with the NH and OH groups of catalyst 1, the new C-C bond is formed from its Re face . The thermodynamically favorable E-enamine is mainly formed by giving syn-aldol products. |
回復(fù)此樓» 猜你喜歡
306求調(diào)劑
已經(jīng)有5人回復(fù)
-
284求調(diào)劑
已經(jīng)有4人回復(fù)
-
尋找調(diào)劑
已經(jīng)有4人回復(fù)
-
一志愿中南化學(xué)（0703）總分337求調(diào)劑
已經(jīng)有10人回復(fù)
-
324求調(diào)劑
已經(jīng)有6人回復(fù)
-
一志愿 西北大學(xué) ，070300化學(xué)學(xué)碩，總分287，雙非一本，求調(diào)劑。
已經(jīng)有3人回復(fù)
-
289求調(diào)劑
已經(jīng)有7人回復(fù)
-
319求調(diào)劑
已經(jīng)有4人回復(fù)
-
298求調(diào)劑一志愿211
已經(jīng)有3人回復(fù)
-
求調(diào)劑一志愿海大，0703化學(xué)學(xué)碩304分，有大創(chuàng)項(xiàng)目，四級(jí)已過
已經(jīng)有8人回復(fù)
【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
RXMCDM: 金幣+1, 多謝應(yīng)助！ 2014-08-04 19:50:02
淺草漫漫: 金幣+15, ★有幫助 2014-08-04 20:57:53
RXMCDM: 金幣+1, 多謝應(yīng)助！ 2014-08-04 19:50:02
淺草漫漫: 金幣+15, ★有幫助 2014-08-04 20:57:53
| Singh等人設(shè)計(jì)了一個(gè)手性催化劑，該催化劑是在L-脯氨酸的β-碳上加上了一個(gè)二苯基，這對(duì)增強(qiáng)其對(duì)映選擇性是必須的。到目前為止，這個(gè)催化劑僅用于醛和酮的羥醛縮合反應(yīng)。就我們目前所了解到的，這是第一次有報(bào)道，在辛格催化劑-1的催化作用下，兩個(gè)脂肪族醛類發(fā)生了對(duì)映選擇性羥醛縮合反應(yīng)。有了辛格催化劑，羥醛縮合反應(yīng)產(chǎn)物的立體化學(xué)可以通過他們的過渡狀態(tài)來(lái)解釋，這需要基于密度泛函理論計(jì)算模型。由于醛氧形成的氫鍵連接著催化劑-1的NH和OH組，所以新的C-C鍵是在它的反面形成的。熱力學(xué)上的最穩(wěn)定的E-烯胺主要就是由這種羥醛縮合反應(yīng)合成的產(chǎn)物。 |
2樓2014-08-04 19:48:16
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 淺草漫漫 的主題更新
| 2 | 1/1 | 返回列表 |
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 298求調(diào)劑一志愿211 +3 | 上岸6666@ 2026-03-20 | 3/150 |
|
|---|---|---|---|---|
|
[考研] 08工科 320總分 求調(diào)劑 +8 | 梨花珞晚風(fēng) 2026-03-17 | 8/400 |
|
|
|
[基金申請(qǐng)] 山東省面上項(xiàng)目限額評(píng)審 +4 | 石瑞0426 2026-03-19 | 4/200 |
|
|
|
[考研] 297求調(diào)劑 +11 | 戲精丹丹丹 2026-03-17 | 12/600 |
|
|
|
[考研] 0703化學(xué)297求調(diào)劑 +3 | Daisy☆ 2026-03-20 | 3/150 |
|
|
|
[考研] 一志愿重慶大學(xué)085700資源與環(huán)境總分308求調(diào)劑 +7 | 墨墨漠 2026-03-20 | 7/350 |
|
|
|
[考研] 306求調(diào)劑 +4 | chuanzhu川燭 2026-03-18 | 4/200 |
|
|
|
[考研] 296求調(diào)劑 +6 | www_q 2026-03-18 | 10/500 |
|
|
|
[考研] 294求調(diào)劑材料與化工專碩 +15 | 陌の森林 2026-03-18 | 15/750 |
|
|
|
[考研] 288求調(diào)劑 +16 | 于海海海海 2026-03-19 | 16/800 |
|
|
|
[考研] 350求調(diào)劑 +5 | weudhdk 2026-03-19 | 5/250 |
|
|
|
[考研] 一志愿南理工085701環(huán)境302求調(diào)劑院校 +3 | 葵梓衛(wèi)隊(duì) 2026-03-20 | 3/150 |
|
|
|
[考研] 298-一志愿中國(guó)農(nóng)業(yè)大學(xué)-求調(diào)劑 +9 | 手機(jī)用戶 2026-03-17 | 9/450 |
|
|
|
[考研] 生物學(xué)調(diào)劑招人！�。� +3 | 山海天嵐 2026-03-17 | 4/200 |
|
|
|
[考研] 286求調(diào)劑 +6 | lemonzzn 2026-03-16 | 10/500 |
|
|
|
[考研] 0703化學(xué)調(diào)劑 +5 | pupcoco 2026-03-17 | 8/400 |
|
|
|
[考研] 085600材料與化工求調(diào)劑 +6 | 緒幸與子 2026-03-17 | 6/300 |
|
|
|
[考研] 材料考研調(diào)劑 +3 | xwt。 2026-03-19 | 3/150 |
|
|
|
[考研] 材料工程專碩調(diào)劑 +5 | 204818@lcx 2026-03-17 | 6/300 |
|
|
|
[考研] 一志愿南京大學(xué)，080500材料科學(xué)與工程，調(diào)劑 +4 | Jy? 2026-03-16 | 4/200 |
|