24小时热门版块排行榜     意得辑英文润色,师兄用过都说好

查看: 50  |  回复: 1
本帖产生 1 个 翻译EPI ,点击这里进行查看

594306435

银虫 (小有名气)


[交流] 帮忙翻译一段话

用亚磷酸三乙酯代替三苯基膦所制得的磷Ylide与醛酮反应称为Wittig-Horner反应。该反应有两个优点:一是它容易和醛酮反应,有些有三苯基膦制备的磷叶立德,特别是当α碳上带有羰基时,比较稳定,不容易和酮带有,有时需加入苯甲酸作为催化剂。二是反应中的另一产物,O,O-二乙基磷酸钠溶于水,无需像三苯基膦的叶立德时,还需要分离三苯氧膦。三是磷酸酯的反应,立体选择性很强,产物主要是反式。

» 猜你喜欢

» 抢金币啦!回帖就可以得到:

查看全部散金贴

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

slz146

木虫 (正式写手)


594306435(金币+15, 翻译EPI+1): 谢谢 2011-04-16 18:58:17
Triethyl phosphate which was instead of Triphenylphosphine was prepared for P-ylide .  Wittig-Horner reaction was Defined as the reaction of Keto-Aldehyde and above P-ylide . This reaction had two advantages: The first was that it could react with Keto-Aldehyde easily , some P-ylide which was prepared by Triphenylphosphine , especially as there was carbonyl on α-Cedrene , it was Relatively stable and it could not be with ketone easily , sometimes it might  be needed benzoic acid as catalyst . The second was that Another product of the reaction: O, O - diethyl sodium was soluble in water , Triphenylphosphine oxide did not need to be separated when P-ylide was prepared by Triphenylphosphine . The third was that the reaction of phosphoric ester had very strong stereoselectivity , and the product of the reaction was mainly antiform .
2楼2011-04-16 13:13:50
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 594306435 的主题更新
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[职场人生] 书呆子同学 (金币+2) +17 evacuation 2018-10-21 20/1000 2018-10-22 15:48 by huagongfeihu
[硕博家园] 关于找对象 +81 小拇指 2018-10-15 154/7700 2018-10-22 15:40 by yaoyun3120
[硕博家园] 翻译软件,翻译文献一页2块,贵不贵 +5 傲雪雄鹰 2018-10-22 6/300 2018-10-22 14:24 by h123153183
[论文投稿] 投稿 5+3 774007168 2018-10-21 8/400 2018-10-22 10:13 by 774007168
[化工设备] 长三角地区哪里有测试扫描电镜和能谱分析比较专业的第三方机构或学校,求推荐 +5 gufeng2003 2018-10-18 5/250 2018-10-22 01:16 by 多啦A梦2833
[硕博家园] 父母对于你们买房投资是什么态度呢 +47 luokereng 2018-10-17 54/2700 2018-10-22 00:09 by l英雄泪l
[硕博家园] 一定要得到什么成就才敢找对象,我是不是很怯懦 +16 zhanghc8213 2018-10-21 17/850 2018-10-21 23:23 by maiyatang666
[找工作] 东方雨虹 +6 songmimi99 2018-10-18 12/600 2018-10-21 22:30 by BWLHDRH
[考研] 考研有必要报班吗? +12 wish007 2018-10-20 12/600 2018-10-21 15:24 by 三四更雪
[考研] 2020考研 +13 WEZHION 2018-10-19 25/1250 2018-10-21 11:33 by Sunshine0327
[考博] 老师推荐的 靠谱不 +8 爱7号的me 2018-10-19 18/900 2018-10-20 19:31 by 沙漠之狐9230
[考博] 求助,博导推荐。 +5 喵喵琉璃苣 2018-10-19 10/500 2018-10-20 07:42 by 18739942505
[硕博家园] 周五晚上,可以熬会夜,哈哈 +6 怡慕 2018-10-19 6/300 2018-10-20 04:11 by z01z02
[教师之家] 事实上,我也是经过大风大浪的人 +35 windrider_mm 2018-10-17 61/3050 2018-10-19 15:34 by 嗨你咬我啊
[论文投稿] 这个图怎么做?斯皮尔曼分析 +4 camel9044 2018-10-19 4/200 2018-10-19 10:44 by 小飞象cy
[硕博家园] 博一压力大 +28 这样下去 2018-10-17 54/2700 2018-10-19 10:36 by jack56_2013
[论文投稿] 论文被拒但是编辑建议我转投他刊,该如何写cover leter 5+3 谢绝香尘 2018-10-18 9/450 2018-10-18 22:06 by paperhunter
[考博] 土壤学考博 +4 会飞的鸵鸟。 2018-10-17 6/300 2018-10-17 20:39 by 会飞的鸵鸟。
[硕博家园] 想去西藏高校工作一年,一般硕士可以过去吗 +6 第三个 2018-10-16 8/400 2018-10-17 11:12 by 第三个
[找工作] 电化学小硕offer选择 +3 cbj2014 2018-10-15 4/200 2018-10-15 22:32 by 踏学寻梅
信息提示
请填处理意见