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北京石油化工学院2026年研究生招生接收调剂公告
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aileenshan

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[求助] 求助一个化合物的旋光度或者旋光度的正负号 已有2人参与

ACS号为  537-46-2   名称: Benzeneethanamine
最好有旋光度的数值,找不到可以是方向,外加溶解的溶剂
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【答案】应助回帖

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感谢参与,应助指数 +1
aileenshan(星海慧儿代发): 金币+3, 有帮助,多谢回帖交流。 2014-03-11 10:26:20
aileenshan: 金币+4 2014-03-12 18:01:38
Optical Rotation: [a]D25 +14 to +20°
青春无悔
2楼2014-03-10 20:37:35
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yi_wang

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roye

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【答案】应助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
aileenshan(星海慧儿代发): 金币+3, 有帮助,多谢回帖交流。 2014-03-11 10:26:27
aileenshan: 金币+10 2014-03-12 18:01:34
The configuration of title compds. was detd. by the method of asym. transformation.  Following MeCH(NHR)​(CH2)​nPh (I) (R = H) were prepd. by the method of Wallach and Leuckart (n and b.p.​/mm. given)​: 0, 78-​80°​/13; 1, 103°​/13; 2, 110-​15°​/14; and 3, 123-​5°​/19.  The following I (R = CHO) were prepd. by formylation of I (R = H) (n and b.p.​/mm. given)​: 0, 125-​30°​/0.3; 1, 155-​7°​/3; 2, 145-​50°​/3; and 4, - (m. 65-​6°)​.  The redn. of I (R = CHO) with LiAlH4 gave the following I (R = Me) (n and b.p.​/mm. given)​: 0, 80°​/12; 1, 48-​52°​/15; 2, 80°​/1; 3, 122-​4°​/10; and 4, 135-​7°​/18.  I (R = Me, n = 0-​4) (7.5 millimoles) in 5 ml. tetrahydrofuran were treated with 5 millimoles (S)​(+)​-​hydratropic acid ([α]​D 86.6°) and 5 millimoles dicyclohexylcarbodiimide.  The following unreacted optically active I were removed by distn.: (S)​(-​​-​I (R = Me, n = 0)​, [α]​D -​3.5°; (S)​(+)​-​I (R = Me, n = 1)​, [α]​D 0.12°; (S)​(-​​-​I (R = Me, n = 2)​, [α]​D -​0.36°; (S)​(-​​-​I (R = Me, n = 3)​, [α]​D -​0.2°; and (S)​(-​​-​I (R = Me, n = 4)​, [α]​D -​0.16°.  (R)​(+)​-​I (R = H, n = 2)​, [α]​D 3.12°, was converted into (R)​(-​​-​I (R = Ac, n = 2)​, m. 55°, [α]​D -​7.12° (c 0.9, EtOH)​, which upon ozonolysis, H2O2 oxidn., sapon. and benzoylation, gave (R)​(+)​-​N-​benzoyl-​γ-​aminovaleric acid, [α]​D 3.33° (c 0.6, H2O)​, whose abs. configuration was detd. by Balenovic and Cerar.  (+)​-​I (R = H) and (+)​-​I (R = Me) belong to the same steric series as shown by O.R.D. studies.  The O.R.D. curve of S-​(-​​-​I (R = H, n = 0) showed a pos. Cotton effect at 250-​70 mμ superimposed on a strong neg. background curve.  (S)​(+)​-​I (R = H, n = 1) showed the same pos. Cotton effect on an anomalous pos. background.  The O.R.D. curves of (S)​(-​​-​I (R = H, n = 2-​4) were monotone.
CA查到的结果是+0.12 °        Wavlen: 589.3 nm。
哥泡的不是论坛,是寂寞....
3楼2014-03-11 09:20:27
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