Re: [學科] 三題NMR解譜
※ 引述《FTICR (FT-ICR)》之銘言:
: 3.
: C12H12O3
: UV: 215, 248, 310 nm
: IR: 3400-2300, 1709, 1580, 1459 cm-1
: 1H NMR(400MHz): 8.60(br,1H), 8.18(d,2.0,1H), 7.79(d,2.0,1H),
: 3.77(dd,18.6,7.9,1H), 3.02(dd,18.6,3.7,1H),
: 2.72(ddq,7.9,7.0,3.7,1H), 2.45(s,3H), 1.31(d,7.0,3H)
: 13C NMR(100MHz): 16.2q, 20.9q, 36.1t, 42.0d, 127.1s, 129.4d, 137.9s, 138.0d,
: 138.1s, 153.1s, 171.3s, 209.1s
: HMBC: 209.1/1.31,2.72,3.02,3.77,7.79 ; 171.3/8.18 ;
: 153.1/2.72,3.02,3.77,7.79,8.18 ; 20.9/8.18,7.79
: http://ppt.cc/abZS
拋磚引玉一下 單從氫譜來看 我覺得8.60的peak應該對應R-O-COH
8.18和7.79是meta-Ar-H
3.77 3.02 2.72 1.31 這四組訊號從coupling constant來看應該是在一起
形成cyclopropane ring
CH3 <--1.31
│ <--2.72
/\
/__\ <-- 3.77 和3.02
我卡關的地方是不知道3.77和3.02這兩個氫如何能有18.6 Hz的coupling constant
俊毅Bird Man
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※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 165.91.11.26
推
01/13 01:34, , 1F
01/13 01:34, 1F
→
01/13 01:35, , 2F
01/13 01:35, 2F
→
01/13 01:35, , 3F
01/13 01:35, 3F
→
01/13 01:35, , 4F
01/13 01:35, 4F
→
01/13 01:36, , 5F
01/13 01:36, 5F
→
01/13 01:36, , 6F
01/13 01:36, 6F
→
01/13 01:36, , 7F
01/13 01:36, 7F
推
01/13 01:40, , 8F
01/13 01:40, 8F
→
01/13 01:40, , 9F
01/13 01:40, 9F
→
01/13 01:43, , 10F
01/13 01:43, 10F
→
01/13 01:44, , 11F
01/13 01:44, 11F
→
01/13 01:45, , 12F
01/13 01:45, 12F
→
01/13 01:53, , 13F
01/13 01:53, 13F
推
01/13 01:55, , 14F
01/13 01:55, 14F
→
01/13 01:57, , 15F
01/13 01:57, 15F
推
01/13 02:00, , 16F
01/13 02:00, 16F
→
01/13 02:02, , 17F
01/13 02:02, 17F
→
01/13 02:08, , 18F
01/13 02:08, 18F
推
01/13 08:56, , 19F
01/13 08:56, 19F
→
01/13 08:56, , 20F
01/13 08:56, 20F
→
01/13 08:57, , 21F
01/13 08:57, 21F
→
01/13 08:58, , 22F
01/13 08:58, 22F
→
01/13 08:59, , 23F
01/13 08:59, 23F
→
01/13 09:21, , 24F
01/13 09:21, 24F
→
01/13 09:23, , 25F
01/13 09:23, 25F
→
01/13 09:24, , 26F
01/13 09:24, 26F
推
01/14 01:36, , 27F
01/14 01:36, 27F
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