IR, HNMR, Mass Spec, CNMR Flashcards
(47 cards)
1
Q
Br mass spec
A
m and m+2 peak same height
2
Q
Cl mass spec
A
m and m+2 1/3 of eachother
3
Q
C-C IR
A
1200
4
Q
C=C IR
A
1660
5
Q
c triple bond c IR
A
<2200
6
Q
isolated C=C IR
A
1640-1680
7
Q
conjugated c=c IR
A
1620-1640
8
Q
aromatic IR
A
1600
9
Q
sp3 c-h ir
A
2800-3000
10
Q
c=c-h ir
A
3000-3100
11
Q
c triple bond c-h
A
3300 sharp
12
Q
oh ir
A
broad, rounded tip, 3300
13
Q
r2nh ir
A
3300 broad with one sharp spike
14
Q
rnh2 ir
A
broad with two sharp spikes
15
Q
ketone c=o ir
A
1710
16
Q
aldehyde c=o ir
A
1725, aldehyde 2700 2800 stretch
17
Q
carboxylic acid ir
A
c=o is 1710 with broad oh
18
Q
conjugated carbonyls ir
A
absorb at lower frequencies (1680)
19
Q
carbonyl amides ir
A
particularly low- 1640 to 1680
20
Q
carboxylic ester ir
A
1735
21
Q
strained cyclic ketones ir
A
highest frequency out of all; 1785
22
Q
c-n, c=n, cn ir
A
1200, 1660, >2200
23
Q
ir sulfure
A
m+2 peak larger than usual (4.2%)
24
Q
alkane hnmr
A
0.9
25
alkane ch2 hnmr
1.3
26
alkane ch hnmr
1.4
27
methyl ketone hnmr
2.1
28
acetylinic hnmr
2.5
29
r-ch2-x hnmr
3-4
30
c=c-h hnmr
5-6
31
allylic h hnmr
1.7
32
ph-h hnmr
7.2
33
ph-ch3 hnmr
2.3
34
aldehyde h hnmr
9-10
35
carboxylic acid hnmr
10-12
36
r-oh hnmr
10-12
37
ar-oh hnmr
4-7
38
r-nh2 hnmr
1.5-4
39
n-h hnmr
3.5
40
o-h hnmr
4.5
41
coupling constants
-trans>cis>free rotation>geminal
ortho>allylic>meta
overall
trans,cis, ortho, free rotation, allylic, geminal=meta
42
oh or nh on hnmr
will not show splitting if impure
43
c=o cnmr
150-200
44
c=c or aromatic c cnmr
100-150
45
cnmr c-o or c triple bond c
50-100
46
alkane cnmr
0-25
47
c-cl or c-br cnmr
25-60
