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6. Figure 21.13 (page 324) shows the IR spectrum of polystyrene. Which functional groups are present...
6. Figure 21.13 (page 324) shows the IR spectrum of polystyrene. Which functional groups are present in polystyrene? Which bands tell you this information? (give approximate wavenumbers) Transmission IR ATR IR 500 4000 3500 3000 2500 2000 1500 1000 Wavenumbers (cm) FIGURE 21.13 Comparison of (top) a transmission spectrum of polystyrene with (bottom) an ATR spectrum of polystyrene. Strong peak between 1820-1600 cm 1? YES NO Carbonyl Present Look for "companion" peaks broad 3400-2400 cm! (O-H) Carboxylic Acid medium (maybe...
3. Record the characteristic absorption bands for your unknown. my unknown is 2-pentanol Table of Typical...
3. Record the characteristic absorption bands for your
unknown.
my unknown is 2-pentanol
Table of Typical IR Frequencies IR Stretching Frequencies (cm) Mayoran Triple Bonds 2100-2260 alkyne nitrile C-H alkane (sp) 3000-2850 alkene (sp?) 3080-3020 alkyne isp) 3300-3330 aromatic ispa) 3100-3000 aldehyde 2900,2700 O-H alcohol H-Bonded - 3800-3200 (broad) acid - 3000-2500 (broad) Double Bonds alkene C.C. 1680-1620 aromatic C.C 1600-145€ ester C. acid C. 1725-1700 amide CuO 1600-1650 aldehyde cao 1740-1720 ketone C. saturated 1725-1705 a. unsaturated aryt 1686-1665...
6) The IR-, 1H- and 13C-spectra of an unknown sample having the formula C8H1602 are shown...
6) The IR-, 1H- and 13C-spectra of an unknown sample having the formula C8H1602 are shown on the next page. a) What can you conclude about the structure form the 13C NMR data ? b) What functional group is present ? Explain your rational c) Propose a structure that is consistent with the spectroscopic data ? 8 8 3 3 8 3000 innn 500 400 2000 1500 Wavenumber[cm-11 TR2009-87586TK 13C NMR NB: solvent peaks have been edited out. 140 120...
Unknown Number: Molecular Formula: Index of Hydrogen Deficiency: Structure: Mass Spec Molecular Weight: Important Fragments; what...
Unknown Number:
Molecular Formula:
Index of Hydrogen Deficiency:
Structure:
Mass Spec
Molecular Weight:
Important Fragments; what are they and what do they mean? (base
peak structure, is there a halogen, is there a benzene ring, is
there an odd number of nitrogens, other important fragments that
tell something about the structure)
IR
Is there an OH? Wavenumber?
Is there a carbonyl group? If so what type (acid. ester, amide,
aldehyde, ketone etc.)? Wave number?
Other important peaks (terminal alkyne, cyano...
Unknown C313 L00 J000 500 3000 4000 RVENUNER 678 77 629 77 109e 66 77 2971...
Unknown C313 L00 J000 500 3000 4000 RVENUNER 678 77 629 77 109e 66 77 2971 16 20 1461 1415 38 26 1050 2940 2800 26e1 74 41 S3 492 66 24 1384 1341 66 1285 27 55 1044 37 886 44 2668 44 780 57 72 712 4 1235 32 762 1222 26 467 39 Unknown C313 200 180 160 140 120 100 80 60 40 20 ppm 100 Unknown C313 80- 60 40 20 0 tT 10 30...
Unknown C314 t00 D 4000 3000 2000 1500 1000 S00 WAVENUMBERI- 3604 84 2967 77 2925 1546 1257 Б 966 37...
Unknown C314 t00 D 4000 3000 2000 1500 1000 S00 WAVENUMBERI- 3604 84 2967 77 2925 1546 1257 Б 966 37 3352 81 79 1492 1450 81 1161 SB 928 72 3087 3063 64 3040 72 72 2867 1686 1646 64 26 62 13 1160 74 761 15 4 1430 1103 79 731 79 6B 1360 1079 62 691 14 3029 72 3005 68 1599 21 1313 1025 50 82 618 61 1683 41 1303 63 1001 74 688 17...
6. Figure 21.13 (page 324) shows the IR spectrum of polystyrene. Which functional groups are present in polystyrene? Which bands tell you this information? (give approximate wavenumbers) Transmission IR ATR IR 500 4000 3500 3000 2500 2000 1500 1000 Wavenumbers (cm) FIGURE 21.13 Comparison of (top) a transmission spectrum of polystyrene with (bottom) an ATR spectrum of polystyrene. Strong peak between 1820-1600 cm 1? YES NO Carbonyl Present Look for "companion" peaks broad 3400-2400 cm! (O-H) Carboxylic Acid medium (maybe...
3. Record the characteristic absorption bands for your
unknown.
my unknown is 2-pentanol
Table of Typical IR Frequencies IR Stretching Frequencies (cm) Mayoran Triple Bonds 2100-2260 alkyne nitrile C-H alkane (sp) 3000-2850 alkene (sp?) 3080-3020 alkyne isp) 3300-3330 aromatic ispa) 3100-3000 aldehyde 2900,2700 O-H alcohol H-Bonded - 3800-3200 (broad) acid - 3000-2500 (broad) Double Bonds alkene C.C. 1680-1620 aromatic C.C 1600-145€ ester C. acid C. 1725-1700 amide CuO 1600-1650 aldehyde cao 1740-1720 ketone C. saturated 1725-1705 a. unsaturated aryt 1686-1665...
6) The IR-, 1H- and 13C-spectra of an unknown sample having the formula C8H1602 are shown on the next page. a) What can you conclude about the structure form the 13C NMR data ? b) What functional group is present ? Explain your rational c) Propose a structure that is consistent with the spectroscopic data ? 8 8 3 3 8 3000 innn 500 400 2000 1500 Wavenumber[cm-11 TR2009-87586TK 13C NMR NB: solvent peaks have been edited out. 140 120...
Unknown Number:
Molecular Formula:
Index of Hydrogen Deficiency:
Structure:
Mass Spec
Molecular Weight:
Important Fragments; what are they and what do they mean? (base
peak structure, is there a halogen, is there a benzene ring, is
there an odd number of nitrogens, other important fragments that
tell something about the structure)
IR
Is there an OH? Wavenumber?
Is there a carbonyl group? If so what type (acid. ester, amide,
aldehyde, ketone etc.)? Wave number?
Other important peaks (terminal alkyne, cyano...
Unknown C313 L00 J000 500 3000 4000 RVENUNER 678 77 629 77 109e 66 77 2971 16 20 1461 1415 38 26 1050 2940 2800 26e1 74 41 S3 492 66 24 1384 1341 66 1285 27 55 1044 37 886 44 2668 44 780 57 72 712 4 1235 32 762 1222 26 467 39 Unknown C313 200 180 160 140 120 100 80 60 40 20 ppm 100 Unknown C313 80- 60 40 20 0 tT 10 30...
Unknown C314 t00 D 4000 3000 2000 1500 1000 S00 WAVENUMBERI- 3604 84 2967 77 2925 1546 1257 Б 966 37 3352 81 79 1492 1450 81 1161 SB 928 72 3087 3063 64 3040 72 72 2867 1686 1646 64 26 62 13 1160 74 761 15 4 1430 1103 79 731 79 6B 1360 1079 62 691 14 3029 72 3005 68 1599 21 1313 1025 50 82 618 61 1683 41 1303 63 1001 74 688 17...
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