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9 Cards in this Set

  • Front
  • Back
Which band would be expected in the IR spectrum of an ester?
a) 1600
b) 1670
c) 1740
d) 2200
e) 3500
c) 1740
What two things RAISE c=o freq's in IR spectrums?
-placement in a ring system: 6 membered ring or 5 membered ring (~1725)
-bond to O (ester) (~1735)
What two things LOWER c=o stretching freq's?
-conjugation, seperated double bonds by singe bond (~1680)
-bond to a N (amide) (~1650)
What does IR spectroscopy cause molecules to do?
to vibrate
Why use IR spectroscopy?
used to find out what TYPES OF BONDS exist in a molecule
What are the three IR freq's to know?
O-H 3500
C-H 3000
C=O 1700
Sp2 vs Sp3 C-H bonds, what are they're IR freq's?
Sp2: higher than 3000
Sp3: lower than 3000
Alkynes show up at what IR freq?
Why only terminal alkynes show signal?
IR absorbance for any bond is proportional to the polarity of the bond. O=C=O is non-polar.