Lecture8MS - LECTURE 8 Mon Oct 12, 2009 Chapter 14 Quiz No...

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LECTURE 8 Mon Oct 12, 2009 Chapter 14
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Quiz No 1 WEDNESDAY AT 12:00 SHARP (ends 12:15 PM) Basic IR theory Know how to use Table 12.4 and 12.5 Identify O-H, N-H, C-H (alkane, alkene, alkyne), C-C (alkyne, alkene), C=O and C-O stretching frequencies Match spectra with structures NMR: learn basic terms, shielding, upfield, downfield, coupling NMR: 13 C and 1H Match spectra with structures Know how to use Table 13.8 Identify homotopic, enantiotopic and diastereotopic signals No MS material in the quiz
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QUIZ RULES 1) KEEP YOUR QUIZ FACE DOWN UNTIL ADVISED TO START 2) YOU HAVE 15 MIN TO FINISH. YOU MUST WORK ON YOUR OWN 3) IF YOU FINISH EARLY, PLEASE WAIT SILENTLY IN YOUR SIT. 4) AFTER 15 MIN YOU WILL BE GIVEN A NOTICE TO PASS YOUR QUIZ TO THE AISLE. QUIZZES WILL BE PICKED UP EXACTLY AFTER 20 SECONDS. WE WILL NOT COLLECT LATE QUIZZES.
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Last Class OMe OH Me a Me b enantiotopic ! (normally one signal) OMe OH Me Me H a H b diastereotopic ! (two signals) OMe OH Me Me H a H b OMe OH Me Me F H b OMe OH Me Me H a F enantiomers OMe OH Me Me OMe OH Me Me F H b H a F diastereomers (cis-trans) OMe OH F Me b OMe OH Me a F enantiomers enantiotopic ! (normally one signal)
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Enantiotopic ( Normally one signal. Two in homochiral solvent** ) Homotopic (one signal) F H Me Me H H H H Enantiotopic ( Normally one signal. Two in homochiral solvent** ) F X Me H H H H F Me X H H H H New chiral center F Me Me D H H H F Me Me H D H H New chiral center F H Me Me H H D H F H Me Me H H H D No new chiral center **Each will be a spin-spin coupled multiplet
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Homotopic (one signal) Diasterotopic (two signals, ALWAYS**) F H Me Cl H H D H F H Me Cl H H H D No new chiral center F H Me Cl D H H H F H Me Cl H D H H New chiral center F H Me Cl H H H H **Each will be a spin-spin coupled multiplet
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Mass Spectrometry Ch. 14 • The mass spectrometer • The mass spectrum (parent ion, fragment ions and base peak) • Sensitivity • Low resolution and high resolution MS • Isotope clusters, M + +1 and M + +2, etc. • Interpreting MS
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A gas chromatograph- mass spectrometer M a M b M c M a + M b + M c + H 3 C CH 3 HC CH 3
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H H H H H H H H H H H H H H H H H H .
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Lecture8MS - LECTURE 8 Mon Oct 12, 2009 Chapter 14 Quiz No...

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