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Practice_Quiz_9

Practice_Quiz_9 - Chemistry 322aL Practice Quiz 9(1 Answer...

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Chemistry 322aL Practice Quiz 9 (1) Answer the questions below. 16 8 O (I = 0) 15 7 7 3 12 6 N (I = 1/2) Li (I = 3/2) C (I = 0) (A) Which of the nuclei below are "active" in nmr spectroscopy? CH 4 CH 3 Cl CH 3 Br CH 3 F (B) Which compound below will display a proton resonance most upfield? (C) Which protons in the compound below will display a resonance most downfield? ClCH 2 CH 2 OCH 2 OCH 3 A B C D CH 3 CHOCH 2 CH 3 CH 3 CH 3 CH 2 COCCH 3 O = CH 3 CH 3 C=C H H CH 3 CH 3 CH 2 (D) How many different proton resonances (signals) would appear in the 1 H NMR spectrum of each compound below? Ignore spin-spin interactions . (E) How many different resonances (signals) would appear in the 13 C NMR spectrum of each compound above? Ignore spin-spin interactions . 4 4 3 5 5 5
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(2) Provide structures for the following compounds based on the 1 H NMR spectra data. (A) C 5 H 12 O singlet ! 1.2 (9H) singlet ! 3.2 (3H) (B) C 4 H 10 O triplet ! 0.9 (6H) quartet ! 3.75 (4H) (C) C 5 H 10 O triplet ! 1.25 (6H) quartet ! 2.5 (4H) (D) C 5 H 10 O doublet ! 1.1 (6H) singlet ! 2.2 (3H) septet ! 2.75 (1H) CH 3 OC(CH 3 ) 3 CH 3 CH 2 OCH 2 CH 3 CH 3 CH 2 CCH 2 CH 3 O CH 3 CCH(CH 3 ) 2 O
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