Exercício de Química Sintética e Organica Mista (346)

Prévia do material em texto

B-10. How many signals are expected in the 13C NMR spectrum of the following substance?
(a) 5 (b) 6 (c) 8 (d ) 10
B-11. Which one of the following has the greatest number of signals in its 13C NMR spectrum?
(The spectrum is run under conditions in which splitting due to 13C–1H coupling is not 
observed.)
(a) Hexane (c) 1-Hexene (e) 1,5-Hexadiene
(b) 2-Methylpentane (d ) cis-3-Hexene
B-12. Which of the following C9H12 isomers has the fewest signals in its 
13C NMR spectrum?
(a) (b) (c) (d )
B-13. Which of the following compounds would best fit a 13C NMR spectrum having peaks at � 16,
21, 32, 36, 115, and 140 ppm?
B-14. Which of the following compounds would have the fewest peaks in its 13C NMR spectrum?
(a) (b) (c) (d ) (e)
B-15. Which of the compounds in the previous problem would have the most peaks in its 13C NMR
spectrum?
Cl Cl Cl Cl
Br BrClCl
BrCl
Cl
(a)
(b)
(c)
(d)
COCH3
O
COCH3
O
SPECTROSCOPY 341