Problemas de espectroscopia RMN, Exercícios de Química Orgânica

Baixe Problemas de espectroscopia RMN e outras Exercícios em PDF para Química Orgânica, somente na Docsity! 1 NMR Practice Problems Spring 2014 2 Fall 2007 1. Compound W has an empirical formula of C10H13NO2. Given are the following spectra. a. Determine the degree of unsaturation for the compound. b. Assign five pertinent peaks in the IR spectrum. c. Suggest a structure for compound W based on the spectra given. Show all your work and clearly indicate what your final answer is. Integration 2 2 2 2 2 3 Multiplet d d t s “m” t 5 DEPT 135 DEPT 90 DEPT 45 # of attached hydrogens 0 1 2 3 DEPT 135 0 up down up DEPT 90 0 up 0 0 DEPT 45 0 up up up Final Answer 6 Spring 2008 3. Compound W has an empirical formula of C11H14O2. Given are the following spectra. a. Determine the degree of unsaturation for the compound. b. Assign the five pertinent peaks in the IR spectrum. c. Suggest a structure for compound W based on the spectra given. Show all your work. Place your final answer in the box provided below. Only a molecule placed is this box will receive credit! Integration 5 2 1 6 7 DEPT 135 DEPT 90 DEPT 45 Note: The signal group at 128 ppm is comprised of two tall and one medium sized signal. # of attached hydrogens 0 1 2 3 DEPT 135 0 up down up DEPT 90 0 up 0 0 DEPT 45 0 up up up Final Answer 10 Fall 2008 5. Compound W has an empirical formula of C10H12O3. Given are the following spectra. Show all your work. a. Determine the degree of unsaturation for the compound. b. Assign the five pertinent peaks in the IR spectrum. c. Suggest a structure for compound W based on the spectra given. Place your final answer in the box provided below. Only a molecule placed is this box will receive credit! Integration 5 1 2 1 3 11 DEPT 135 DEPT 90 DEPT 45 Note: The signal group at 128 ppm is comprised of one tall and one medium sized signal (see DEPT). # of attached hydrogens 0 1 2 3 DEPT 135 0 up down up DEPT 90 0 up 0 0 DEPT 45 0 up up up Final Answer 12 Winter 2009 6. Compound W has an empirical formula of C10H18O4. Given are the following spectra. Show all your work. a. Determine the degree of unsaturation for the compound. b. Assign the four pertinent peaks in the IR spectrum. c. Suggest a structure for compound W based on the spectra given. Place your final answer in the box provided below. Only the molecule placed is this box will receive credit! Integration 4 1 1 6 6 15 DEPT 135 DEPT 90 DEPT 45 # of attached hydrogens 0 1 2 3 DEPT 135 0 up down up DEPT 90 0 up 0 0 DEPT 45 0 up up up Final Answer 16 Fall 2009 8. Compound W has an empirical formula of C11H14O2. Given are the following spectra. Show all your work (= label peaks in the spectra!) a. Determine the degree of unsaturation for the compound. b. Assign the five pertinent peaks in the IR spectrum. c. Suggest a structure for compound W based on the spectra given. Place your final answer in the box provided below. Only the molecule placed is this box will receive credit! Partial structures and structures which do not meet the molecular formula, will not any receive credit. Integration 4 2 2 3 3 Multiplet d/d/t/t 17 DEPT 135 DEPT 90 DEPT 45 # of attached hydrogens 0 1 2 3 DEPT 135 0 up down up DEPT 90 0 up 0 0 DEPT 45 0 up up up Final Answer 20 Spring 2010 10. Compound W has an empirical formula of C10H14O. Given are the following spectra. Show all your work (= label peaks in the spectra!) a. Determine the degree of unsaturation for the compound. b. Assign the five pertinent peaks in the IR spectrum. c. Suggest a structure for compound W based on the spectra given. Place your final answer in the box provided below. Only the molecule placed is this box will receive credit! Partial structures and structures which do not meet the molecular formula, will not any receive credit. Integration 5 2 1 1 2 3 21 DEPT 135 DEPT 90 DEPT 45 # of attached hydrogens 0 1 2 3 DEPT 135 0 up down up DEPT 90 0 up 0 0 DEPT 45 0 up up up Final Answer 22 Answers Fall 2007 Winter 2008 Spring 2008 O O Summer 2008 Fall 2008 O OH O Winter 2009 O O O O Summer 2009 O O O Fall 2009 O O Winter 2010 O O O Spring 2010 OH