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jadekoala850Lv1
13 Jan 2023
IV. 'H NMR Analysis a. H NMR Analysis-Attach your expanded 300MHz 'H NMR. Label the hydrogens a-d on your spectrum. Also, label the CHCl, from the CDCla. Note: a) the integration values found in the NMR are for the WHOLE polymer and the substructure below is for the purposes of identifying the chemical shifts only. For example, the peak at 4.86 ppm is for ALL lactone repeat units in the polymer, not one-half. b) we are assuming two end groups were formed if reaction occurred on both sides of the initiator. integration for 7.34 ppm will be set to 4 5.16 ppm Hc 7.34 ppm 5.10 ppm End group 4.36 ppm H2C OH O. 4.86 ppm H 7.34 ppm 5.16 ppm 144.13/2 x n Hd DDL 170.2 xn 144.13/2 x n DDDL 198.3 x n 138.2 integration area of that proton relative to Hd set to 4 hydrogens b. Propose a reason why the L-lactide methine protons, He, in the polymer are observed downfield from the lactone methine protons, Hb
IV. 'H NMR Analysis a. H NMR Analysis-Attach your expanded 300MHz 'H NMR. Label the hydrogens a-d on your spectrum. Also, label the CHCl, from the CDCla. Note: a) the integration values found in the NMR are for the WHOLE polymer and the substructure below is for the purposes of identifying the chemical shifts only. For example, the peak at 4.86 ppm is for ALL lactone repeat units in the polymer, not one-half. b) we are assuming two end groups were formed if reaction occurred on both sides of the initiator. integration for 7.34 ppm will be set to 4 5.16 ppm Hc 7.34 ppm 5.10 ppm End group 4.36 ppm H2C OH O. 4.86 ppm H 7.34 ppm 5.16 ppm 144.13/2 x n Hd DDL 170.2 xn 144.13/2 x n DDDL 198.3 x n 138.2 integration area of that proton relative to Hd set to 4 hydrogens b. Propose a reason why the L-lactide methine protons, He, in the polymer are observed downfield from the lactone methine protons, Hb
imranshkh84Lv8
14 Jan 2023
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