Question

I’m supposed to label each peak with the correct letter but I’m struggling to understand it. I’m not sure if I’m doing these correctly. I don’t know how to do the 13C NMR.

Problem K: CHCIO IR: shows stretch at 1740 cm -ester MS: parent ions at 136 and 138; base peak at 101; abundant peaks at 91 and 93 'H NMR 3 H 2 H 2H 2 H PPM PC NMR 180 160 140 120 100 PPM 80 60 40 20

Answer 1

Cs Hq (10₂1. ОВЕ : с IN + + += 6-4.5.0.5 OBE = C+1 - - + = 5+- = 1 IR: 1740 cm – Ester on kelone 'H-NMR : 3H triplet (CH3-CH₂-) 2H kripleta (-CH2 - CH2-) 2H triplet - - - - 2H quartet (-CH₂ - CH₂) Proposed structure : ce-CH₂-CH2-C-0-CH₂-CH3 2H & 21 Ht 2HW in 13 C-NMR All C-atoms will give different signals (5. signal)