13 C-NMR spectroscopy can be used to differentiate between the reactant and the
ID: 1075845 • Letter: 1
Question
13C-NMR spectroscopy can be used to differentiate between the reactant and the product in the reaction based on changes in the environments of different types of carbons. Give the identity of one type of carbon signal and how it could be used to determine whether or not the conversion took place. Include the typical chemical shift and the actual chemical shift for this type of carbon in your statement. Be sure to include correct units. USE ONLY TYPICAL FREQUENCY RANGES FROM THE SPECTRAL CORRELATION TABLE PROVIDED IN APPENDIX I.
CA | Typical Typical (ppm) Actual C# Actual (ppm) (ppm) 17.67 (ppm) n 10-40 10-40 40-80 20-60 110-150 110-150 22.34 145.95 109.81 0.98 415-55 10-40 14.68 10-40 13.79
Explanation / Answer
This is a elemination reaction of alcohal which provides alkene
*13CNMR spectrum show peaks for corbons in different environment . If the corbon atom attached through double bond the it have peak in NMR in between 80-150
*If corbon atom attach to electronegative atom such asO,N,Cl etc then peak appears less than 60ppm
*If reactant(alcohol) is converted to the product(alkene) then in NMR spectrum peaks near 80-150 appears
*In this question the peak of 1b and 2 is appears at 145 and 109 so that are the corbons which have significant peak with which we can differentiate reactant converted product .
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