please answer all questions completely 1. For each compound given below, fill ou

Question

please answer all questions completely

1. For each compound given below, fill out the table to tell the number of regular 13C NMR peaks, the number of peaks in the DEPT-90 spectrum, and the number of peaks in the DEPT-135 spectrum (both positive and negative). [4pts each # 12 pts] ?? Number of regularc NMR peaks Number of DEPT-90Number of positive Number of negative peaks DEPT-135 peaks 0 Number of regularCNumber of DEPT-90Number of positive NMR peakspeaksDEPT-135 peaks Number of negative DEPT-135 peaks 0 Number of regularCNumber of DEPT-90Number of positive peaks Number of negative NMR peaks DEPT-135 peaks

Explanation / Answer

I can give you the theoretical interpretation. 45 ,90 and 135 are the variable flip angles of a last pulse applying on 1H in DEPT sequence, which can convert antiphase magnetization to observable magnetization. So, the intensity of the signal depends on the magnitude of the flip angle and the number of proton attached to a carbon. Formula is I= n sin? cos^(n-1)?.If you put n=1 for 90 , intensity will be a positive number, otherwise it's 0, so only for CH you will get spectrum in positive side, In case of 45 you will get positive signal for n=1,2,3, so all in phase peak you'll get, but for 135 Intensity will be positive only when n=1&3, it will be negetive when n=2, Peaks with the opposite phase are CH2s

1

No. of regular

13C peaks

compound no

No. of regular

13C peaks

no. of DEPT- 90 peaks No. of positive DEPT 135 peaks No. of negative DEPT- 135 peaks 1 7 3 5 2 2 7 2 4 2 3 9 3 4 3

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