Compound No.

R

Chemical shift (δ, ppm)

% Yield

5a

Pyrazolo[1,5-a]pyrimidine

7.97

90

5b

N,N-Dimethylaminopyrimidine

7.67

93

5c

Methyl benzoate

7.68

89

5d

(E)-Prop-1-en-1-ylbenzene

7.70

91

5e

4-Methoxybenzene

7.76

94

5f

4-Nitrobenzene

8.13

92