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Chapter – 4 Studies on different types of reactions…..
2. One most deshielded proton of pyrazole ring gave singlet in the down
field at 8.24 δ ppm.
3. Rests of the peaks are due to the aromatic protons of two phenyl rings
substituted in pyrazole ring and one phenyl ring fused to the pyran ring.
1 H NMR spectral interpretation of 4-[3-(3-nitrophenyl)-1-phenyl-1H-
pyrazol-4-yl]-3, 4-dihydro-2H-chromeno [4, 3-d] pyrimidine-2, 5(1H)-dione
(DNJ-1603)
1. Two most deshielded protons of secondary amine groups of pyrimidine
ring gave singlet at 9.71 δ ppm and 9.97 δ ppm for C7 and C5
respectively.
2. One deshielded proton of pyrazole ring gave singlet in the down field at
8.24 δ ppm.
3. One shielded proton of pyrimidine ring (C8) gave singlet at 6.53 δ ppm.
4. Rests of the peaks are due to the aromatic protons of two phenyl rings
substituted in pyrazole ring and one phenyl ring fused to the pyran ring.
1 H NMR spectral interpretation of 4-[3-(3-nitrophenyl)-1-phenyl-1H-
pyrazol-4-yl]-2-thioxo-1,2,3,4-tetrahydro-5H-chromeno [4, 3-d] pyrimidin-
5-one (DNJ-1703)
1. Two most deshielded protons of secondary amine groups of pyrimidine
ring gave singlet at 9.79 δ ppm and 10.00 δ ppm for C7 and C5
respectively.
2. One deshielded proton of pyrazole ring gave singlet in the down field at
8.24 δ ppm.
3. One shielded proton of pyrimidine ring (C8) gave singlet at 6.53 δ ppm.
4. Rests of the peaks are due to the aromatic protons of two phenyl rings
substituted in pyrazole ring and one phenyl ring fused to the pyran ring.
Department of Chemistry, Saurashtra University, Rajkot – 360 005 244