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Substracting the peaks correponding to 1,4-isomer (Figure 1A) from Figure 1B leaves the spectrum of the 1,2-isomer, which exhibits four kinds of olefinic hydrogens. The nmr spectral data of N-aryl-1,2-dihydropyridines and N-aryl-1,4-dihydropyridines are summarized in Table 1 and 2, respectively.

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houlu666(½ð±Ò+1): 2011-03-01 12:24:18
Substracting the peaks correponding to 1,4-isomer (Figure 1A) from Figure 1B leaves the spectrum of the 1,2-isomer, which exhibits four kinds of olefinic hydrogens. The nmr spectral data of N-aryl-1,2-dihydropyridines and N-aryl-1,4-dihydropyridines are summarized in Table 1 and 2, respectively.
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houlu666(½ð±Ò+3, ·­ÒëEPI+1): ºÜºÃ 2011-03-01 12:24:13
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