作者:A. Kakehi、K. Kitajima、S. Ito、N. Takusagawa
DOI:10.1107/s0108270194004749
日期:1994.12.15
The pyrazolo[1,5-a]pyridine skeletons of 2-phenylpyrazolo [1 ,5-a]pyridine-3-carbonitrile, C14H9N3 (2a), and S-2-methylthiopyrazolo [1,5-a]pyridin-3-yl p-chlorothiobenzoate, C15H11C1N2OS2 (2b), are planar [maximum deviation 0.019 (3) Angstrom for (2a) and 0.011 (5) Angstrom for (2b)]. The pyrazolo[1,5-a]pyridine skeleton of compound (2b), in which the 2- and 3-substituents are bonded to the pyrazole ring by two long C-S bonds, shows no significant distortion, while in (2a), with the 2-phenyl and the 3-cyano groups, considerable changes are seen in the bond angles resulting from the severe steric interaction accompanied by the resonance effect between the pyrazolo[1,5-a]pyridine and the phenyl group.