Conformational analysis and X-ray structure of 1-(2,4-dichlorobenzyl)-1H-indazole-3-carboxylic acid |
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Authors: | F Benetollo A Del Pra F Orsini L Baiocchi |
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Institution: | (1) I.C.T.R.-C.N.R., Corso Stati Uniti 4, 35020 Padova, Italy;(2) Istituto Chimico Farmaceutico e Tossicologico, Università di Milano, Viale Abruzzi 42, 20131 Milano, Italy;(3) Centra di Studio per le Sostanze Organische Naturali, C. N. R., Via Venezian 21, 20188 Milano, Italy;(4) Dipartimento Chimico, Istituto di Ricerca F. Angelini, Viale della Stazione di S. Palomba, 00040 Pomezia, Roma, Italy |
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Abstract: | The results of a X-ray structure determination and of a quantum-chemical Conformational analysis on the title compound are reported. The crystals belong to the triclinic system, space groupP¯1 (after structure determination), with two molecules in the unit cell, whose parameters are:a=11.966(2),b=8.118(2),c=7.693(2)Å, =97.03(2), =92.98(2), =106.15(2)°: observed density (by flotation) 1.49, calculated 1.503 g cm–3. The structure was solved from 1815 diffractometer-measured intensities, withI 2.5 (I) and refined by full-matrix least-squares to a final conventional indexR=0.035 (R
w
=0.043). The most relevant feature of the molecular structure is the orientation of the dichlorophenyl ring with respect to the planar indazole group, the dihedral angle being 83.1(1)°. A very close conformation corresponds to one of the minima calculated by the semiempirical AMI method. |
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