Ein einfaches Verfahren zur Herstellung anellierter Thiophene
作者:Christian R. Noe、Max Knollm�ller、Ernst Wagner
DOI:10.1007/bf00817900
日期:1986.5
Noe, Christian R., Chemische Berichte, 1982, vol. 115, # 4, p. 1576 - 1590
作者:Noe, Christian R.
DOI:——
日期:——
(+)-Camphoracetic acid: catemeric hydrogen bonding in a γ-keto acid
作者:Hugh W. Thompson、Marie L. Coté、Roger A. Lalancette
DOI:10.1107/s010827010401947x
日期:2004.10.15
The title compound, (1R)- 4,7,7-trimethyl-3-oxobicyclo[2.2.1]heptane- 2-endo-acetic acid, C12H18O3, like its lower homolog, forms carboxyl-to-ketone hydrogen-bonding catemers (Z' = 2) [O ... O = 2.729 (5) and 2.707 (5) Angstrom, and O - H...O = 165 and 170degrees] with screw-related components. The two molecules of the asymmetric unit differ slightly in conformation and produce two counter-aligned hydrogen-bonding chains, both aligned with the b axis. Close intermolecular C - H ... O=C contacts exist for the ketone group of one molecule and for both the ketone and carboxyl functions in the other.
NOE, C. R., CHEM. BER., 1982, 115, N 4, 1576-1590
作者:NOE, C. R.
DOI:——
日期:——
NOE, CH. R.;KNOLLMUELLER, M.;WAGNER, E., MONATSH. CHEM., 1986, 117, N 5, 621-629