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.