Synthesis and mesogenic properties of 3,6-disubstituted cyclohex-2-en-1-ones
作者:Roger Brettle、David A. Dunmur、Louise D. Farrand、Charles M. Marson
DOI:10.1039/jm9960600747
日期:——
A series of 3,6-substituted cyclohex-2-en-l-ones have been prepared by an efficient convergent Robinson-type annulation route. The cyclohex-2-en-l-one ring is the basis of a novel mesogenic core and when substituted at the 6-position provides a chiral centre, which is adjacent to a strong transverse dipole moment. This system has the advantage that both of the two main features required for new electro-optical applications (a dipole for switching and a chiral centre to reduce the symmetry) are located in the molecular core. The synthesis and mesogenic properties of these novel enones are reported.
Isolation and Characterization of Two Major Degradation Products of Dyclonine Hydrochloride
作者:Cheng‐Yi Liang、Y. Yang、Mohammad A. Khadim、Gilbert S. Banker、Vijay Kumar
DOI:10.1002/jps.2600840921
日期:1995.9
Dycloninehydrochloride, a local anesthetic, is known to degrade in aqueous media. In this paper, the isolation and characterization of twomajordegradationproducts, formed by heating of an aqueous solution of dycloninehydrochloride for 2 weeks at 50 degrees C, are presented. The proton and carbon-13 nuclear magnetic resonance, infrared, and mass spectral data reported conclusively show the two