Assignment of relative and absolute configuration of acyclic polyols and aminopolyols by circular dichroism - trends follow fischer's sugar family tree
摘要:
Reference CD curves (measured in methylcyclohexane) of a homologous series of 1,2-polyols up to pentols derivatized as anthroates at 1-OH and p-methoxycinnamates at the remaining hydroxyl groups show a systematic trend that greatly simplifies assignments of relative and absolute configurations. The same trend also holds for the corresponding 1-aminopolyols, but not for 2-aminopolyols.
Assignment of relative and absolute configuration of acyclic polyols and aminopolyols by circular dichroism - trends follow fischer's sugar family tree
摘要:
Reference CD curves (measured in methylcyclohexane) of a homologous series of 1,2-polyols up to pentols derivatized as anthroates at 1-OH and p-methoxycinnamates at the remaining hydroxyl groups show a systematic trend that greatly simplifies assignments of relative and absolute configurations. The same trend also holds for the corresponding 1-aminopolyols, but not for 2-aminopolyols.
Process for the removal of basic materials from plant products
申请人:Philip Morris Products Inc.
公开号:EP0280817A2
公开(公告)日:1988-09-07
A process is provided for the selective removal of basic materials from plant products, in particular, for removing nicotine from tobacco without materially affecting the content of the other components of the tobacco. Tobacco is. traversed with a solvent in the supercritical state or in the liquid state wherein nicotine and the other components dissolve in the solvent. The solvent is then passed through an acid-containing trap where the solvent is essentially freed of nicotine. The solvent, depleted of nicotine and enriched in the other components, is then recycled to the tobacco to reextract nicotine. In addition, the tobacco may be pretreated with a chemical base which does not substantially react withe the tobacco components under ambient conditions but rather is activated under the conditions of the extraction process. Pretreatment of the tobacco with a chemical base neutralizes nicotine salts and permits the extraction process to be carried out under milder conditions.
Assignment of relative and absolute configuration of acyclic polyols and aminopolyols by circular dichroism - trends follow fischer's sugar family tree
作者:Peng Zhou、Nikolina Berova、William T. Wiesler、Koji Nakanishi
DOI:10.1016/0040-4020(93)80020-t
日期:——
Reference CD curves (measured in methylcyclohexane) of a homologous series of 1,2-polyols up to pentols derivatized as anthroates at 1-OH and p-methoxycinnamates at the remaining hydroxyl groups show a systematic trend that greatly simplifies assignments of relative and absolute configurations. The same trend also holds for the corresponding 1-aminopolyols, but not for 2-aminopolyols.