Bicyclic molecule

About: Bicyclic molecule is a research topic. Over the lifetime, 29587 publications have been published within this topic receiving 451252 citations. The topic is also known as: bicyclic molecule.

Mono- and Bifunctional Heterogeneous Catalytic Transformation of Terpenes and Terpenoids

Abstract: Selective reactions of terpenes, catalyzed by different heterogeneous systems, are reported. α-pinene and limonene epoxides can be effectively isomerized to carbonyl compounds (selectivity >70%) over silica aluminas that appear to be good alternatives to homogeneous ZnBr2. The different reactivity of geometric isomers can be used to separate them. Unsaturated ketones can be converted through a two-step one-pot reaction in cyclic or bicyclic ethers through a bifunctional process involving a hydrogenation and an acid-catalyzed step. However, the choice of the solvent allows to inhibit the acidic sites, thus obtaining a selective hydrogenation reaction. On the other hand, the acidic reaction alone can be useful for alcohol epimerization and epimer separation. Grafting of Ti in a siliceous matrix gives rise to a material with both redox and acidic properties. Solids obtained in this way are active and selective in the epoxidation of terpenic alcohols but can also promote bifunctional reactions.

4-[(Bicyclic heterocyclyl)-methyl and -hetero]-piperidines

Abstract: 4-[(Bicyclic heterocyclyl)methyl and -hetero]-piperidines having antihistaminic and serotonin-antagonistic properties which compounds are useful agents in the treatment of allergic diseases.

The Preparation of Optically Pure 7-Oxabicyclo[2.2.1]Hept-2-Ene Derivatives - the Cd Spectrum of (+)-(1r)-7-Oxabicyclo[2.2.1]Hept-5-En-2-One

Abstract: Note: Univ lausanne,inst chim organ,ch-1005 lausanne,switzerland. Reference LGSA-ARTICLE-1983-011doi:10.1002/hlca.19830660627 Record created on 2005-11-09, modified on 2017-05-12