Search results for "self-condensation"
showing 2 items of 12 documents
A new synthesis of soluble poly(1,4-phenylenevinylene)s and poly(2,5-pyrimidinylenevinylene)s
1991
Abstract Alkoxy-substituted 4-methylbenzylideneanilines 2a-f and their pyrimidine analogues 2g,h show an efficient selfcondensation in the alkaline medium KOC(CH 3 ) 3 /DMF. The totally stereoselective reaction yields 3a-h which are transformed by acidic work-up to 4a-h . A narrow distribution of the molecular weight can be achieved.
Synthesis of 6,12-Disubstituted Methanodibenzo[b,f][1,5]dioxocins : Pyrrolidine Catalyzed Self-Condensation of 2′-Hydroxyacetophenones
2019
The preparation of unprecedented 6,12-disubstituted methanodibenzo[b,f][1,5]dioxocins from pyrrolidine catalyzed self-condensation of 2′-hydroxyacetophenones is herein described. This method provides easy access to this highly bridged complex core, resulting in construction of two C–O and two C–C bonds, a methylene bridge and two quaternary centers in a single step. The intricate methanodibenzo[b,f][1,5]dioxocin compounds were obtained in up to moderate yields after optimization of the reaction conditions concerning solvent, reaction times and the use of additives. Several halide substituted methanodibenzo[b,f][1,5]dioxocins could be prepared from correspondent 2′-hydroxyacetophenones.