title: Dual catalysis with magnetic chitosan: direct synthesis of cyclic carbonates from olefins with carbon dioxide using isobutyraldehyde as the sacrificial reductant.
abstract: Chitosan coated magnetic nanoparticles were synthesized and used as a support for the immobilization of the cobalt(II) acetylacetonate complex [Co(acac)2] and quaternary triphenylphosphonium bromide [P(+)Ph3Br(-)] targeting -NH2 and -OH moieties located on the surface of chitosan. The synthesized material was used as a catalyst for one pot direct synthesis of cyclic carbonates from olefins via an oxidative carboxylation approach with carbon dioxide using isobutyraldehyde as the sacrificial reductant and molecular oxygen as the oxidant. After the reaction, the catalyst was recovered by applying an external magnet and reused for several runs without significant loss in catalytic activity and no leaching was observed during this course.
authors.affiliation: Chemical Sciences Division, CSIR-Indian Institute of Petroleum, Dehradun 248005, India. suman@iip.res.in.
authors.forename: Subodh
authors.initials: S
authors.lastname: Kumar
authors.forename: Nikita
authors.initials: N
authors.lastname: Singhal
authors.forename: Raj K
authors.initials: RK
authors.lastname: Singh
authors.forename: Piyush
authors.initials: P
authors.lastname: Gupta
authors.forename: Raghuvir
authors.initials: R
authors.lastname: Singh
authors.forename: Suman L
authors.initials: SL
authors.lastname: Jain
mesh_terms: D000447:Aldehydes / Q000737:chemistry*; D000475:Alkenes / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D002254:Carbonates / Q000138:chemical synthesis* / Q000737:chemistry; D002384:Catalysis; D048271:Chitosan / Q000737:chemistry*; D003500:Cyclization; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure
chemical_list: D000447:Aldehydes; D000475:Alkenes; D002254:Carbonates; D058185:Magnetite Nanoparticles; D002245:Carbon Dioxide; D048271:Chitosan; C017439:isobutyraldehyde