Total Synthesis of (±)-Clavilactones A, B, and Proposed D through Iron-Catalyzed Carbonylation-Peroxidation of Olefin
作者:Leiyang Lv、Baojian Shen、Zhiping Li
DOI:10.1002/anie.201400326
日期:2014.4.14
clavilactones A, B, and the previously proposedD have been synthesized through iron‐catalyzed carbonylation–peroxidation of a 1,5‐diene. Three steps from aldehydes, alkenes, and tert‐butylhydroperoxide build up α,β‐epoxy‐γ‐butyrolactone skeleton as a key building block for synthesis of clavilactone family and its derivatives. Based on our results, the structure of the proposed clavilactone D is not correct
Total Synthesis and Structure Revision of (±)-Clavilactone D Through Selective Cyclization of an α,β-Dicarbonyl Peroxide
作者:Leiyang Lv、Barry B. Snider、Zhiping Li
DOI:10.1021/acs.joc.7b00693
日期:2017.5.19
The structure of (±)-clavilactone D was revised, and the synthesis was achieved in seven steps from a substituted benzaldehyde. The key step was the base-catalyzed cyclization of an α,β-carbonyl peroxide, which was obtained by an iron-catalyzed three-component reaction of a benzaldehyde, an alkene, and TBHP. NaBH4-mediated reductive lactonization of the resulting cis-dicarbonyl epoxide led to the α
Impact modifier for polymethyl methacrylate resin having excellent impact strength and transparency and method of preparing the same
申请人:LG CHEM, LTD.
公开号:EP2530097A1
公开(公告)日:2012-12-05
Disclosed is an impact modifier for polymethyl methacrylate resins comprising a seed formed by polymerizing methyl methacrylate, a rubber core surrounding the seed, wherein the rubber core is formed by polymerizing a monomer mixture comprising alkyl acrylate, an aromatic vinyl compound, a cross-linkable monomer and a polyethylene glycol comonomer, and a shell surrounding the core wherein the shell is formed by polymerizing a mixture comprising methyl methacrylate and at least one compound selected from the group consisting of alkyl acrylate and an aromatic vinyl compound. The impact modifier improves impact strength without causing deterioration in transparency by using the polyethylene glycol comonomer in the process of producing the core.