Optical article made of amorphous thermoplastic polyester resin
申请人:MITSUBISHI RAYON CO., LTD.
公开号:EP0302516A2
公开(公告)日:1989-02-08
An optical article such as optical disk and optical lens, made of an amorphous thermoplastic polyester resin comprised of recurring units, each recurring unit having an aromatic ring in the main chain thereof and an aromatic ring in the side chain thereof. The optical article have a good heat resistance, resistance to absorption of moisture and optical characteristics.
Synthesis of substituted cyclopropanes from 1,3-diols through the corresponding cyclic sulfates
作者:David Guijarro、Miguel Yus
DOI:10.1016/0040-4020(95)00708-g
日期:1995.10
The reaction of different cyclicsulfates 2 (easily prepared from the corresponding 1,3-diols 1 following the Sharpless methodology) with an excess of lithium powder and a catalytic amount of DTBB (5 mol %) leads to the corresponding substituted cyclopropanes 3 through a γ-elimination process, the sulfate ion acting as leaving group.