Easily accessible dihydropyrans undergo oxidation with PDC/t-BuOOH to yield the corresponding 5,6-dihydro-2-(2H)-pyranones in good yield. The methodology is exemplified with the synthesis of α-pyrone, (±)-argentilactone and (±)-goniothalamin.
Ether monomers and polymers having multi-ring structures, and photosensitive polymers and resist compositions obtained from the same
申请人:Samsung Electronics Co., Ltd.
公开号:US20020160303A1
公开(公告)日:2002-10-31
Provided are alkenyl ether-based monomers having multi-ring structure, and photosensitive polymers and resist compositions obtained from the same. The photosensitive polymer includes a monomer unit represented by the following formula:
1
wherein R
4
and R
5
are independently -H or -CH
3
, and R
4
are independently -H, -OH or a alkyl group having 1-20 carbon atoms.