Multifunctional menomers and polyarylene compsotions therefrom
申请人:Hahnfeld L. Jerry
公开号:US20070037894A1
公开(公告)日:2007-02-15
A compound comprising i) one or more dienophile groups (A-functional groups), ii) one or more ring structures comprising two conjugated carbon-to-carbon double bonds and a leaving group L (B-functional groups), and iii) one or more addition polymerizable, telechelic, or graftable functional groups, excluding groups capable of cycloaddition reactions with acetylenic- or conjugated diene functionality (C′-functional groups), characterized in that the A-functional group of one monomer is capable of reaction under cycloaddition reaction conditions with the B-functional group of a second monomer to thereby form a polymer.
Zinc Enolate/Sulfinate Prepared from a Single-Run Reaction Using Zinc Dust with<i>O</i>-Tosylated 4-Hydroxy Coumarin and Pyrone
作者:Ueon Sang Shin、Seong-Ryu Joo、Seung-Hoi Kim
DOI:10.1002/bkcs.10819
日期:2016.7
Solid-state and solution photocycloadditions of 4-acyloxy-2-pyrones with maleimide
reactions of 4-acyloxy-2-pyrones (1b,c) with maleimide (2) afforded endo–endo double-[4+2] cycloadducts (3b,c) with high stereoselectivity. Sensitized photoreactions of 1a–d with 2 in solution gave exo–endo double-[4+2] cycloadducts (4a–d). 2-Pyrones 1a–d were photolyzed to give carboxylic acids (5a–d) via their valence isomerization in the solidstate and in solution. Such kinds of photoreaction of the 4-acyloxy-2-pyrones