Tunable Phosphine-Triggered Cascade Reactions of MBH Derivatives and 3-Acyl-2<i>H</i>-chromen-2-ones: Highly Selective Synthesis of Diverse Chromenones
作者:Wei Yuan、Hu-Fei Zheng、Zhi-Hua Yu、Zi-Long Tang、De-Qing Shi
DOI:10.1002/ejoc.201301358
日期:2014.1
Diversechromenones were synthesized through tunable phosphine-mediated cascadereactions between 3-acyl-2H-chromen-2-ones and Morita–Baylis–Hillman (MBH) derivatives. With different phosphine loadings and reaction temperatures, MBHderivatives act either as C1 or C3 synthons for the construction of potential biologically active 3-dihydrofuran-fused chromen-2-ones, 4-allyl-3-acyl-chromen-2-ones, or
Iron-catalyzed direct radical acylation of coumarins with aromatic aldehydes to regioselectively afford 3-aroyl coumarin derivatives in moderate yields was described.
Provided are sealant compositions that include a first component and second component. The first component contains a polysulfide, a polythioether, or a copolymer or combination thereof containing pendant or terminal thiol groups, while the second in component contains an ethylenically-unsaturated compound and either the first or second component further contains a photoinitiator. Alternatively, the second component can contain a polyepoxide and either the first or second component can contain a photolatent base and a photosensitizer. The first or second component further contains a colorant that substantially reflects or substantially transmits light over the wavelength range from 350 nm to 500 nm. These compositions can provide cure-on-demand sealant formulations that comply with Class B sealant regulations on color, provide an acceptable depth of cure, and allow two-part mixing to be easily distinguishable.
所提供的密封剂组合物包括第一组分和第二组分。第一组分含有聚硫化物、聚硫醚或含有悬挂或末端硫醇基团的共聚物或其组合,而第二组分含有乙烯不饱和化合物,第一或第二组分还含有光引发剂。或者,第二组份可以含有聚环氧化物,第一或第二组份可以含有光柔性碱和光敏剂。第一或第二组份还含有一种着色剂,可在 350 纳米到 500 纳米的波长范围内基本反射或基本透过光。这些组合物可提供按需固化的密封剂配方,符合 B 级密封剂对颜色的规定,提供可接受的固化深度,并使双组分混合易于区分。
Composition including a polythiol, a polyepoxide, a photolatent base, and an amine and methods relating to the composition
申请人:3M INNOVATIVE PROPERTIES COMPANY
公开号:US11090681B2
公开(公告)日:2021-08-17
A composition including a polythiol having more than one thiol groups, a polyepoxide having more than one epoxide group, a photolatent base catalyst that can photochemically generate a first amine, and a second amine phase-separated within the composition. A polymer network preparable from the composition, and a method for making the polymer network are also disclosed.
A Regioselective Metal-Free Construction of 3-Aroyl Coumarins by Csp2-H Functionalization
作者:Farnaz Jafarpour、Masoumeh Abbasnia
DOI:10.1021/acs.joc.6b02051
日期:2016.12.2
A successive metal-free TBHP-mediated regioselective C-H functionalization of coumarins toward expedient synthesis of 3-aroyl coumarins is unveiled. The ongoing method conducted through the reaction of either coumarins or coumarin-3-carboxylic acids with aromatic aldehydes. The optimized reaction condition also worked well with benzyl alcohols and styrenes as surrogates for aldehydes, which bear latent carbonyl functionality.