Singlet Oxygen Photo-Oxygenation in Water/Pluronic F-127 Hydrogels: Increased Reaction Efficiency Coupled with a Switch in Regioselectivity
作者:Axel G. Griesbeck、Johannes Uhlig、Thomas Sottmann、Lhoussaine Belkoura、Reinhard Strey
DOI:10.1002/chem.201202296
日期:2012.12.7
efficient microenvironments for photochemical reactions, as demonstrated for singletoxygen reactions of monoalkenes. Nonpolar substrates are localized in the nanosized polymer compartment, which can be visualized by neutron scattering. The efficiency of 1O2 reactions is strongly increased for tiglate derivatives and the regioselectivity of the ene reaction of trisubstituted alkenes is completely switched
Pluronic F-127水凝胶是光化学反应的高效微环境,正如单烯烃的单线态氧反应所证明的那样。非极性基质位于纳米级聚合物隔室中,可以通过中子散射将其可视化。tiglate衍生物的1 O 2反应效率大大提高,与溶液相相比,三取代烯烃的烯反应的区域选择性完全切换,与沸石内光氧合相比,其区域选择性完全反转。
An entirely solvent-free photooxygenation of olefins under continuous flow conditions
作者:Patrick Bayer、Axel Jacobi von Wangelin
DOI:10.1039/d0gc00436g
日期:——
The choice of solvents is key to the success of this oxyfunctionalization with direct impact on the solubility of substrates, the lifetime of the reactive oxygen species, and the up-scaling of the process. We report an entirely solvent-free continuous-flow photooxygenation that operates at very high substrate/sensitizer ratios and enables high space–time yields.
The present invention provides an ink set including an ink composition and a maintenance liquid, wherein the ink composition includes a pigment, polymer particles having a glass transition temperature (Tg) of 50° C. or higher, and at least one of urea or a urea derivative.
Moderate enantioslectivity has been achieved on two photochemical reactions that involve molecules reacting from spin forbidden excited states. Zeolite is found to be a unique medium in this context. (C) 1997 Elsevier Science Ltd.
KROPF, HAINZ;REICHWALDT, RALF, J. CHEM. RES. (S),(1987) N2, C. 412-413