9-间甲三基-3,6-双(二甲基氨基)碲氧杂蒽合六氟磷酸盐(1)碲氯丹明在温和的好氧条件下光催化氧化芳香族和脂肪族硅烷以及三苯基膦。在可见光照射下,1可以与自敏化的1 O 2反应生成活性的碲氧化物氧化剂(2)。使用2或1将硅烷氧化为硅烷醇,将三苯基膦氧化为三苯基氧化膦有氧照射。动力学实验与计算研究相结合,阐明了硅烷和磷化氢底物氧化的可能机理。在三苯基膦及甲基二苯基硅烷的氧化观察到一阶速率,表示相同的机构,用于底物结合到所述氧化(碲取代IV)。另外,这些反应表现出对水的速率依赖性。氧化通常在50:50的水/甲醇中进行,但是,不存在水会使硅烷的氧化速率比三苯基膦的氧化程度更大。在溶剂混合物中使用D 2 O的溶剂动力学同位素实验中观察到了平行结果。硅烷的氧化速度在更大程度上减慢了硅烷的氧化速度。2(k H / k D = 17.30)比磷化氢(k H / k D = 6.20)。在使用大气氧作为
This passage is a technical description of a compound that can induce localized hypoxic conditions in vivo, providing a compound that allows for temporal and spatial control of hypoxic conditions. The compound is represented by the formula (1) where X is a group containing a chalcogenolodamine skeleton, Y is a substituted hydrocarbon group, a hydrogen atom, or a carboxyl group, Z is independently a hydrogen atom or a methyl group, and R1 is a substituted hydrocarbon group.
Novel Rhodamine Dyes via Suzuki Coupling of Xanthone Triflates with Arylboroxins
作者:Michael Detty、Brandon Calitree
DOI:10.1055/s-0029-1218535
日期:2010.1
Novel rhodamine dyes were prepared from xanthone precursors in a ‘one-pot’ procedure via reaction of the xanthone with trifluoromethanesulfonic anhydride followed by Pd-mediated Suzuki coupling between the xanthone triflate and an arylboroxin. Rhodamines with 9-(3- or 4-carboxyphenyl) and 9-(3-nitrophenyl) substituents were prepared by this procedure. The procedure also works well with thio- and selenoxanthones, but not with telluroxanthones.
Photocatalytic Aerobic Thiol Oxidation with a Self-Sensitized Tellurorhodamine Chromophore
作者:Luke V. Lutkus、Irving D. Rettig、Kellie S. Davies、Jacqueline E. Hill、James E. Lohman、Mathew W. Eskew、Michael R. Detty、Theresa M. McCormick
DOI:10.1021/acs.organomet.7b00166
日期:2017.7.24
tellurorhodamine. The oxidation to the telluroxide is accompanied by the formation of hydrogen peroxide. The telluroxide oxidizes thiols to regenerate the tellurorhodamine and the disulfide plus water. Mechanistically, DFT suggests adding two thiols to the telluroxide with the loss of H2O to give a trigonal-bipyramidal Te(IV), which undergoes concerted loss of disulfide to regenerate 1. Oxidation of thiophenol
We have designed and synthesized a reversible near-infrared (NIR) fluorescence probe, 2-Me TeR, for reactive oxygen species (ROS), utilizing the redox properties of the tellurium (Te) atom. 2-Me TeR is oxidized to fluorescent 2-Me TeOR by various ROS, while the generated 2-Me TeOR is quickly reduced in the presence of glutathione to regenerate 2-Me TeR. This redox-induced reversible NIR-fluorescence response of 2-Me TeR allowed us to detect the endogenous production of ROS and subsequent homeostatic recovery of the intracellular reductive environment in hydrogen peroxide-stimulated HL-60 cells. This probe is expected to be useful for monitoring the dynamics of ROS production continuously in vivo.
Synthesis, photophysical characterization, and aerobic redox reactivity of electron-rich tellurorhodamine photocatalysts
作者:Irving D. Rettig、Kristine M. Halvorsen、Theresa M. McCormick
DOI:10.1039/d2dt03534k
日期:——
electron donating groups affect photophysical properties and catalyst function. The synthesized complexes 1B, 1C, and 1D contain increasingly electron-donating substituents (Me, t-Butyl, OMe) on the xylene ring. 1A, containing an unsubstituted xylene, was synthesized for use as a control. UV-Vis spectroscopy was used to determine the photophysical properties of the dyes and for kinetic and thermodynamic