Phthalimide-Carried Disulfur Transfer To Synthesize Unsymmetrical Disulfanes via Copper Catalysis

Abstract

A versatile Cu-catalyzed cross-coupling reaction to various unsymmetrical disulfanes has been presented, from phthalimide-carried disulfur transfer reagents and commercially available boronic acids under mild and practical conditions. The method features the unprecedented use of phthalimide-carried disulfurating reagents (Harpp reagent) in cross-coupling chemistry and is highlighted by the broad substrate scopes, even applicable for the transfer of aryldisulfur moieties (ArSS−). Notably, the robustness of this methodology is shown by the late-stage modification of bioactive scaffolds of coumarin, estrone, and captopril.

Effect of template-induced surface species on electronic structure and photocatalytic activity of g-C3N4

“…The enlarged view of (002) diffraction peaks in Supplementary data). All samples show broad peaks assigned to amine groups or 3 water between 2900 and 3600 cm -1 , characteristic stretching modes of CN 4 heterocycles from 1200 to 1600 cm -1 , and a typical breathing mode of the triazine 5 units at ≈810 cm -1 , revealing their similar chemical structures. Besides, as the TEM 6 images show ( Fig.…”

“…After equilibrium adsorption, the suspension was 2 exposed to visible-light irradiation with magnetic stirring. At given time intervals, 3 about 5.0 mL of suspension was continually taken from the reaction cell for 4 subsequent target dye concentration analysis after centrifuging. The degradation 5 efficiencies of MO and RhB were evaluated using a Hitachi U-3010 UV-vis 6 spectrophotometer.…”

“…Graphitic carbon nitride (g-C 3 N 4 ), a well-known metal-free photocatalyst, 3 has been widely employed as visible-light driven catalyst for hydrogen 4 production and pollutants degradation [1][2][3][4]. Compared to metal-based 5 visible-light active photocatalyst, its unique features of low-cost, sustainability, 6 ease of synthesis, appealing optical and electronic properties make g-C 3 N 4 7 particularly attractive as a promising candidate photocatalyst for future 8 applications.…”

“…Among various strategies, 20 morphology tuning by hard template is an efficient way to increase the 21 reactivity of g-C 3 N 4 due to current literature infers that a much higher activity 22 4 of g-C 3 N 4 might be induced through the introduction of slight disorder in the 1 g-C 3 N 4 structure [19,20]. Various templates including silica sphere [21], 2 mesocellular silica foam, SBA-15 [22], anodic alumni oxide membrane [23], 3 and order mesoporous carbon [24] have been employed to tune the morphology 4 of carbon nitrides. These studies mainly focused on the design and development 5 of mesostructured g-C 3 N 4 , aiming to increase the surface area so that the slight 6 disorder could be introduced in the structure of g-C 3 N 4 and thus the 7 photocatalytic activity of the templated carbon nitrides would be enhanced.…”

“…By introducing various templates (SiO 2 , Al 2 O 3 and 21 template-free) in the synthesis of g-C 3 N 4 , several carbon nitrides with different 22 5 surface chemistry were obtained. Carefully characterizations by X-ray 1 photoelectron spectra (XPS), UV-Vis diffuse reflectance spectroscopy, 2 photoluminescence spectra (PL), valence band spectra (VB) and photocatalytic 3 test show that the template has a significant influence on their electronic 4 structure and performance of g-C 3 N 4 , originating from the surface species 5 variation induced by templates. These results provide us a new insight into the 6 influence of template on electronic band structure and its photoactivity 7 performance.…”