Efficient and selective deprotection of aryl aldehyde diacetates catalyzed by tin(II) chloride dihydrate

1223-1225A mild,efficient and excellent yield method for the selective deprotection of aryl aldehyde diacetates in the presence of .phenolic acetate and aliphatic aldehyde diacetate using catalytic amounts of tin(II) chloride dihydrate (SnCl2.2H2O) is described

Photochemistry of some 1,4-dihydropyridine derivatives : Part I

219-22

Atomic layered titanium sulfide quantum dots as electrocatalysts for enhanced hydrogen evolution reaction

The overall electrocatalytic activity toward hydrogen evolution reaction for layered transition metal dichalcogenides is governed by their intrinsic activity, the corresponding density of active sites, and the electron transfer resistance. Here, nanoengineering strategies to scale down both the lateral size and thickness of layered 1T-TiS2 powder to quantum dots (QDs) by bath sonication and probing sonication incision are employed. Uniform lateral size of 3-6 nm in the resulting QDs enhances the density of edge sites while the atomic layer thickness (1-2 nm) facilitates the electron transfer from the substrate to the edge sites. The obtained TiS2 QDs exhibit superior hydrogen evolution reaction activity over TiS2 nanosheets and MoS2 QDs prepared by the same method. The turnover frequency of TiS2 QDs with a small loading of 0.7 ng cm(-2) in an optimal deposition on electrode reached approximate to 2.0 s(-1) at an overpotential of -0.2 V versus RHE, several orders of magnitude higher than TiS2 nanosheets (0.01 s(-1)) and MoS2 QDs (0.07 s(-1)).5116Agências de fomento estrangeiras apoiaram essa pesquisa, mais informações acesse artig