35363-49-6Relevant articles and documents
Thermal/Photo Conversion of Silver 4-Nitrobenzoate to Nitro/Amine- Terminated Silver Nanoparticles
Seo, Yeoung Uk,Lee, Seung Joon,Kim, Kwan
, p. 4000 - 4007 (2004)
We have investigated the thermal and photochemical characteristics of silver 4-nitrobenzoate (Ag-4NBA) using various analytical tools, such as, X-ray diffraction (XRD), diffuse reflectance infrared Fourier transform spectroscopy, Raman spectroscopy, thermogravimetric analysis, scanning electron microscopy, and transmission electron microscopy. The XRD pattern was composed of a series of peaks that could be indexed to (0k0) reflections of a layered structure. Upon heating the sample, structural changes took place particularly at two specific temperatures. The binding state of the carboxylate group changed from bridging to unidentate at ~380 K. A second dramatic structural change occurred at ~590 K, producing 4NBA-capped Ag nanoparticles. The latter transition temperature for Ag-4NBA is about 80 K higher than that for silver alkanecarboxylates, and such enhanced thermal stability of Ag-4NBA must be associated with the conjugation of the carboxylate group to the aromatic ring. On the other hand, Ag-4NBA was readily subjected to photolysis even by visible radiation. Under irradiation by a He/Ne laser at 632.8 nm, 4-NBA-capped Ag nanoparticles were produced from Ag-4NBA. Upon irradiation by an Ar+ laser at 514.5 nm, nitro-to-amine group conversion took place consecutively, finally producing 4-aminobenzoate-capped Ag nanoparticles. Accordingly, the Raman spectrum of Ag-4NBA taken using the 514.5-nm line as the excitation source became identical to the surface-enhanced Raman scattering (SERS) spectrum of 4-NBA adsorbed on Ag.
Direct Carbohydroxylation of Arylalkenes with Allylic Alcohols: Cooperative Catalysis of Copper, Silver, and a Br?nsted Acid
Ahmed, Waqar,Zhang, Sheng,Yu, Xiaoqiang,Feng, Xiujuan,Yamamoto, Yoshinori,Bao, Ming
, p. 2495 - 2499 (2019/02/01)
The cooperative catalysis of copper, silver, and Br?nsted acid is presented as a new strategy for olefin functionalization. The catalytic direct carbohydroxylation of arylalkenes with allylic alcohols provided a straightforward and efficient approach for preparing 4,5-unsaturated alcohols. Synthetically useful functional groups, such as Cl, Br, carbonyl, and chloromethyl, remained intact during the functionalization reaction.
ORGANIC COMPOUNDS
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Page/Page column 45; 47; 48, (2014/02/16)
This invention relates to sphingoglycolipid analogues, compositions comprising these compounds, processes for preparing the compounds, and methods of treating or preventing diseases or conditions using the compounds, such as diseases or conditions relating to infection, atopic disorders, autoimmune disease, diabetes or cancer.
Enantioselective Iron-catalyzed azidation of β-keto esters and oxindoles
Deng, Qing-Hai,Bleith, Tim,Wadepohl, Hubert,Gade, Lutz H.
supporting information, p. 5356 - 5359 (2013/05/21)
The first example of Fe-catalyzed enantioselective azidations of β-keto esters and oxindoles using a readily available N3- transfer reagent is reported. A number of α-azido-β-keto esters were obtained with up to 93% ee, and this methodology also generates 3-substitued 3-azidooxindoles with high enantioselectivities (up to 94%).