C-Arylation reactions catalyzed by CuO-nanoparticles under ligand free conditions

• Mazaahir Kidwai,
• Saurav Bhardwaj and
• Roona Poddar

Beilstein J. Org. Chem. 2010, 6, No. 35, doi:10.3762/bjoc.6.35

• differences which have been shown in the TEM image. The number of reactive sites on the surface is small in the case of larger crystallites and considerably greater in the case of smaller crystallites (Figure 1). To investigate further the surface morphology of CuO-nanoparticles, powder XRD and TEM images

• of the reaction mixture and washed thoroughly with ethyl acetate. The resulting nanoparticles could be reused for several cycles without any significant loss of activity. In our study, we used same nanoparticles three times and the results are summarized below (Table 5). The TEM and XRD analysis of

• NMR). Powder X-ray diffraction pattern and TEM image of nano CuO (fresh). Proposed reaction pathway for the CuO-nanoparticles catalyzed C–C coupling reaction. Powder X-ray diffraction pattern and TEM image of recycled CuO-nanoparticles. Synthesis of 3-phenylpentane-2,4-dione using CuO-nanoparticles

Symmetrical and unsymmetrical α,ω-nucleobase amide-conjugated systems

• Sławomir Boncel,
• Maciej Mączka,
• Krzysztof K. K. Koziol,
• Radosław Motyka and
• Krzysztof Z. Walczak

Beilstein J. Org. Chem. 2010, 6, No. 34, doi:10.3762/bjoc.6.34

• and 5′-amino-2′,5′-dideoxythymidine. The title compounds may find application as antiprotozoal agents. Moreover, preliminary microscopy TEM studies of supramolecular behaviour showed that target molecules with bolaamphiphilic structures were capable of forming highly ordered assemblies, mainly

• synthesis of unsymmetrical derivatives. Interestingly, considering the physicochemical aspect of our work, two of the compounds synthesised containing aliphatic long-chain linkages revealed a tendency to self-assemble in the initial TEM studies. Results and Discussion The subunits containing carboxylic

• the two model compounds 11 and 12. The supramolecular behaviour of conjugated nucleobase-based bolaamphiphiles was examined by TEM. A JEOL 200 FX, operating at 200 kV, was used to obtain the typical images as shown in Figure 4. For the microscopic studies, saturated ethanolic solutions of 11 and 12

Polyionic polymers – heterogeneous media for metal nanoparticles as catalyst in Suzuki–Miyaura and Heck–Mizoroki reactions under flow conditions

• Klaas Mennecke and
• Andreas Kirschning

Beilstein J. Org. Chem. 2009, 5, No. 21, doi:10.3762/bjoc.5.21

• removing traces of soluble Pd species. Top: Reactor (1–2 mL dead volume) with functionalized Raschig-rings; bottom: TEM-micrographs of Pd(0) nanoparticles on optimized polyionic gel (left and central) and Raschig-rings (right). Repeated Suzuki reaction of 4-bromotoluene (6) with phenylboronic acid (10