Influence of cyclodextrin on the solubility of a classically prepared 2-vinylcyclopropane macromonomer in aqueous solution

• Helmut Ritter,
• Jia Cheng and
• Monir Tabatabai

Beilstein J. Org. Chem. 2012, 8, 1528–1535, doi:10.3762/bjoc.8.173

• . Optical transmittance of aqueous solutions (c = 20 mg/mL) of 3, 6 und 8 during heating. 2D ROESY NMR spectrum of a 5/Me2-β-CD deuterated water solution. Temperature-dependent transparency measurements of aqueous solution of the supramolecular complex 7 (c = 20 mg/mL in water). Mechanism of free radical

Cyclodextrin nanosponge-sensitized enantiodifferentiating photoisomerization of cyclooctene and 1,3-cyclooctadiene

• Wenting Liang,
• Cheng Yang,
• Masaki Nishijima,
• Gaku Fukuhara,
• Tadashi Mori,
• Andrea Mele,
• Franca Castiglione,
• Fabrizio Caldera,
• Francesco Trotta and
• Yoshihisa Inoue

Beilstein J. Org. Chem. 2012, 8, 1305–1311, doi:10.3762/bjoc.8.149

• optical transparency down to the UV region [3][4]. Nevertheless, the foregoing studies on CD-based supramolecular photochirogenesis have focused primarily on the use of native and singly or doubly modified monomeric CDs. In this communication, we report the results of the first supramolecular

Synthesis and characterization of a novel carboxyl group containing (co)polyimide with sulfur in the polymer backbone

• Miroslav Mrsevic,
• David Düsselberg and
• Claudia Staudt

Beilstein J. Org. Chem. 2012, 8, 776–786, doi:10.3762/bjoc.8.88

• copolymers were characterized by using NMR, FTIR, GPC, and DSC. Furthermore, with regard to processing and potential applications, the thermal stability, solubility in common organic solvents, moisture uptake, and transparency were investigated. Compared to commercially available transparent polymers, i.e

• high-performance coating materials. Keywords: DABA; functional (co)polyimides; optical polymers; sulfur-containing polymers; transparency; Introduction Over the past few years, various new applications have drawn the attention of industry to materials with superior mechanical, thermal and chemical

• ) sulfide (4,4′-diaminodiphenyl sulfide, 4,4′-SDA) groups, were used for the synthesis of novel (co)polyimides in this work [25]. In order to investigate structural effects of the DABA groups on the glass-transition temperature, molecular weight, transparency and water sorption, both polymers 6FDA-4,4′-SDA

Imidazole as a parent π-conjugated backbone in charge-transfer chromophores

• Jiří Kulhánek and
• Filip Bureš

Beilstein J. Org. Chem. 2012, 8, 25–49, doi:10.3762/bjoc.8.4

• through a thiazole-styryl π-linker (Figure 4). Whereas the series 5a–c and 7a–c showed promising optical nonlinearities, high thermal stability, excellent solubility, and good transparency, molecules 8a–d were investigated as two-photon absorbing chromophores (Table 2). Bu and co-workers also investigated

• polyphosphazene backbone and subsequently modified by post-azo coupling with variously substituted benzenediazonium salts to afford systems 125–130 (Figure 22; Table 15; [125][126][127]). These systems possess good optical transparency, high Tg, and large d33 (SHG) and photoinduced birefringence values relative

Triple-channel microreactor for biphasic gas–liquid reactions: Photosensitized oxygenations

• Ram Awatar Maurya,
• Chan Pil Park and
• Dong-Pyo Kim

Beilstein J. Org. Chem. 2011, 7, 1158–1163, doi:10.3762/bjoc.7.134

• of fabrication and its optical transparency. Although microfluidic devices made of PDMS suffered from swelling problems caused by nonpolar organic solvents [46], we found that organic reactions can conveniently be performed in polar organic solvents such as DMF, DMSO, acetonitrile, etc., without any

Chiral recognition of macromolecules with cyclodextrins: pH- and thermosensitive copolymers from N-isopropylacrylamide and N-acryloyl-D/L-phenylalanine and their inclusion complexes with cyclodextrins

• Sabrina Gingter,
• Ella Bezdushna and
• Helmut Ritter

Beilstein J. Org. Chem. 2011, 7, 204–209, doi:10.3762/bjoc.7.27

• range of 15 to 70 °C. During continuous stirring, the transparency of the sample was determined by a voltage controlled semiconductor laser and a silicium-photodiode at a wavelength of 500 nm and a heating or cooling rate of 1 °C·min−1. All critical temperatures were detected by determination of the

• temperature where the transparency of the solution was 50% of the initial value. The hydrodynamic diameters of the copolymers were determined by dynamic light scattering (DLS) in backscattering mode on a Malvern Zetasizer Nano ZS ZEN 3600 with a laser wavelength of 633 nm and a detection angle of 173

EcoScale, a semi- quantitative tool to select an organic preparation based on economical and ecological parameters

• Koen Van Aken,
• Lucjan Strekowski and
• Luc Patiny

Beilstein J. Org. Chem. 2006, 2, No. 3, doi:10.1186/1860-5397-2-3

• .). In particular, the lack of transparency of the life cycle analysis, the lack of objectivity in assigning the Q value for a reagent or the unclear definition of "non-benign" for the calculation of effective mass yield, can be noted. To our knowledge, no tool for evaluation of chemical reaction

• conditions on laboratory scale has been developed. Herewith, we propose a unified algorithm, called EcoScale, to help select an acceptable organic preparation. Design of the EcoScale Starting principles A basic requirement for the design of the EcoScale is transparency and user-friendliness. At the same time