Synthesis, spectral characterization, electron microscopic study and thermogravimetric analysis of a phosphorus containing dendrimer with diphenylsilanediol as core unit

• E. Dadapeer,
• B. Hari Babu,
• C. Suresh Reddy and
• Naga Raju Charmarthi

Beilstein J. Org. Chem. 2010, 6, 726–731, doi:10.3762/bjoc.6.85

• groups. The structures of the intermediate compounds were confirmed by IR, GCMS and 31P NMR. The final compound was characterized by 1H, 13C, 31P NMR, MALDI-TOF MS and CHN analysis. Scanning electron microscopic and thermogravimetric analysis/differential scanning calorimetric studies were also performed

Calix[4]arene-click-cyclodextrin and supramolecular structures with watersoluble NIPAAM-copolymers bearing adamantyl units: “Rings on ring on chain”

• Bernd Garska,
• Monir Tabatabai and
• Helmut Ritter

Beilstein J. Org. Chem. 2010, 6, 784–788, doi:10.3762/bjoc.6.83

• NMR spectrum of the successful cycloaddition of 2 and 3 indicates that the di-substituted calix[4]arene 4 was the major product along with a little amount of the mono-substituted compound. In addition, the MALDI-TOF-MS clearly confirmed the existence of the covalently combined rings (4) with a

• desorption ionization time of flight mass spectrometry (MALDI-TOF-MS) was performed on a Bruker Ultraflex TOF mass spectrometer. Ions formed with a pulsed nitrogen laser (25 Hz, 337 nm) were accelerated to 25 kV, the molecular masses being recorded in linear mode. 2-(4-Hydroxyphenylazo)benzoic eacid (HABA

Synthesis of 6-PEtN-α-D-GalpNAc-(1–>6)-β-D-Galp-(1–>4)-β-D-GlcpNAc-(1–>3)-β-D-Galp-(1–>4)-β-D-Glcp, a Haemophilus influenzae lipopolysacharide structure, and biotin and protein conjugates thereof

• Andreas Sundgren,
• Martina Lahmann and
• Stefan Oscarson

Beilstein J. Org. Chem. 2010, 6, 704–708, doi:10.3762/bjoc.6.80

• of 23, from which the Boc-group was removed by acid hydrolysis to afford derivative 24. Protein conjugations were performed by reaction of 24 (20 equiv) with human serum albumin (HSA). Compound 20 was similarly activated with dimethyl squarate and conjugated to HSA. MALDI-TOF MS of the HSA-conjugates

The efficient synthesis of dibenzo[d,d′]benzo[1,2-b:4,3-b′]dithiophene and cyclopenta[1,2-b:4,3-b′]bis(benzo[d]thiophen)-6-one

• Zhihua Wang,
• Sheng Zhu,
• Jianwu Shi and
• Hua Wang

Beilstein J. Org. Chem. 2009, 5, No. 55, doi:10.3762/bjoc.5.55

• , 123.5. HRMS (TOF MS EI+) m/z: calcd for [C18H10O2S2] 322.0122, found 322.0126. IR (KBr): 2928, 2823 (C–H), 1668 (C=O) cm−1. Synthesis of dibenzo[d,d′]benzo[1,2-b:4,3-b′]dithiophene (1) TiCl4 (0.16 mL, 1.5 mmol, 3.0 equiv) was carefully added to dry THF (20 mL) at 0 °C, after keeping at 0 °C for 10 min

• , 137.3, 135.2, 131.2, 126.3, 125.0, 123.5, 123.1, 121.1. HRMS (TOF MS EI+) m/z: calcd for [C18H10S2] 290.0224, found 290.0226. IR: 3054, 2922, 2852 (C–H) cm−1. Synthesis of cyclopenta[1,2-b:4,3-b′]bis(benzo[d]thiophen)-6-one (2) To a solution of 3 (0.1556 g, 0.58 mmol) in anhydrous Et2O (40 mL), n-BuLi

• ); 1H NMR (400 MHz, CDCl3): δ 8.23 (d, J = 8.0 Hz, 2H), 7.84 (d, J = 8.0 Hz, 2H), 7.51 (td, J = 7.6, 1.2 Hz, 2H), 7.40 (td, J = 7.6, 1.2 Hz, 2H). HRMS (TOF MS EI+) m/z: calcd for [C17H8OS2] 290.0017, found 290.0020. IR (KBr): 3053, 2927 (C–H), 1709 (C=O) cm−1. Crystal data for 1 M = 290.38, C18H10S2

N-acylation of ethanolamine using lipase: a chemoselective catalyst

• Mazaahir Kidwai,
• Roona Poddar and
• Poonam Mothsra

Beilstein J. Org. Chem. 2009, 5, No. 10, doi:10.3762/bjoc.5.10

• Analyzer. EI mass spectra were recorded on TOF MS mass spectrometer. Melting points were taken on a Thomas-Hoover melting point apparatus and are uncorrected. The purity of compounds were checked on silica gel coated aluminum plates (Merck TLC: mass particle size 10–12 μm; particle distribution 5–20 μm

New diarylmethanofullerene derivatives and their properties for organic thin- film solar cells

• Daisuke Sukeguchi,
• Surya Prakash Singh,
• Mamidi Ramesh Reddy,
• Hideyuki Yoshiyama,
• Rakesh A. Afre,
• Yasuhiko Hayashi,
• Hiroki Inukai,
• Tetsuo Soga,
• Shuichi Nakamura,
• Norio Shibata and
• Takeshi Toru

Beilstein J. Org. Chem. 2009, 5, No. 7, doi:10.3762/bjoc.5.7

• ; FT-IR (KBr, cm−1): 2923, 2853, 1725, 1608, 1511, 1464, 1430, 1275, 1186, 1136, 1107; MALDI-TOF MS: m/z 1200; Anal. calcd. for C91H44O4: C; 90.98, H; 3.69. Found: C; 89.41, H; 3.45. Photovoltaic cells After rubbing with cloth to remove the protrusions, the ITO-glass (FINE brand, Furuuchi Co. Ltd., 15

Dimerization of propargyl and homopropargyl 6-azido- 6-deoxy- glycosides upon 1,3-dipolar cycloaddition

• Nikolas Pietrzik,
• Daniel Schmollinger and
• Thomas Ziegler

Beilstein J. Org. Chem. 2008, 4, No. 30, doi:10.3762/bjoc.4.30

• product of dimerization though. Only oligomers 8 were observed in this case (for details see Supporting Information File 1). At first, it was unclear whether 7a was formed by an intramolecular cyclization or a dimerization of 4a since its concentration-dependent ESI-MS and MALDI-TOF-MS spectra both showed