Polymerization of an optically active phenylacetylene derivative bearing an azide residue by click reaction and reaction with a rhodium catalyst

2008 ◽  
pp. 3019 ◽  
Author(s):  
Shinzo Kobayashi ◽  
Ken Itomi ◽  
Kazuhide Morino ◽  
Hiroki Iida ◽  
Eiji Yashima
Keyword(s):  
Click Reaction ◽  
Rhodium Catalyst ◽  
Optically Active

Synthesis of Chiral Amphiphilic Graft Copolymer PBTQMO-g-MPEO

2011 ◽  
Vol 308-310 ◽  
pp. 689-691
Author(s):  
Yong Zhou ◽  
Zhi Guo Hu
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Graft Copolymer ◽  
Click Reaction ◽  
Optically Active ◽  
Resonance Spectroscopy ◽  
Amphiphilic Graft Copolymer ◽  
1H Nuclear Magnetic Resonance ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
The Fourier Transform

A new optically active amphiphilic graft copolymer bearing quinine pendants poly[3,3-bis(triazolyl-L-quinine) methyl oxetane]-g-poly(ethylene oxide) (PBTQMO-g-MPEO) was synthesized by ‘‘click’’ reaction of azido-modified PBAMO-g-MPEO diblock copolymer and 10,11-didehydro quinine. The fourier transform infrared spectrum(FTIR) and 1H nuclear magnetic resonance spectroscopy (1HNMR) were used to confirm its structure and composition.

scholarly journals A facile synthesis of cysteine-based diketopiperazine from thiol-protected precursor

2018 ◽  
Vol 5 (6) ◽  
pp. 180272
Author(s):  
Di Zhang ◽  
Wayne Wang
Keyword(s):  
Amino Acid ◽  
Potential Application ◽  
Click Reaction ◽  
Building Blocks ◽  
Optically Active ◽  
Spectroscopic Methods ◽  
Synthetic Route ◽  
Facile Synthesis ◽  
Chiroptical Property ◽  
Potential Applications

l -Cysteine is one of the most promising biomass-based building blocks with great potential applications. Herein, we report a versatile synthetic route to produce cysteine-based 2,5-diketopiperazine (DKP) with good yield from the thiol-ene click reaction of l -cysteine and commercially available acrylates, followed by dimerization of the amino acid intermediates. The achieved DKP diastereomers were successfully separated and fully characterized by spectroscopic methods. Moreover, the chiroptical property of DKP in the presence of various metal ions was investigated by circular dichroism spectroscopy. The potential application of the optically active cysteine-based DKP as a chiral probe for detection of silver ion in water has been demonstrated.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Optical analysis of ink and other contaminants in process waters

TAPPI Journal ◽  
2012 ◽  
Vol 11 (8) ◽  
pp. 51-58
Author(s):  
ANTTI HAAPALA ◽  
MIKA KÖRKKÖ ◽  
ELISA KOIVURANTA ◽  
JOUKO NIINIMÄKI
Keyword(s):  
Optically Active ◽  
Process Water ◽  
Paper Machine ◽  
Optical Analysis ◽  
Direct Process ◽  
Active Components ◽  
Water Contaminants ◽  
Dependent Measurement ◽  
Measurement Methodology

Analysis methods developed specifically to determine the presence of ink and other optically active components in paper machine white waters or other process effluents are not available. It is generally more interest¬ing to quantify the effect of circulation water contaminants on end products. This study compares optical techniques to quantify the dirt in process water by two methods for test media preparation and measurement: direct process water filtration on a membrane foil and low-grammage sheet formation. The results show that ink content values obtained from various analyses cannot be directly compared because of fundamental issues involving test media preparation and the varied methodologies used to formulate the results, which may be based on different sets of assumptions. The use of brightness, luminosity, and reflectance and the role of scattering measurements as a part of ink content analysis are discussed, along with fine materials retention and measurement media selection. The study concludes with practical tips for case-dependent measurement methodology selection.

Microscopic Structure of Er-Related Optically Active Centers in Si

2003 ◽  
Vol 770 ◽  
Author(s):  
H. Przybylinska ◽  
N. Q. Vinh ◽  
B.A. Andreev ◽  
Z. F. Krasil'nik ◽  
T. Gregorkiewicz
Keyword(s):  
Ground State ◽  
Photoluminescence Spectrum ◽  
Zeeman Effect ◽  
Optically Active ◽  
Single Type ◽  
Active Centers ◽  
Mbe Growth ◽  
Spectral Components ◽  
Er Doped ◽  
Successful Observation

AbstractA successful observation and analysis of the Zeeman effect on the near 1.54 μm photoluminescence spectrum in Er-doped crystalline MBE-grown silicon are reported. A clearly resolved splitting of 5 major spectral components was observed in magnetic fields up to 5.5 T. Based on the analysis of the data the symmetry of the dominant optically active center was conclusively established as orthorhombic I (C2v), with g‼≈18.4 and g⊥≈0 in the ground state. The fact that g⊥≈0 explains why EPR detection of Er-related optically active centers in silicon may be difficult. Preferential generation of a single type of an optically active Er-related center in MBE growth confirmed in this study is essential for photonic applications of Si:Er.

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