scholarly journals Copolymerization of Optically Active Ethyl 2-Methyl-2-ethyl-2-butenoate with Vinyl Acetate

1956 ◽  
Vol 29 (2) ◽  
pp. 287-288 ◽  
Author(s):  
Matsuji Takebayashi ◽  
Yasumasa Ito
Keyword(s):  
Vinyl Acetate ◽  
Optically Active

scholarly journals Chemoenzymatic synthesis and biological evaluation of enantiomerically enriched 1-(β-hydroxypropyl)imidazolium- and triazolium-based ionic liquids

2013 ◽  
Vol 9 ◽  
pp. 516-525 ◽  
Author(s):  
Paweł Borowiecki ◽  
Małgorzata Milner-Krawczyk ◽  
Jan Plenkiewicz
Keyword(s):  
Ionic Liquids ◽  
Vinyl Acetate ◽  
Propylene Oxide ◽  
Ring Opening ◽  
Biological Evaluation ◽  
Optically Active ◽  
Chemoenzymatic Synthesis ◽  
Alkyl Bromides ◽  
Wide Range ◽  
Synthesis And Biological Evaluation

Racemic 1-(β-hydroxypropyl)azoles were prepared by solvent-free direct regioselective ring opening of 1,2-propylene oxide with imidazole or 1,2,4-triazole. Lipase-catalyzed transesterification of alcohols with vinyl acetate resulted in kinetic enantiomers resolution. Separated (S)-enantiomers of (+)-1-(1H-imidazol-1-yl)propan-2-ol and (+)-1-(1H-1,2,4-triazol-1-yl)propan-2-ol were quaternized with alkyl bromides or iodides, yielding novel optically active ionic liquids. Racemic salts were tested against a wide range of microorganisms.

Asymmetric Hydroformylation of Vinyl Acetate:  Application in the Synthesis of Optically Active Isoxazolines and Imidazoles

2007 ◽  
Vol 9 (14) ◽  
pp. 2665-2668 ◽  
Author(s):  
P. J. Thomas ◽  
Alex T. Axtell ◽  
Jerzy Klosin ◽  
Wei Peng ◽  
Cynthia L. Rand ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Optically Active ◽  
Asymmetric Hydroformylation

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.

Inhibition of Radical-Initiated Vinyl Acetate Polymerisation by Tobacco Smoke Fractions

1974 ◽  
Vol 7 (5) ◽  
Author(s):  
M.A. Nisbet ◽  
S. Schmeller
Keyword(s):  
Benzoyl Peroxide ◽  
Vinyl Acetate ◽  
Tobacco Smoke ◽  
Boiling Point ◽  
Water Bath ◽  
Measuring Time ◽  
Time Required

AbstractBoth the vapour and particulate phases of tobacco smoke have been shown to retard benzoyI-peroxide-initiated polymerisation of vinyl acetate by interception of the radicals involved in the polymerisation process. The extent of inhibition of polymerisation by test compounds is estimated by measuring time taken for a mixture of monomer and benzoyl peroxide, immersed in a water-bath at 70°C, to reach a spontaneous boil and comparing it with the time required for a similar mixture with added retarder to reach boiling point. Units are expressed as minutes of inhibition per part per million of inhibitor × 10

COMPARATIVE STUDIES OF ETHYLENE VINYL ACETATE FILMS WITH VARIOUS SILICATE NANOCOMPOSITES

2019 ◽  
Vol 12 (04) ◽  
pp. 1803-1809
Author(s):  
A. Kaviarasi ◽  
M.V.L. Kumari ◽  
A.R. Prabakaran ◽  
A. Anandavadivel
Keyword(s):  
Vinyl Acetate ◽  
Comparative Studies ◽  
Ethylene Vinyl Acetate ◽  
Silicate Nanocomposites
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