Complete resolution of cis-1-benzyl-3-methyl-1-phenylphospholanium iodide. Use of the optically active salt in stereochemical studies

1975 ◽  
Vol 40 (12) ◽  
pp. 1843-1844 ◽  
Author(s):  
Kenneth L. Marsi ◽  
Hendrik Tuinstra
Keyword(s):  
Complete Resolution ◽  
Optically Active ◽  
Active Salt

Transition metal mediated asymmetric synthesis. II. Complete resolution of (2R,5S)-(-)-Tricarbonyl[1-5-η-(2-methoxy-5-methylcyclohexadienyl)]iron(1+) hexafluorophosphate(1 -) by selective crystallization of enantiomers

1981 ◽  
Vol 34 (11) ◽  
pp. 2339 ◽  
Author(s):  
GR Stephenson
Keyword(s):  
Absolute Configuration ◽  
Complete Resolution ◽  
Optical Purity ◽  
Rotatory Power ◽  
Optically Active ◽  
Dimethyl Malonate ◽  
Chiroptical Properties ◽  
Selective Crystallization ◽  
Active Salt ◽  
Limiting Value

The resolution of tricarbonyl(1-5-η-cylcohexadienyl)iron(1+) salts can be achieved by selective crystallization of enantiomers. The magnitude of the specific rotatory power of the title salt (1) was increased to a limiting value which was shown to correspond to optical purity, by a direct, n.m.r. method, after alkylation with dimethyl malonate. Reduction of the optically active salt defined the absolute configuration of (2R,5S)-(+ )-tricarbonyl[l-4-η-(2-methoxy-5β-methylcyclohexa-1,3-diene)]-iron(0). The chiroptical properties of the products are discussed.

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.

Chalk-Ex: Transport of Optically Active Particles from the Surface Mixed Layer

2005 ◽  
Author(s):  
Albert J. Plueddemann
Keyword(s):  
Mixed Layer ◽  
Optically Active ◽  
Surface Mixed Layer ◽  
Active Particles
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