Studies of the optically active compunds of anacardiaceae exudates. Vi. The exudate from Pentaspadon officinalis Holmes

1959 ◽  
Vol 12 (2) ◽  
pp. 234 ◽  
Author(s):  
JA Lamberton
Keyword(s):  
Benzoic Acid ◽  
Optically Active

The oil from the wood of Pentaspadon officinalis Holmes (family Anacardiaceae) consists largely of 2-hydroxy-6-(heptadeca-cis-8',cis,-11'-dieny)benzoic acid. It is very similar to the oil from P. motleyi Hook. f. and does not contain optically active cyclohexenones of the type found in Campnosperma exudates.

Enantioselektive Katalyse, 109 Neue erweiterte chirale Bipyridine/Enantioselective Catalysis, 109 New Expanded Chiral Bipyridines

1997 ◽  
Vol 52 (7) ◽  
pp. 839-846 ◽  
Author(s):  
Henri Brunner ◽  
Ingo Poleschak
Keyword(s):  
Benzoic Acid ◽  
Nucleophilic Substitution ◽  
Optically Active ◽  
Enantioselective Catalysis ◽  
Acid Chlorides ◽  
Nitrogen Ligands

Abstract Optically active two and three layer nitrogen ligands were synthesized by reacting the N-BOC-protected aminoalcohols (1S,2S)-2-amino-1 -phenyl-1,3-propanediol and (S)-2-amino-1,4-butanediol with chloromethyl-benzoic acid chlorides. Expansion was carried out at the chlo-romethyl substituents via nucleophilic substitution with N-methylated (R)-1-phenylethylamine. The deprotected substances were N-benzylated and reacted with 6,6′-bis(bromomethyl)-2,2′-bipyridine to give the new optically active expanded bipyridine ligands.

TEM characterization of proton-exchanged LiNbO3 optical waveguides

1986 ◽  
Vol 44 ◽  
pp. 480-481
Author(s):  
W. E. Lee
Keyword(s):  
Refractive Index ◽  
Benzoic Acid ◽  
Optical Waveguides ◽  
Total Internal Reflection ◽  
Index Of Refraction ◽  
Optical Measurements ◽  
Lithium Ions ◽  
Wide Channel ◽  
Tem Characterization

An optical waveguide consists of a several-micron wide channel with a slightly different index of refraction than the host substrate; light can be trapped in the channel by total internal reflection.Optical waveguides can be formed from single-crystal LiNbO3 using the proton exhange technique. In this technique, polished specimens are masked with polycrystal1ine chromium in such a way as to leave 3-13 μm wide channels. These are held in benzoic acid at 249°C for 5 minutes allowing protons to exchange for lithium ions within the channels causing an increase in the refractive index of the channel and creating the waveguide. Unfortunately, optical measurements often reveal a loss in waveguiding ability up to several weeks after exchange.

Bjerkandera adusta as a source of benzoic acid derivatives targeting 26S proteasome and cathepsins B&L

2019 ◽  
Author(s):  
K Georgousaki ◽  
N Tsafantakis ◽  
S Gumeni ◽  
V González-Menéndez ◽  
G Lambrinidis ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
26S Proteasome ◽  
Bjerkandera Adusta ◽  
Benzoic Acid Derivatives

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.

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