Side Chain Polymers Containing 4 - (5-Alkylated 2-Thienylcarbonyloxy) Benzoic Acid

1990 ◽  
Vol 193 (1) ◽  
pp. 167-170
Author(s):  
G. Kossmehl ◽  
C. Pithart
Keyword(s):  
Benzoic Acid ◽  
Side Chain

THE IONIZATION CONSTANTS OF p-NITROPHENYLACETIC AND PHENYLMALONIC ACIDS

1933 ◽  
Vol 8 (5) ◽  
pp. 447-449 ◽  
Author(s):  
Steward Basterfield ◽  
James W. Tomecko
Keyword(s):  
Benzoic Acid ◽  
Nitro Group ◽  
Malonic Acid ◽  
Phenylacetic Acid ◽  
Ionization Constants ◽  
Side Chain ◽  
Cooh Group ◽  
Conductivity Data ◽  
Nitrobenzoic Acid ◽  
Phenylmalonic Acid

The ionization constants of p-nitrophenylacetic and phenylmalonic acids have been determined from conductivity data. The value of K for p-nitrophenylacetic acid at 25 °C. is 1.04 × 10−4, about twice that of phenylacetic acid. The nitro group in the nucleus has not as powerful an effect on the ionization when the COOH group is in the side chain as it has when both nitro group and COOH are in the nucleus. K for p-nitrobenzoic acid is six times as great as K for benzoic acid. K for phenylmalonic acid is 2. 77 × 10−3 as compared with 1.6 × 10−3 for malonic acid.

Biosynthese von p-Hydroxybenzoesäure und anderer Benzoesäuren in höheren Pflanzen

1964 ◽  
Vol 19 (5) ◽  
pp. 398-405 ◽  
Author(s):  
M. H. Zenk ◽  
G. Müller
Keyword(s):  
Benzoic Acid ◽  
Protocatechuic Acid ◽  
Higher Plants ◽  
Side Chain ◽  
Hydroxybenzoic Acid ◽  
Benzoic Acids ◽  
Coumaric Acid ◽  
Cinnamic Acids ◽  
Feeding Experiments ◽  
Catalpa Ovata

Feeding experiments with glucose- (2-14C), phenylalanine- (3-14C), tyrosine- (3-14C) and p-coumaric acid- (3-14C) showed that the latter three substances are incorporated in good yields into p-hydroxybenzoic acid in leaves of Catalpa ovata. Kinetic experiments showed that p-hydroxybenzoic acid is formed from phenylalanine via p-coumaric acid and the subsequent β-oxidation of the side chain. p-Hydroxybenzoic acid can also be synthetised by hydroxylation of benzoic acid, but this does not seem to be the biosynthetic route in Catalpa.Phenylalanine- (3-14C) is also incorporated into benzoic acid, protocatechuic acid, and vanillic acid by different plants; the radioactivity of the β-C atom of the amino acid was found in each case to be located in the carboxyl group of the C6 — C1 acid. This suggests that in higher plants the benzoic acids are formed from the corresponding cinnamic acids via β-oxidation.

scholarly journals Biodegradation ofn-Alkylcycloalkanes and n-Alkylbenzenes via New Pathways in Alcanivorax sp. Strain MBIC 4326

2001 ◽  
Vol 67 (4) ◽  
pp. 1970-1974 ◽  
Author(s):  
Tapan K. Dutta ◽  
Shigeaki Harayama
Keyword(s):  
Carboxylic Acid ◽  
Benzoic Acid ◽  
Side Chain ◽  
Alkyl Side Chain ◽  
Cyclohexanecarboxylic Acid ◽  
Long Chain

ABSTRACT The degradation of long-chain n-alkylbenzenes andn-alkylcyclohexanes by Alcanivorax sp. strain MBIC 4326 was investigated. The alkyl side chain of these compounds was mainly processed by β-oxidation. In the degradation ofn-alkylcyclohexanes, cyclohexanecarboxylic acid was formed as an intermediate. This compound was further transformed to benzoic acid via 1-cyclohexene-1-carboxylic acid.

A complex of poly(4-vinylpyridine) and tolane based hemi-phasmid benzoic acid: towards luminescent supramolecular side-chain liquid crystalline polymers

2014 ◽  
Vol 50 (61) ◽  
pp. 8378-8381 ◽  
Author(s):  
Shao-Jie Wang ◽  
Rui-Ying Zhao ◽  
Shuang Yang ◽  
Zhen-Qiang Yu ◽  
Er-Qiang Chen
Keyword(s):  
Benzoic Acid ◽  
Liquid Crystalline ◽  
Luminescent Properties ◽  
Liquid Crystalline Polymers ◽  
Side Chain ◽  
Supramolecular Polymer ◽  
Crystalline Polymers ◽  
Phase Structures

A luminescent supramolecular polymer based on P4VP and a tolane based hemi-phasmid benzoic acid forms Sm and Colh phases at different compositions and the luminescent properties depend on the phase structures.

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.

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