para-hydroxybenzoic acid

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para-hydroxybenzoic acid

[¦par·ə hī¦dräk·sē·ben′zō·ik ′as·əd]
(organic chemistry)
C6H4(OH)COOH·2H2O Colorless crystals melting at 210°C; soluble in alcohol, water, and ether; used as a chemical intermediate and for synthetic drugs.
References in periodicals archive ?
1] of each caffeic acid (CA), syringic acid (SA) and 4-hydroxybenzoic acid (4-HBA) were prepared by incorporating the respective phenolic acids into Potato Dextrose Agar (PDA), with the phenolic acids being first dissolved in acetone:water (50:50; v/v) before incorporated into the medium.
Caffeic acid and 4-hydroxybenzoic acid required a higher concentration (up to 2.
guar gum powder (Ases Chemical Works, Jodhpur, India), epichlorohydrin (Aldrich, USA), 4-hydroxybenzoic acid (LOBA Chemic Pvt.
Preparation of 4-Hydroxybenzoic Acid Derivative of Guar Gum.
Improving laccase-facilitated grafting of 4-hydroxybenzoic acid to high-kappa kraft pulps.
Antithyroid effect of a food or drug preservative: 4-hydroxybenzoic acid methyl ester.
In this study, we report the findings on the effect of three phenolic acids; caffeic acids (CA), syringic acid (SA) and 4-hydroxybenzoic acid (4-HBA) in suppressing the Ganoderma invasion within the infected oil palm trees and their surrounding soil in estate.
Monomer Structure Chemical Name [] Hydroquinone (HQ) [] 4,4'-dihydroxybiphenyl (BP) [] Terephthalic acid (TA) [] 2,6-naphthalenedicarboxylic acid (NDA) [] 4-hydroxybenzoic acid (HBA) [[]REPRESENTS CHEMICAL STRUCTURES OF THE MONOMERS ] Table 2.
Vectra, a copolyester based on 4-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid, can under some circumstances crystallize/recrystallize both in the solid state and in the nematic melt, a behavior that profoundly affects the mobility of the chains and thereby the relaxation times (18-24).
An injection molding PE grade has been blended with a semirigid LCP (SBH), synthesized from sebacic acid (S), 4,4[prime]-dihydroxybiphenyl (B), and 4-hydroxybenzoic acid (H), as described before (21-25), and the effect of the addition of the PE-g-SBH copolymers, or that of a commercial MA-grafted PE sample, has been investigated by morphological, rheological and mechanical characterizations.
Wholly aromatic LCPs, such as Vectra-A, a copolyester of 4-hydroxybenzoic acid (H), and 2-hydroxy-6-naphthoic acid (N) produced by Hoechst Celanese have been shown to display no miscibility and poor compatibility with PET [2-12].