It is a well known fact curcumin; a coloring principle in turmeric has emerged as the most exploited phyto-constituents for its wide spectrum of biological activities. Mostly, it is available in the market as a mixture of three different constituents, commonly known as curcuminoids. These curcuminoids constitute majorly 75% curcumin (curcumin I), followed by 20% desmethoxycurcumin (curcumin II)...

The yeast Trichosporon mucoides, grown on either glucose or phenol, was able to transform biphenyl into a variety of mono-, di-, and trihydroxylated derivatives hydroxylated on one or both aromatic rings. While some of these products accumulated in the supernatant as dead end products, the ortho-substituted dihydroxylated biphenyls were substrates for further oxidation and ring fission. These r...

Ring-cleaving dioxygenases catalyze key reactions in the aerobic microbial degradation of aromatic compounds. Many pathways converge to catecholic intermediates, which are subject to ortho or meta cleavage by intradiol or extradiol dioxygenases, respectively. However, a number of degradation pathways proceed via noncatecholic hydroxy-substituted aromatic carboxylic acids like gentisate, salicyl...

Hydroxycinnamic acids (HCAs) are important phytochemicals possessing significant biological properties. Several investigators have studied in vitro antioxidant activity of HCAs in detail. In this review, we have gathered the studies focused on the structure-activity relationships (SARs) of these compounds that have used medicinal chemistry to generate more potent antioxidant molecules. Most of ...

Biotransformation of 1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane (DDT) by Alcaligenes eutrophus A5 was demonstrated by analysis of ethyl acetate-extracted products from resting cell cultures. Gas chromatography-mass spectrometry characterization of the neutral extracts revealed two hydroxy-DDT intermediates (m/z = 370) with retention times at 19.55 and 19.80 min that shared identical mass spe...

A new methodology for the pH-triggered degradation of polymers or release drugs under visible light irradiation based on cyclization ortho-hydroxy-cinnamates (oHC) to coumarins is described. The key oHC structural motif can be readily incorporated into rational design novel photocleavable via click chemistry. This main-chain moiety undergoes a fast photocleavage when irradiated with 455 nm prov...

The dehydrogenative coupling of aromatic amides with dimethyl itaconate proceeds smoothly under rhodium catalysis through ortho C−H bond cleavage directed by their amide group to produce benzylidenesuccinates. Aromatic carboxylic acids including benzoic and phthalic also couple the give 1 : 2 products predominantly. Benzylidenesuccinic acid derivatives have been known show various biological ac...

Monosilicon analogs of phenolates and phenylthiolates are studied by quantum chemical calculations. Three different silaphenolates and three different silaphenylthiolates are possible; the ortho-, meta-, and para-isomers. For the silaphenolates, the meta-isomer is the thermodynamically most stable, regardless if the substituent R at Si is H, t-Bu or SiMe(3). However, with R = H and SiMe(3) the ...

A new series of 2-(ortho & para substituted phenoxy)1-(3-(3-chloro-4-methoxyphenyl)-5-(substituted phenyl)-4,5dihydropyrazol-1-yl)ethanone were synthesized. Ortho and para substituted phenol was refluxed with ethylchloroacetate in dry acetone in presence of anhydrous potassium carbonate to yield ethyl (ortho & para substituted phenoxy) acetate (1). The substituted ester on reaction with hydrazi...