4-isopropyl catechol

Paratertiary Butylphenoland Paratertiary Amylphenol Paratertiary Butylcatechol and 4-Isopropyl Catechol... 

In a comprehensive review, Bleehen et al. (1968) tested the depigmenting capacity of 33 compounds on black guinea pigs and found that 4-isopropyl catechol (4-IPC) was the most potent. 

A cream containing 1% 4-isopropyl-catechol was applied topically to the hyper-pigmented lesions of 29 patients with melasma, freckles or cafe-au-lait spots. The bleaching effect on melasmas was very satisfactory in all patients, but contact dermatitis developed in 3 patients and a reticular hyperpigmentation with areas of depigmented spots could be noted in one case. Freckles and cafe-au-lait spots did not bleach (14 ). 

METHOD 4 [115]-80% phenol in aqueous H2SO4 soiution of pH 3 is brought to 50 C. 30% H2O2 is then added causing an exothermic reaction and a temperature of 15 C over 3-4 minutes time. 6% aqueous H2SO3 is added after 4.5 minutes, the solution quickly cooled and extracted with isopropyl acetone (Strike would think that another solvent like methyl ethyl ketone could be used) to give 60% catechol. 

Fig (25) Catechol (201) on oxidation with silver oxide generates 3-isopropyl-o-benzoquinone (199) which undergoes ultrasound-promoted cycloaddition with 6,6-dimethyl-1 -vinylcyclohexene (200) yielding the synthesis of miltirone (197). 

Similar TS-1 films have been applied for phenol hydroxyl-ation reaction to dihydroxybenzenes (hydroquinone and catechol) [354] and catalytic oxidation of styrene to benzaldehyde and phenylacetaldehyde [355] with hydrogen peroxide as oxidant in batch-type membrane reactors. The dihydroxybenzenes and phenylacetaldehyde selectivity values increased with in-framework Ti content. In order to reduce the TS-1 membrane costs, Chen et al. [356] have successMly synthesized TS-1 on mullite tubes by replacing TPAOH with TPABr/EtjNH system (4% of the initial cost). The catalytic activity was tested in the probe reaction of isopropyl alcohol oxidation with hydrogen peroxide under pervaporation condition at 60°C. In general, future work on TS-1 film catalysts is required to improve mass transfer resistances and reaction conversion without compromising selectivity. 

Camphorquinone, 77 Carbazole reaction, 9 Carbinol, o-aminophenyl methyl, 55 benzyl isopropyl, 54 phenyl ethyl, 54 phenyl methyl, 44, 54 phenyl ra-propyl, 54 Carone, 75 Carveol, dihydro-, 73 Carvone, 71, 72 Catechol, 39, 42 4-chloro-, 42... 

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