7191-39-1Relevant articles and documents
New cyclic skin whiteninig agent
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Paragraph 0116; 0173-0174, (2016/11/21)
In the present invention, provided is a skin whitening agent, which is easily synthesized without side effects for skin and has an outstanding effect of inhibiting pigmentation on skin due to an outstanding effect of inhibiting the creation of melanine where a cyclic derivative compound or pharmaceutically acceptable salt thereof has a chemical structure in formula (I) and is accordingly used to achieve the purpose of the present invention. In the present invention, provided is a cyclic derivative compound or pharmaceutically acceptable salt thereof, which has an effect of whitening skin and a chemical structure in formula (I) where A is derived from an aromatic cyclic compound; B is derived from among hydrogen, O which is oxo, NH_2 which is amino, NH which is imino, C1-C10 of saturated or unsaturated straight or branched chain alkyl group, alkoxy, mono alkyl amino group or dialkyl amino group; and C_n, C_n+1 and C_n+2 are three neighboring carbons in the cyclic compound wherein n is a positive integer.COPYRIGHT KIPO 2015
Selectivity engineering of phase transfer catalyzed alkylation of 2′-hydroxyacetophenone: Enhancement in rates and selectivity by creation of a third liquid phase
Yadav, Ganapati D.,Desai, Neesha M.
, p. 749 - 756 (2012/12/26)
Enhancements in rate of reaction and selectivity of the desired product in biphasic reactions are achieved by creating a third liquid phase, under appropriate conditions, where the third liquid phase is the locale of the main reaction, having a dramatic effect on product distribution in complex chemical reactions. Thus, in the case of phase transfer catalysis (PTC), conversion of liquid-liquid (L-L) PTC into liquid-liquid-liquid (L-L-L) PTC is of considerable techno-commercial interest resulting in waste minimization which is a major theme of green chemistry. Etherification of 2′-hydroxyacetophenone with 1-bromopentane, under traditional liquid-liquid phase transfer catalysis, results in loss of catalyst. However, the transformation of two liquid phases into three liquid phases (L-L-L) PTC leads enhancement in rates by orders of magnitude, with 100% conversion of the limiting reactant 1-bromopentane and 100% selectivity to 2′-pentyloxyacetophenone. This strategy eliminates separation problems and results in high reaction rates reducing the total reaction time. Moreover, the catalyst-rich third phase is recycled more than 7 times without loss in activity. The kinetics of the reaction are studied in great detail. There is a substantial reduction in activation energy under L-L-L PTC vis-a-vis L-L PTC, where the locale of the reaction is shifted from the organic phase to the third phase.
