Department of Chemistry, Faculty of Mathematics and Natural Sciences, Brawijaya University, Malang, Indonesia
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@article{JKSA42589, author = {Siti Mariyah Ulfa and Alma Miranda and Fath Dwisari and Mohammad Rahman}, title = {Facile synthesis of 5-Isopropyl-2,3-dimethylbenzene-1,4-diol by Friedel-Crafts and Determination of Partition Coefficient in n- Octanol/Water}, journal = {Jurnal Kimia Sains dan Aplikasi}, volume = {25}, number = {1}, year = {2022}, keywords = {alkylation reaction; Brønsted acid; hydroquinone; isopropyl alcohol; partition coefficient}, abstract = {The wide therapeutic effect of quinone-based drugs has received considerable interest for a long time. In this research, Friedel-Crafts performed a facile synthesis of quinone derivatives using the mixture of Brønsted acid. Reflux of 2,3-dimethylhydroquinone (1), isopropanol, glacial acetic acid, and H 2 SO 4 for 15 minutes gave yellow oil product of 5-isopropyl-2,3-dimethylbenzene-1,4-diol (2) as a major product. Characterization using Nuclear Magnetic Resonance (NMR) revealed the methine proton splitting for isopropyl at δ 3.13 ppm, which has a cross-coupling with aromatic carbon at δ 119.6 ppm suggested the substitution of a proton on quinone ring with isopropyl group. Analysis Fourier Transform Infra-Red (FT-IR) showed the broad spectrum of –OH, the vibration of CH sp 3 , and isopropyl groups. The minor products identified as 5-isopropyl-2,3-dimethylcyclohexa-2,5-diene-1,4-dione (3), 5-isopropyl-2,3-dimethyl-1,4 phenylene diacetate (4), and 2,3-dimethylbenzene-5,6-isopropyl-1,4-diol (5) confirmed from 2D HETCOR and MS analysis. The partition coefficient (log P ) of compound 2 showed a higher solubility by 1.9-fold compared to hydroquinone 1. It is suggested that an additional methyl group increased the partition into the organic phase.}, issn = {2597-9914}, pages = {7--12} doi = {10.14710/jksa.25.1.7-12}, url = {https://ejournal.undip.ac.id/index.php/ksa/article/view/42589} }
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Novel bromoalkyl-1,4-benzoquinones as anti-inflammatory candidate toward COX signaling: Synthesis, octanol-water solubility, and in-silico drug-target profiling
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