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<http://eprints.uny.ac.id/id/eprint/5224> <http://purl.org/ontology/bibo/abstract> "Pelitian ini bertujuan untuk mensintesis senyawa 4-hiclroksikalkon de.ngan reaksi demetilasi 4ymetoksikalkcin, menentukan karakteristik senyawa hasil sintesis dan menghitung rendemennya.\r\n Sintesis 4-hidroksikalkon dilakukan dengan reakai demerilasi rnenggamakan ballan dasar 4-metoksikalkon hasil sintesis dengan keniurnian 97,7%. Reaksi demetilasi digunakan untuk memecah eter pada senyawa 4¬metoksikalkon dan dilakukan dengan katalis All-1 pada suhu 46°C selama 4 jam dalarn pelarut CS2. Reaksi ini dilakukan dalam sistem tertutup untuk rnenghindari terjadinya reaksi oksidasi. Endapan yang diperoleh direkristalisasi menggunakan metanol untuk menghilanglcan serbul€ aluminium sisa. Kristal yang diperolch dilaru.tkan dalam dietil eter dan diekstrak menggunakan larutan NaISIO, 1N untuk menghilan,,,,kan sisa 1, Fasa organik diuapkan dan didiamkHn untuk memperaleh kristal. Kristal yang- terbentuk direk-ristalisasi ntenggi.rnakan pelarut. Kristal hasil rekristaiisasi diuji dengan pereal<ai warna FeC'1; -5% drrn petnbentukan garam fenolat serta dianalisis dengan TLC, \"I'LC Scanner, spektrometer UV - Vis, IR dan 'H-NMR.\r\n Hasil penelitian int adalah senyawa 4-hidroksikalkor. dengan bentuk kristal, h;erwarqa kuning, beratnya 1,28 gram dan titik Melt ? 1 -5 ~ 120 °C._ SenyaNva hasil sintesis bereaksi positif terhadap pereaksi warna FeCI; 5% clan dapat menabentuk garanl fc;nolat_ Ker:iunnian seriyats,a in. sehesar 8?,6?`-'v dari hasil TLC Scanner- denban eluen etil asetat : diklorometrmt - 1 : 99 clan renc3emen sebesar 75,9;%."^^<http://www.w3.org/2001/XMLSchema#string> .
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