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1,1-bis(Methylsulphinyl)-3-phthalimidopropanes 1S)-(+)-percamphoric acid 2-phthalimido-4,4-bis(methylthio 4,4-bis(methylthio)butyric acid 3a absolute configuration added dropwise Anal analytical sample asymmetric oxidations Asymmetric Synthesis butyric acid 3c calc calc'd CH₂S CH₂SO CHCI Chem CO₂H CODEN colourless Croatia crystallized d,l-disulphoxide Deljac diamond-lattice diethyl ether distilled dropwise under stirring Et₂O ethereal solution evaporated to dryness filtrate gave glass wool Corning HR CH3 hypothetical transition JUGOSLAVENSKE AKADEMIJE ZNANOSTI Laboratory lactone MeOH methanol methyl methylthio mmol Montanari niger NRRL 337 NMR spectra optical rotation Organic Natural Compounds oxidation with 1S)-(+)-percamphoric percamphoric acid Prelog preparative TLC propane Pyrolysis R=phthalimido Rad Jugosl RADCEA YU ISSN Raney nickel reaction mixture Recrystallization from EtOH reduced pressure ric acid SCH3 Scheme sign of optical Silica Gel SOCH sodium iodate sodium periodate solution of 4,4-bis(methylthio)butyric SPOJEVA stereoisomers 1-3 Strossmayerov trg 14 structure Sulphoxides obtained summarized on Table synthesis t-butyl temperature Tetrahedron Lett University of Zagreb viscous oil Yugoslav Academy ZNANOSTI I UMJETNOSTI