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Mohammad A. Rahman Biing-Ming Su Elliot Band Mojahedul Islam 《Journal of surfactants and detergents》2011,14(3):333-338
An efficient procedure for the regioselective synthesis of secondary alcohol alkoxylates from 2,2,4-trimethyl-1,3-pentanediol (TMPD) is described. TMPD was reacted with propylene oxide followed by ethylene oxide in the presence of a catalytic amount of alkali metal hydroxide to form secondary alcohol alkoxylates. Instead of a mixture of compounds resulting from the reaction of TMPD and propylene oxide, the primary hydroxyl group of the TMPD reacted to form predominantly 2,2,4-trimethyl-3-hydroxypentylpropoxylate as the major product. On further ethoxylation the less hindered secondary hydroxyl group of the 2,2,4-trimethyl-3-hydroxypentylpropoxylate reacted predominantly. 13C NMR indicated that the secondary hydroxyl group (96.2 mol%) of TMPD remained unreacted during alkoxylation. 相似文献
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The micellar structure of a barium nonylphenolate/barium carbonate complex was characterized by 1H and 13C nuclear magnetic resonance (NMR) spectroscopy. Several NMR techniques, including measurement of spin-lattice relaxation
time, chemical shift variation, and line width of the 1H NMR signal and solid-state 13C NMR data, were used in this study. NMR results indicate that the prepared barium nonylphenolate and barium carbonate complex
formed a micelle structure with the oxygen atom of the nonylphenolate ring oriented toward the solid-state center core of
barium carbonate while the highly branched aliphatic chain pointed outward to the hydrocarbon solvent. 相似文献
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