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- W1884802017 abstract "Abstract Strongly basic anion‐exchange resins in OH − form, partially neutralized with 4‐hydroxy‐3‐formylbenzenesulfonic acid (5‐sulfosalicylaldehyde) (SSA) could be shown to catalyse the racemization of neutral and basic optically active α‐amino acids in the presence of copper (II) ions at moderate temperatures (25‐45 °C). Under these conditions ( S )‐asparagine is racemized without hydrolysis of its amide groups. The heterogeneous racemization of ( S )‐alanine is accelerated by a factor of 880 as compared to a homogeneous reaction. The efficiency of heterogeneous catalysis depends on (1) the extent of neutralization of anion exchanger with SSA, (2) the type of the resin used and (3) the quantity of Cu(II) ions in the reaction mixture. The experimental data are in accordance with the fact that heterogeneous racemization of amino acids proceeds via the formation of a reactive copper(II)‐Schiff's base complex. The heterogeneous catalysts can be recycled. The anion exchangers can be regenerated and, if necessary, re‐used." @default.
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- W1884802017 doi "https://doi.org/10.1002/macp.1986.021870503" @default.
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