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- W2060293669 abstract "A convenient radiosynthesis of asymmetric [75Se]selenoethers was developed using 1,3-disubstituted [75Se]selenoureas as intermediates. These were prepared from appropriate carbodiimides and hydrogen [75Se]selenide, which could only be generated from carrier-added (c.a.) [75Se]selenite in aqueous solution using phosphinic acid as reducing agent. Optimization of this initial labelling step with dicyclohexylcarbodiimide and polymeric N-cyclohexylcarbodiimide-N′-methyl polystyrene resulted in radiochemical yields (RCY) of 73 and 55% (bound on the polymer), respectively, within 45 min. Treatment of [75Se]selenoureas with alkylbromides led to corresponding [75Se]selenouronium salts in nearly quantitative yields. Hydrolysis under basic conditions provided the [75Se]selenolates and a second alkylation yielded asymmetric [75Se]selenoethers. Thus, within 90 min benzylmethyl[75Se]selenide, benzylbutyl[75Se]selenide, benzylisopropyl[75Se]selenide and 1-phenyl-l-(methyl[75Se]seleno)ethane were synthesized with respective RCY of about 59, 55, 10 and 60%. Furthermore, the 75Se-labelled alkylating agent 3-(methyl[75Se]seleno)-1-propanyl p-toluenesulfonate and [75Se]selenomethionine were obtained with radiochemical yields of 51 and 41%, respectively. Copyright © 2001 John Wiley & Sons, Ltd." @default.
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- W2060293669 date "2001-01-01" @default.
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- W2060293669 title "Synthesis of asymmetric [75Se]selenoethers via carbodiimides" @default.
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- W2060293669 doi "https://doi.org/10.1002/jlcr.488" @default.
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