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小木虫论坛-学术科研互动平台 » 科研生活区 » 专业外语 » 计算模拟 » 一段英语翻译
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zhenwuhuang

至尊木虫 (文学泰斗)

[求助] 一段英语翻译

Preparation of 77Se-selenomethionine.
(S)-(−-α-Amino-γ-butyrolactone
hydrochloride (500 mg) was dissolved in HBr-saturated acetic acid (5 mL),
followed by refluxing for 5 h. The reaction mixture was allowed to stand for 12 h
at room temperature to afford α-amino-γ-bromobutyric acid hydrobromide as
white crystals (yield, 92%).
77Se-Selenium (metal powder, 7.0 mg) wassuspended in dry THF (1 mL) under an atmosphere of nitrogen, and then CH3Li
(1 M THF solution, 2.7 mL) was added, followed by stirring at room
temperature for 5 min.
α-Amino-γ-bromobutyric acid hydrobromide (71 mg)
dissolved in dry ethanol (0.5 mL) was gradually added to the reaction mixture,
followed by refluxing for 1 h. The reaction mixture was evaporated in vacuo,
and the residue was dissolved in an aqueous solution of HCl (1 M, 1.5 mL) and
washed with diethylether (2 mL, twice). The aqueous layer was neutralized with
1 M NaOH and then purified on an ODS column to afford 77Se-SeMet (yield
estimated by selenium, 51%).
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