Sodium Selenosulfate from Sodium Sulfite and Selenium Powder: An Odorless Selenylating Reagent for Alkyl Halides to Produce Dialkyl Diselenide Catalysts
using aqueous EtOH as the solvent and avoiding the generation of a malodourous selenol intermediate, the selenylation reaction with Na2SeSO3 is much more environmentally friendly than conventional methods. Owing to the cheap and abundant starting materials and selenium reagents, our novel synthetic method reduces the production costs of dialkyl diselenides as organoselenium catalysts, thereby advancing
Na2SeSO3 可以通过 Na2SO3 与 Se 能量的反应原位生成,被发现是一种无味试剂,用于烷基卤化物的硒基化生成二烷基二硒化物。这些产品最近已被证明是羰基化合物的 Baeyer-Villiger 氧化、烯烃的选择性氧化或肟的氧化脱肟的良好催化剂。通过使用乙醇水溶液作为溶剂并避免产生恶臭的硒醇中间体,与传统方法相比,与 Na2SeSO3 的硒基化反应更加环保。由于起始原料和硒试剂廉价且丰富,我们的新合成方法降低了作为有机硒催化剂的二烷基二硒化物的生产成本,
Highly Efficient Route to Diselenides from the Reactions of Imines and Selenium in the Presence of Carbon Monoxide and Water
Reactions of selenium with imines (RR1CNR2) of aldehydes and ketones in the presence of carbon monoxide, water and triethylamine lead to reductive selenation, on aerobic work-up, to afford symmetrical diselenides (RR1CHSe)2 in good to excellent yields. The proposed mechanism suggests that both in situ generated carbonyl selenide (SeCO) and hydrogen selenide (H2Se) are involved in the reaction.
Efficient Reductive Selenation of Aromatic Aldehydes to Symmetrical Diselenides with Se/CO/H<sub>2</sub>O under Atmospheric Pressure
作者:Fengshou Tian、Zhengkun Yu、Shiwei Lu
DOI:10.1021/jo049733i
日期:2004.6.1
An efficient method for the synthesis of symmetrical diselenides is described. Reductive selenation of aromatic and heterocyclic aromatic aldehydes (ArCHO) with Se/CO/H2O in DMF afforded diselenides (ArCH2SeSeCH2Ar) in yields up to 94% underatmosphericpressure without use of a base.
描述了合成对称二硒化物的有效方法。在大气压下,不使用碱,在DMF中用Se / CO / H 2 O对芳香族和杂环芳香族醛(ArCHO)进行还原硒化,可得到产率高达94%的二硒化物(ArCH 2 SeSeCH 2 Ar)。