Synthesis of ketene butyltelluro(phenylseleno)acetals by the Al/Te exchange reaction
摘要:
Hydroalumination of acetylenic selenides occurs, regiospecifically and the vinyl alanes obtained as intermediates were transformed into ketene butyltelluro (phenylseleno) acetals by the Al/Te exchange reaction using C4H9TeBr as electrophile. The stereoselectivity of the hydroalumination of chalcogeno acetylenes was confirmed by performing the hydrolysis of the vinyl alane intermediates that results in formation of the correponding Z phenylseleno alkenes with good yields.
The addition of selenophenol to mono - and di-substituted unactivated acetylenes have been investigated. At room temperature the vinylicselenides obtained were predominantly of the Z configuration; at 120°C Z/E mixtures were produced. Vinylicselenides with the E configuration were obtained by reduction of the corresponding selenoacetylenes with lithium aluminium hydride.
synthesis of a vast variety of heteroatom‐containing cyclobutene‐triflones [bis(trifluoromethylsulfonyl)cyclobutenes] and cyclobutenones has been developed starting from heteroatom‐substituted alkynes and a pyridinium salt (a latent Tf2C=CH2 source). This powerful methodology, involving cyclization reactions, allows for the selective preparation of oxygen‐, nitrogen‐, bromine‐, chlorine‐, iodine‐, sulfur‐
从杂原子取代的炔烃和吡啶鎓盐(潜在的Tf 2 C = CH 2来源)开始,开发了可控制的无金属合成各种杂原子的环丁烯-triflones [双(三氟甲基磺酰基)环丁烯]和环丁烯酮。。这种强大的方法涉及环化反应,可以选择性地制备氧,氮,溴,氯,碘,硫,硒,碲,磷和硅官能化的环丁烯衍生物。
A New Synthesis of <i>α</i>-Phenylseleno Esters and Acids from Terminal Alkynes
Alkynyl phenyl selenides, easily prepared from terminal alkynes, react with p-toluenesulfonic acid to afford (Z)-α-(phenylseleno)vinyl p-toluenesulfonates. The reactions of these compounds with phenylselenyl sulfate in the presence of alcohols or water give the corresponding α-phenylseleno esters or acids, respectively.
Mechanochemical Synthesis of Active Magnetite Nanoparticles Supported on Charcoal for Facile Synthesis of Alkynyl Selenides by C−H Activation
作者:Balaji Mohan、Ji Chan Park、Kang Hyun Park
DOI:10.1002/cctc.201600280
日期:2016.7.20
Magnetite (Fe3O4) nanoparticlessupported on charcoal, graphene, or SBA‐15 were prepared by a simple solid‐state grinding technique and subsequent thermal treatment. The Fe3O4 nanoparticlessupported on activated charcoal exhibited high catalytic activity and furnished good yields of the alkynyl selenide product in the cross‐couplingreaction of diphenyl diselenide and alkynes through activation of
通过简单的固态研磨技术和随后的热处理制备了负载在木炭,石墨烯或SBA-15上的磁铁矿(Fe 3 O 4)纳米粒子。负载在活性炭上的Fe 3 O 4纳米颗粒表现出高催化活性,并在生态友好条件下通过活化C-H和Se-Se键,在二苯基二硒化物与炔烃的交叉偶联反应中提供了炔基硒化物产物的良好收率。传统的铜基催化剂可实现相同的有机转化。