Regioselective Synthesis of Vinyl Halides, Vinyl Sulfones, and Alkynes: A Tandem Intermolecular Nucleophilic and Electrophilic Vinylation of Tosylhydrazones
作者:Devi Prasan Ojha、Kandikere Ramaiah Prabhu
DOI:10.1021/ol503114n
日期:2015.1.2
in tandem at the carbene center to install an electrophile and a nucleophile on the same carbon. This metal-free concept, which is unprecedented, has been illustrated by regioselectivesynthesis of a variety of vinyl halides, vinyl sulfones, and alkyne derivatives.
Synthesis of Dialkenyl Dichalcogenides via Alkenechalcogenolate Ions Generated by Treating Ketone p-Toluenesulfonylhydrazones with a Base and Elemental Chalcogen
Alkeneselenolate and alkenetellurolate ions were generated by treating ketone p-toluenesulfonylhydrazones possessing an α-methylene or an α-methine group with t-BuOK and elemental selenium or tellurium, respectively, at 110-150 °C, and were converted into dialkenyl dichalcogenides by aerobic oxidation.
通过分别用 t-BuOK 和元素硒或碲处理具有 α-亚甲基或 α-次甲基基团的酮对甲苯磺酰腙,分别在 110-150 °C 下产生烯硒烯酸和烯四烯酸离子,并通过好氧转化为二烯基二硫属化物氧化。
Dissociation of the Disilatricyclic Diallylic Dianion [(C4Ph4SiMe)2]−2 to the Silole Anion [MeSiC4Ph4]− by Halide Ion Coordination or Halide Ion Nucleophilic Substitution at the Silicon Atom
作者:Jang-Hwan Hong
DOI:10.3390/molecules16108451
日期:——
silole anion [MeSiC4Ph4]− is generated by coordination of the chloride ion at the silicon atom in 3 or by the nucleophilic substitution of either chloride or bromide ion at one of two silicon atoms in 3. The quenching reaction of 3 dissolved in THF with water gives 1,2,3,4-tetraphenyl-2-butene, the disiloxane of 1-methyl-2,3,4,5-tetraphenyl-1-silacyclo-3-pentenyl [O(MeSiC4Ph4)2] (10) and methyl silicate