Selective mono-arylation and -alkylation of bis(alkylthio)benzenes
作者:M. Tiecco、L. Testaferri、M. Tingoli、E. Wenkert
DOI:10.1016/s0040-4020(01)91955-6
日期:——
developed by taking advantage of the sensitivity of reactions of Grignard reagents with aryl alkyl sulphides, catalyzed by low-valentnickelspecies, to steric effects. It is shown that the course of these reactions is influenced by the steric requirements of both the aryl and the alkyl moieties of the sulphides. Thus, selective mono-arylation and alkylation of easily available bis(alkylthio)benzenes
The palladium-catalyzed cross-coupling of intramolecularly stabilized divinyl- and diallylaluminium compounds 1 and 2 with haloarenes and chloroarene-Cr(CO)3 complexes has been studied. The coupling products were obtained in high yields (up to 98%) under relatively mild conditions (40-60 °C in THF, 3-12 h) in the presence of 5-10 mol% of PdCl2(PPh3)2.
Palladium-catalyzed reaction of arynes with a bis-π-allyl palladium complex. An efficient method for the synthesis of 1,2-diallylated derivatives of benzene
Palladium-catalyzed reaction of arynes with a bis-π-allyl palladium complex, an amphiphiliccatalyticallylating agent, afforded 1,2-diallylated derivatives of benzene in good yields.
Tandem Insertion of Halocarbenoids and Lithium Acetylides into Zirconacycles: A Novel Rearrangement to Zirconium Alkenylidenates by β-Addition to an Alkynyl Zirconocene
作者:Jozef Stec、Emma Thomas、Sally Dixon、Richard J. Whitby
DOI:10.1002/chem.201002962
日期:2011.4.18
Tandem insertion of 1,1‐dihalo‐1‐lithio species (halocarbenoids) and lithium alkynides into zirconacyclopentenes and zirconcyclopentanes affords carbocyclic products in high yields via an unusual rearrangement that probably involves addition of an organolithium species to the β‐position of a zirconium–alkyne complex to give an alkenylidene–zirconate species. A wide variety of cyclopentanoid organic