Facile, Catalytic Dehydrocoupling of Phosphines Using β‐Diketiminate Iron(II) Complexes
作者:Andrew K. King、Antoine Buchard、Mary F. Mahon、Ruth L. Webster
DOI:10.1002/chem.201503399
日期:2015.11.2
Catalytic dehydrocoupling of primary and secondary phosphines has been achieved for the first time using an iron pre‐catalyst. The reaction proceeds under mild reaction conditions and is successful with a range of diarylphosphines. A proton acceptor is not needed for the transformation to take place, but addition of 1‐hexene does allow for turnover at 50 °C. The catalytic system developed also facilitates
bond in three series of alkenylsilanes, R3Si·[CH2]n·CHCH2(R = Me, Ph, or Cl) toward addition by the trichloromethylradical have been determined, and the relative reactivities of vinyl- and allyltrimethylsilane toward free radicaladdition by n-dodecanethiol have been investigated. The factors influencing the reactivities of the various alkenylsilanes toward radicaladdition reagents are discussed.
Lithium or Bromomagnesium 1,4- and 1,5-Dilithioalkan-2-yloxides: Preparation and Synthetic Applications
作者:José Barluenga、José R. Fernandez、Miguel Yus
DOI:10.1055/s-1985-31412
日期:——
Treatment of chloromethyl 2- or 3-chloroalkyl carbinols with butyllithium and then lithium naphthalenide or with ethylmagnesium bromide and then powdered lithium leads to the formation of lithium or bromomagnesium dilithioalkoxides, respectively, which represent trianionic species. The bromomagnesium 1,Ï-dilithio-2-alkoxides undergo immediate elimination of lithium bromide and magnesium oxide to give Ï-lithio-1-alkenes. These latter organometallic compounds as well as the lithium dilithioalkoxides react with various electrophiles to ,afford functionalized compounds.