Structural Characterization and Unique Catalytic Performance of Silyl-Group-Substituted Geminal Dichromiomethane Complexes Stabilized with a Diamine Ligand
Stabilization by a silyl group on the methylene carbon and a diamine ligand led to the isolation of gem-dichromiomethane species. X-ray crystallography confirmed the identity of the structure of this rare example of reactive gem-dimetalloalkane species. The isolated gem-dichromiomethane complex acted as a storable silylmethylidene carbene equivalent, with reactivity that could be changed dramatically
(Diiodomethyl)trimethylsilane (Me3SiCHI2, 1) is produced by treatment of iodoform with manganese in the presence of Me3SiCl. Aldehydes are converted to (E)-1-trimethylsilyl-1-alkenes in a stereosel...
One-Pot Transformation of RCHO to (<i>E</i>)-RCH=CHSiMe<sub>3</sub> Using CHI<sub>3</sub>, Mn, Me<sub>3</sub>SiCl, and a Catalytic Amount of CrCl<sub>2</sub>
Iodoform is reduced with manganese in the presence of Me3SiCl to give Me3SiCHI2 (1). A one-pot transformation of aldehydes to (E)-1-alkenyltrimethylsilanes is then performed with iodoform, manganese, Me3SiCl, and a catalytic amount of chromium(II) chloride in THF via in situ formation of 1.
Chromium-catalyzed cyclopropanation of alkenes with bromoform was achieved to produce the corresponding bromocyclopropanes.
利用溴仿进行的铬催化烯烃环丙烷化反应成功地制得了相应的溴代环丙烷。
Cyclization of 1,<i>n</i>-Enynes Initiated by the Addition Reaction of <i>gem</i>-Dichromiomethane Reagents to Alkynes
作者:Masahito Murai、Ryuji Taniguchi、Kazuhiko Takai
DOI:10.1021/acs.orglett.0c01304
日期:2020.5.15
Treatment of 1,n-enynes with gem-dichromiomethane species prepared in situ from 1,1-diiodomethanes and CrCl2 gave alkenylbicycloalkanes. Alkenylcarbene species, which was generated via [2 + 2] cycloaddition with a triple bond, were intercepted by intramolecular cyclopropanation of a pendant double bond, and alkene metathesis did not proceed. This is a very rare example of transformation of alkynyl