The structure of 1,4-bisorganomagnesium compounds in magnesacyclopentane

Grignard condensation routes to 1,3‐disilacyclobutane‐containing cyclolinear polycarbosilanes

“…Both of the reactive di‐substituted DSCB monomers, 1,3‐dichloro‐DSCB and 1,3‐diethoxy‐DSCB, can be obtained with high purity from commercially available starting materials (98%‐99%). On the other hand, the preparation of the di‐Grignard alkanes from dihaloalkanes have been reported by many research groups to have yields around 80%, in general . The side reactions in the Grignard reaction of alkylhalides mainly include inter‐ or intra(cyclization)‐ molecular Wurtz coupling and β‐elimination, which are observed especially at elevated temperatures and when the dihaloalkane is added too quickly or in excess.…”

Zirconium-mediated cyclomagnesiation of styrene using magnesacyclopentane and 1,4-di(brommagnesium)butane as a method for the preparation of macrocyclic organomagnesium compounds

“…The individual hydrolysis products (5,6,7) and deuterolysis products (8,9,10) were isolated by high-performance liquid chromatography.…”

“…All solvents employed were purified and dried prior to use. Magnesacyclopentane and 1,4-bis(brommagnesium)butane was synthesized according to the method [5]. IR spectra of the compounds were recorded on a spectrometer Specord 75 IR.…”

Catalytic cyclometalation reaction of unsaturated compounds in synthesis of magnesa- and aluminacarbocycles

“…The structure determination of cyclic OMCs obtained through the above described procedure has demanded in due time heavy and near work [169,170]. a,x-Dimagnesium compounds were specifically converted into magnesacyclanes 131 with the aid of organomercury compounds [170][171][172].…”

“…The structure determination of cyclic OMCs obtained through the above described procedure has demanded in due time heavy and near work [169,170]. a,x-Dimagnesium compounds were specifically converted into magnesacyclanes 131 with the aid of organomercury compounds [170][171][172]. Among a number of significant achievements of the last 15À20 years in chemistry of OMCs one should consider the elaboration of synthetic methods to obtain unsaturated magnesacyclanes via direct metalation of conjugated dienes by chemically activated or highly active magnesium.…”