The Magnesium Route to Active Metals and Intermetallics

Subvalent Organometallic Compounds of the Alkaline Earth Metals in Low Oxidation States

“…Reduction of annulated benzene systems with alkaline earth metals led in all known cases to the formation of divalent metal ions Ae 2+ and reduced negatively charged arenes. Bogdanović and co‐workers110,111 studied the reduction of anthracene (C 14 H 10 ) with alkaline earth metals for activation purposes of the corresponding metals by thermal decomposition (in some cases room temperature is sufficient) of the generated complexes 112. The direct synthesis of the heavier alkaline earth metals with anthracene in THF yields the corresponding singly or doubly reduced anthracene complexes: [(thf) 3 Mg(C 14 H 10 )], [(thf) 4 Ca(C 14 H 10 )], [(thf) 6 Ca(C 14 H 10 ) 2 ], [(thf) 2 Sr(C 14 H 10 )] and [(thf)Ba(C 14 H 10 )] 113.…”

Stable “Inverse” Sandwich Complex with Unprecedented Organocalcium(I): Crystal Structures of [(thf)2Mg(Br)-C6H2-2,4,6-Ph3] and [(thf)3Ca{μ-C6H3-1,3,5-Ph3}Ca(thf)3]

“…Recent quantum chemical calculations also corroborated the particular stability of such "inverse" sandwich cations. 18 The reduction of anthracene with alkaline earth metals was already studied in detail by Bogdanovic ´and others 19,20 in order to activate the alkaline earth metals. Anthracene reacted with magnesium to form [tris(tetrahydrofuran)magnesium anthracene] and decomposed at elevated temperatures yielding anthracene and highly activated and pyrophoric magnesium powder.…”

Ultrasound in Synthetic Organic Chemistry

“…It is clear from literature that ultrasound has also beneficial effects in the formation of nanocomposites, nanotubes, mesoporous materials, or for the synthesis of catalysts on a carrier [20][21][22][23]. Formulations or crystallisation processes are also not discussed in detail based on the scope of this book.…”