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Active Magnesium from Catalytically Prepared Magnesium Hydride or from Magnesium Anthracene and its Uses in the Synthesis
Author(s) -
Bartmann Ekkehard,
Bogdanovic̀ Borislav,
Janke Nikolaus,
Schlichte Klaus,
Spliethoff Bernd,
Treber Joachim,
Westeppe Uwe,
Wilczok Ursula,
Liao Shijan
Publication year - 1990
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19901230712
Subject(s) - chemistry , magnesium , anthracene , dehydrogenation , magnesium hydride , inorganic chemistry , hydride , deoxygenation , toluene , hydrogen , reactivity (psychology) , decomposition , medicinal chemistry , photochemistry , organic chemistry , catalysis , medicine , alternative medicine , pathology
Highly reactive, pyrophoric forms of magnesium with specific surface areas of 20–109 m 2 /g (Mg * ) can be generated by the dehydrogenation of catalytically prepared magnesium hydride (MgH 2 * ) or by decomposition of magnesium anthracene · 3 THF ( 4 ). The decomposition of 4 , with recovery of anthracene and THF, may be accomplished both thermally and by ultrasound in an organic solvent (toluene, n ‐heptane) or thermally in the solid state in vacuo. Mg * obtained by the latter method exhibits only weak reflections in the X‐ray powder diagram and has, in comparison to other mentioned Mg * species, the highest reactivity toward hydrogen. Diverse Grignard compounds can be prepared under mild conditions (⪕25°C) in THF or ether as well as in hydrocarbons by using Mg * from MgH 2 * from MgH 2 * or 4 . The cleavage of THF with formation of 1‐oxa‐2‐magnesiacyclohexane ( 2 ) is possible by employing Mg * from MgH 2 * or 4 .