om049594v_si_001.cif (31.75 kB)
Insertion of Carbon Dioxide into Mg−N Bonds. Structural Characterization of a Previously Unknown η2 Chelation Mode to Magnesium in Magnesium Carbamates
dataset
posted on 2004-09-27, 00:00 authored by Yongjun Tang, Lev N. Zakharov, Arnold L. Rheingold, Richard A. KempInsertion reactions of CO2 into magnesium
amides that yield carbamates are known, and several
different bonding modes of the −O2CNR2 moiety to
magnesium have been previously identified. However,
conspicuous by its absence is the simplest mode of
chelation of the carbamate to a single Mg atom, the η2
chelating mode. We have now discovered that the insertion of CO2 into Mg2(NCy2)4 (Cy = cyclohexyl) in THF/HMPA (HMPA = hexamethylphosphoramide) forms the
unsymmetrical dinuclear compound [Mg2(O2CNCy2)4(HMPA)] (1). X-ray diffraction analysis shows that 1
contains three different bonding modes of the carbamate
to the Mg atoms, including the first example of the
terminal bidentate η2 mode.