Laboratoire de Chimie de Coordination, Faculté des Sciences SemLalia B.P. 2390 Marrakech, Morroco E-mail: [email protected]
Received: 15 December 2000 / Accepted: 15 May 2001 / Published: 25 May 2001
All reactions were carried out under dry nitrogen
using Schlenk techniques. 2,4–Dimethyl-3-phenyl-[2’-methyl-3’-chloro]-7-chloro-8-methyl-1,3-diaza-2,4-diboranaphtalene
tricarbonylchromium complexes were obtained by a classical method [1].
A solution of ligand (0.3 g, 0.907 mmol) and Cr(CO)6 (0.3 g,
1.36 mmol) in 30 mL of dibutyl ether and 5 mL of THF was heated under reflux
for 48 h under vigorous stirring. A strong yellow color shows the formation
of the complex. After cooling and filtration through silica gel, the solution
was evaporated to dryness. The crude product is a mixture of two isomers
(0.19 g, 45%, Mp: 165°C). Reaction with Cr(CO)3 gives exclusively
the compounds with Cr(CO)3 h6-bonded
to the benzo part of the molecule [2]. The two isomers were separated by
silica gel chromatography with diethyl ether/hexane mixture (25/75).
Isomer 1, Mp:180-182°C; isomer 2, Mp:176-178 °C.
1H (500 MHz) and 13C NMR (125 MHz) chemical shifts for isomer 1 and isomer 2
References
1. Mahaffy, C. A. L.; Pauson, P. L. Inorg.
Synth. 1979, 19, 154.
2. Allaoud, S.; Karim, A.; Mortreux, A.; Petit,
F.; Frange, B. J. Organomet. Chem. 1989, 89, 379.
Sample availability: available from the authors and MDPI.
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