Abstract
Reaction of [2-(4,4-dimethyl-2-oxazoline)-5-methylphenyl]copper with dimethyltin dibromide or methylphenyltin dibromide affords [2-(4,4-dimethyl-2-oxazoline)-5-methylphenyl]dimethyltin bromide ( 1) and [2-(4,4-dimethyl-2-oxazoline)-5-methylphenyl]methylphenyltin bromide ( 2), respectively. The crystal structure of 2 has been determined by X-ray diffraction methods. C 19H 22BrNOSn is monoclinic, space group P2 t/ a with a = 18.1258(9), b = 11.5704(11), c = 9.5315(6) Å, β = 95.143(6)° and Z = 4, final R = 0.038 for 2760 observed reflections. As a result of intramolecular coordination of the nitrogen atom of the oxazoline ring to the tin atom, the geometry about tin in 1 is trigonal bipyramidal. The carbon ligands are at the equatorial sites, while the more electronegative nitrogen and bromine atoms are at the axial positions. An 1H NMR spectroscopic study showed that in solution the chiral tin center is configurationally stable up to 120°C )the highest temperature studied).
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