Abstract
A new boron dibromide featuring intramolecular Lewis base coordination, ArBBr2 (4; Ar = 2-[(dimethylamino)methyl]phenyl) has been prepared via the salt-elimination reaction of [2-(Me2NCH2)C6H4]Li with BBr3. Single-crystal X-ray diffraction experiments reveal that 4 rystallizes in two polymorphs, both of which ave orthorhombic. The principal difference between the two polymorphs is the presence or absence of weak Br ... Br intermolecular contacts. The metrical parameters for the individual molecules of 4 are very similar for both polymorphs; the amine arm is coordinated strongly, and the boron atom adopts a somewhat distorted tetrahedral geometry. Compound 4 is surprisingly unreactive toward a variety of hydride transfer reagents. (C) 1998 John Wiley & Sons, Inc.
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