An intramolecularly stabilized arylboron dibromide

✍ Scribed by David S. Brown; Claire J. Carmalt; Alan H. Cowley; Andreas Decken; Harold S. Isom

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 200 KB
• Volume: 9
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/(sici)1098-1071(1998)9:1<79::aid-hc10>3.0.co;2-#

✦ Synopsis

A new boron dibromide featuring intramolecular Lewis base coordination, ArBBr 2 (4; Ar ‫ס‬ 2-[(dimethylamino)methyl]phenyl) has been prepared via the salt-elimination reaction of [2-(Me 2 NCH 2 )C 6 H 4 ]Li with BBr 3 . Single-crystal X-ray diffraction experiments reveal that 4 rystallizes in two polymorphs, both of which are 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.