Intramolecular B-N coordination in boratabenzene complexes

abstract

• The reaction of 1-chloro-1-boracyclohexa-2,5-diene with (3-(dimethylamino)propyl)magnesium chloride followed by reaction with tert-butyllithium in ether affords lithium 1-(3-(dimethylamino)propyl)boratabenzene (8). The reaction of 8 with Mn(CO)3(CH3CN)3PF6 affords tricarbonyl[1-(3-(dimethylamino)propyl)boratabenzene]manganese(I) (15B). The crystal structure of 15B shows that it exists in the intramolecularly B-N-coordinated form with a B-N bond distance of 1.716(5) . However in toluene-d8 solution 15B is in mobile equilibrium with its ring-opened isomer 15A. Using 11B NMR spectroscopy the equilibrium constants for 15B 15A have been measured over the temperature range -35 to 48 C, allowing evaluation of H (6.0 kcal/mol) and S (23 cal/mol K).

authors

• Waas, Jack

published proceedings

• ORGANOMETALLICS

author list (cited authors)

• Ashe, A. J., Kampf, J. W., & Waas, J. R.

citation count

• 32

complete list of authors

• Ashe, AJ||Kampf, JW||Waas, JR

publication date

• January 1997

publisher

• American Chemical Society (ACS)  Publisher

published in

• Organometallics  Journal

Digital Object Identifier (DOI)

• 10.1021/om960738i

start page

• 163

end page

• 167

volume

• 16

issue

• 2

URL

• http://dx.doi.org/10.1021/om960738i