Study of the temperature dependent dynamic behavior of benzylic lithium compounds by nuclear magnetic resonance.

摘要

The nature of the bonding within a series of benzylic lithium compounds and their dynamic behavior has been investigated in this dissertation. The nature of the ionic character of the carbon metal bond in conjugated organolithium compounds has been investigated. Through the use of NMR line shape analysis, the dynamics of carbon lithium bond exchange and the reorientation of the complexed ligand with respect to the counter ion has been uncovered.;The ;The scalar coupling between two atoms is dependent on the covalent character of the bond between them. Since no coupling had been previously observed for delocalized organolithium compounds, it had been theorized that these compounds exist as tight ion pairs. Scalar coupling of 2.8 Hz. was discovered for (;The barrier to rotation around the benzyl ipso bond of (para-tert-butyl- (;Scalar coupling between the benzyl carbon and lithium of ( (3- (bis(2-methoxyethyl)- amino) propyl) benzyl) (