Synthesis and Characterization of Novel Intramolecularly Base-stabilized Boron Halides. Molecular Structures of 1-X2BOCR1R2-2-NMe2C6H4 [R1 = R2 = Ph, X = Cl or F; R1 = R2 = Cy, X = Cl] and [1-LiN(Ph)C(H)Ph-2-NMe2C6H4]2

The lithium alkoxides [1-(LiOCRR2)-R-1-2-NMe2C6H4](2) [R-1= R-2 = Ph (1), Cy (2)] react with BCl3 or BF3(Et2O) to give 1-(X2BOCRR2)-R-1-2-NMe2C6H4 [R-1=R-2=Ph, X=Cl (4); R-1= R-2 = Cy, X = Cl (5); R I= R2 = Ph, X = F (6); R I= R2 = Cy, X = F (7)]. The lithium amide [1-LiN(Ph)C(H)Ph-2-NMe2C6H4](2) (3) reacts with BCl3 to give 1-Cl2BN(Ph)C(H)Ph-2-NMe2C6H4 (8). Compounds 4 - 8 were characterized spectroscopically (NMR, IR, MS), and crystal structures were determined for 3 - 6.