TMED, TMEDA

Bicyclobutanyllithium-TMED A 2 Phenyllithium-TMED A 2 H-C, chelated TMEDA... 

Synthetic Application of (Benzyllithium —TMED A and Benzyl-lithium—TED. All the synthetic application studies were run with an aged (benzyllithium)2-TMEDA toluene solution that had 0.8% of the total organolithium compounds present as the tolyllithium isomers (only meta present) or with benzyllithium-TED crystalline complex free of ring isomers. 

The overlap of the sodium and potassium 3p and 4p orbitals with the carbon 2p orbitals should not be nearly as effective as that of the lithium 2p. Those metals should therefore form complexes that fit the electrostatic model described in Figure 29 more closely. The potassium ion in (TMED)K fluorenyl is disolvated but not chelated by bridging TMEDA groups. The result is a polymeric system in the solid state with each fluorenyl group coordinated to two potassium atoms (Figure 30). The projection of one of the potassium atoms onto the fluorenyl plane is at a point within the periphery of the five-membered ring and also within 0.2 A of the position predicted for the electrostatic model. 

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