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6Li- and 15 N-NMR spectroscopic analyses of a labeled chiral bidentate lithium amide ([ 6 Li, 15 N 2 ]-(R)-1) have shown that it exists as a chelated monomer (5) in THF and in DME, as a chelated dimer (6) in toluene and in ether, while as a chelated monomer (5) in any of these solvents in the presence of 2 equivalents of HMPA. Solvent-dependent enantioselectivities...
Zirconium promoted diene cyclization of 13 and 17 followed by carbonylation and treatment with iodine and then 10% HCl gave two tricyclic ketones, 16a and 16b, by one pot. One of them posseces a trans-fused bicyclo[3.3.0]octane unit and the other has an angular triquinane, silphinene skeleton.
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