Chiral Organosiucon Compounds. Part 1. Synthesis of Chiral Silyl Enol Ethers

A convenient synthesis of menthol- and borneol-derived chiral silyl enol ethers is described.     

Meson production in p + d reactions

Total and differential cross sections for the reactions p + d → ³He + m ⁰ with m=π, η and p + d → ³H+π⁺ were measured with the GEM detector at COSY for beam momenta between threshold and the maximum of the corresponding baryon resonance. For both reactions a strong forward-backward asymmetry was found. The data were compared with model calculations. The aspect of isospin symmetry breaking is studied. Representing the GEM Collaboration     

Diastereoselectivity in α-Benzylation Reactions of Esters of Spiro[bornane-3,2′-indan]-2-exo-ol

The α-benzylation of a series of alkanoic esters of spiro[bornane-3,2′-indan]-2-exo-ol has been investigated and shown to proceed in 9–60% d.e.     

Asymmetric Simmons-Smith Cyclopropanation Of α,β-Unsaturated Bornane-2,3-Diol Acetals

Reactionofselected α, β-unsaturated aldehydes with bornane-2-exo,3-cxo-diol has afforded a series of novel, chiral acetals which, on treatment with a Simmons-Smithreagent, undergo diastereoselective(46 - 70 %d.e.) cyclopropanatioa