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The synthesis of spiro[4.4]nonane-1,6-diols via the catalytic as well as stoichiometric hydrogenation of spiro[4.4]nonane-1,6-dione was studied. Profound effects of the hydrogenation catalysts and reagents on the stereoselectivity of the products were observed. The choice of solvent also was found to have a significant influence on the product selectivity. The opening of a spiro-ring in the starting...
Both stoichiometric and catalytic amounts of N,N-dialkyl derivatives of D or L-1,2-diphenyl aminoalcohols were used as chiral ligands in the enantioselective Reformatsky reaction of benzaldehyde with ethyl bromoacetate at reflux in the presence of Zn-Cu couple with e.e. up to 64%. The effects of ligand structure and solvents used on the enantioselectivity of the reaction were also studied.
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