1,1 -Binaphthalene-2,2 -diol complexes titanium

The modification by-passes the use of molecular sieves, often recommended by other authors, and is claimed to improve the reproducibility of the reaction. In a Schlenk tube, 2 mL of degassed toluene was added to 60 mg (0.2 mmol) of (i )-l,r-binaphthalene-2,2 -diol, then 59 pL (0.20 mmol) of titanium isopropoxide was added. After stirring for 1 hour, the solvent was removed. These complexes are not air stable and were stored in Schlenk tubes under Argon. For the catalytic allylation reactions the complexes were prepared just before use. 

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