Lithium N-methylmethanaminide → Zirconium, tetrakis(dimethylamino)-

The lithium dimethylamide, 0.5 mole, in 250 ml of diethyl ether is chilled in an acetone/dry ice bath to -78° C. Zirconium tetrachloride, 26 g (0.112 mole), is transferred to a solid addition funnel attached to the 1000 ml Schlenk then added over 30 minutes to the magnetically stirred lithium dimethylamide slurry. The mixture is warmed slowly to room temperature then refluxed 1 hour. All volatiles are removed under vacuum at room temperature and the remaining oily solid is extracted twice with 150 ml portions of hexane. The combined extracts are reduced in solvent volume then transferred to a 50 ml flask. Solid zirconium tetrakis(dimethylamide) is distilled from the residue under reduced pressure (boiling point=40° C. to 60° C. @ 0.025 mm Hg) to give a white crystalline, low melting solid.

1. temperaturethen refluxed 1 hour
2. customAll volatiles are removed under vacuum at room temperature
3. extractionthe remaining oily solid is extracted twice with 150 ml portions of hexane
4. customthen transferred to a 50 ml flask
5. distillationSolid zirconium tetrakis(dimethylamide) is distilled from the residue under reduced pressure (boiling point=40° C. to 60° C. @ 0.025 mm Hg)
6. customto give a white crystalline, low melting solid

ORD record

ord-45175b9cab0b4a64b28061aa7612885e

Source dataset

uspto-grants-1990_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04892914