Method for the direct preparation of olefins from ketones and Gr

Details Method for the direct preparation of olefins from ketones and Gr Method for the direct preparation of olefins from ketones and Gr

1988-12-16

1991-01-01

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce aromatic

585320, 585469, C07C 120

Patent

active

049820290

ABSTRACT:
A method for the direct preparation of olefins from ketones and Grignard reagents without isolation of the intermediate alcohol and in the absence of acidic dehydration catalysts. Ketones are reacted with a Grignard reagent in the presence of a low boiling solvent for the Grignard reagent to form a Grignard reaction mixture. An active hydrogen-containing compound is added to the Grignard reaction mixture to form a reaction mixture comprising an alcohol and Grignard salts. The alcohol is dehydrated in the presence of the Grignard salts and a solvent which has a higher boiling point than solvents typically emloyed during the Grignard condensation. The higher boiling solvent can be an active hydrogen-containing compound such as n-octanol and otherwise can be added at any time, including the initial condensation step.

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Anonymous, pp. 509-511 and 166-169.

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