Preparation of 2-halocyclobutanones
AssigneeShell Oil Company
InventorHerman Verbrugge
Life of this patent
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Abstract
The preparation of a 2-halocyclobutanone by contacting a 2,2-dihaloalkanoyl halide with an ethylenically unsaturated compound at a temperature of at least 5.degree. C in the presence of dispersed zinc or tin and certain alkanones is conducted by using a molar ratio of zinc (or tin) to 2,2-dihaloalkanoyl halide below 1.00, with the zinc (or tin) in the form of particles having a largest dimension of up to 0.05 mm, and adopting a temperature of up to 55.degree. C.
Claims12
A process for the preparation of a 2-halocyclobutanone, wherein the halogen atom has an atomic number of up to 35, in which process a 2,2-dihaloalkanoyl halide, wherein the halogen atoms have an atomic number of up or 35, is contacted in the presence of an alkanone which has at least two branches in the carbon skeleton of the molecule and of which not more than one of the two carbon atoms attached to the carbonyl group is quaternary, with an ethylenically unsaturated compound at a temperature in the range of from about 5.degree. to 55.degree. C in the presence of dispersed zine or tin in a molar ratio of zinc or tin to 2,2-dihaloalkanoyl halide below 1.00 and wherein the zinc or tin is in the form of particles having a largest dimension of up to 0.05 mm.
Dependencies are inferred from the claim text.