Chemical process for preparing 3-phenoxybenzyl chloride
AssigneeEthyl Corporation
InventorKestutis A. Keblys
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Abstract
Reaction of 3-phenoxytoluene with bromine at elevated temperature yields 3-phenoxybenzyl bromide, 3-phenoxybenzal bromide, or a mixture thereof. In contrast to teachings of the prior art, phosphorus halide catalysis or u.v. activation is not required to achieve a desirable amount of side-chain bromination with a minimum of nuclear halogenation. For example, it was observed that at 265.+-.5.degree. C., good yields of the desired benzyl and benzal bromide were obtained, but no nuclear halogenated by-product was detected by gas chromatography. The comparable chlorination is also effective.
Claims3
A process for preparing m-phenoxybenzyl chloride, or m-phenoxybenzal chloride, or a mixture thereof, said process comprising chlorinating m-phenoxytoluene with chlorine at a temperature of about 250.degree.-260.degree. C., said process being conducted in the absence of a catalyst and in the absence of added u.v. radiation, said process being characterized by formation of a low amount of nuclear chlorinated by-product.
A process for preparing a product selected from the class consisting of m-phenoxybenzyl chloride, m-phenoxybenzal chloride, and mixtures thereof, said process comprising reacting about 0.7-2.5 moles of chlorine with each one mole quantity of m-phenoxytoluene at a temperature of about 250.degree.-260.degree. C., said process being carried out in the absence of added u.v. radiation and in the absence of phosphorous halide, said process being characterized by formation of a low amount of nuclear chlorinated by-product.
Dependencies are inferred from the claim text.