The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1978
Filed:
Aug. 04, 1977
John Henry Bonfield, Basking Ridge, NJ (US);
Andiappan Kumaresa Murthy, Lake Hiawatha, NJ (US);
Donald Pickens, Mendham, NJ (US);
Allied Chemical Corporation, Morris Township, NJ (US);
Abstract
In the halogenation under reflux conditions of an aldehyde of the formula ##STR1## with Cl.sub.2, Br.sub.2 or I.sub.2, the aldehyde and halogen are continuously fed into a reactor at a molar ratio of halogen to aldehyde between about 0.8:1 and about 1.1:1 and water is continuously fed into the reactor at a rate of between about 1 and about 20% by weight of aldehyde. The product .alpha.-haloaldehyde is thioalkylated and then oximated to form a 2-hydrocarbylthioaldoxime of the formula ##STR2## with improved yield and quality because of the improved yield and quality of .alpha.-haloaldehyde. An exemplary process includes the chlorination of isobutyraldehyde (IBA) to form .alpha.-chloroisobutyraldehyde (CIBA), the thiomethylation of CIBA to form 2-methyl-2 methylthio-propionaldehyde (MTIBA) and the oximation of MTIBA to form 2-methylthio-propionaldehyde oxime (aldicarb oxime or ADO).