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:
Aug. 11, 1992
Filed:
Jul. 31, 1991
Applicant:
Inventor:
John F Lang, Webster Groves, MO (US);
Assignee:
Mallinckrodt Specialty Chemicals Company, St. Louis, MO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
568435 ; 568425 ; 568426 ; 568437 ;
Abstract
4-fluorobenzaldehydes are formed from compounds of the formula (I) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different, and represent H, halogen, or an alkyl group of from 1 to about 10 carbon atoms, wherein, when at least one of R.sub.1, R.sub.2, R.sub.3 or R.sub.4 is halogen, at least one of remaining R.sub.1, R.sub.2, R.sub.3 or R.sub.4 is alkyl. the compound of formula of (I) is reacted with a formylating agent in the presence of FeCl.sub.3 in a reaction mixture, from which is separated a compound of the formula (II) ##STR2## wherein R.sub.1, R.sub.2 , R.sub.3 and R.sub.4 are as defined above.