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:
Feb. 20, 1990
Filed:
Nov. 09, 1987
Khuong H Mai, Waukegan, IL (US);
Ghanshyam Patil, Vernon Hills, IL (US);
E. I. Du Pont de Nemours & Co., Wilmington, DE (US);
Abstract
Described is a process for preparing 1,2-diaminoethane having the formula ##STR1## where R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are each independently hydrogen, C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.12 cycloalkyl, C.sub.7 -C.sub.15 aralkyl, unsubstituted or substituted aryl or heteroaryl or alternatively, R.sub.1 and R.sub.2 together with the carbon atom form a 3 to 12 member cycloalkyl group, or with a heteroatom form a 3 to 12 member heterocyclic group and R.sub.3 and R.sub.4 together with the nitrogen atom form a 3 to 12 member heterocyclic group, optionally including oxygen, sulfur or phosphorus as a second heteroatom, the process comprising: reacting a preformed Schiff base with a nitroalkane as a neat mixture in the presence of a catalytic amount of an inorganic base to form the 1-nitro-2-aminoethane intermediate, which was then hydrogenated to give 1,2-diaminoethane.