Polyamines and their preparation
US4967008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1990 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Jan 12, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to polyamines represented by the following general structure: ##STR1## where R is an organic group, R' is H or CH.sub.3, and PA1 x=0-3 Tri, tetra, penta, and hexa amines, accordingly, are disclosed. The method for making the novel polyamines comprises a multi-step reaction that commences in step (a) with the cyanoethylation of a primary amine, R--NH.sub.2, with acrylonitrile under cyanoethylation conditions to form an aminonitrile of the structure R--NH--CH.sub.2 --CH.sub.2 --CN. The aminonitrile in step (b) is methylated by reaction with formic acid and formaldehyde under Leuckart reaction conditions to form a monomethyl aminonitrile of the structure R--N(CH.sub.3)--CH.sub.2 --CH.sub.2 --CN. The monomethyl aminonitrile then in step (c) is reduced, preferably by hydrogenation under hydrogenation conditions, to form a monomethyl diamine of the structure R--N(CH.sub.3)--CH.sub.2 --CH.sub.2 --CH.sub.2 --NH.sub.2. The monomethyl diamine then in step (d) is chain extended again by cyanoethylation with acrylonitrile under cyanoethylation conditions to form a monomethyl diaminonitrile of the structure R--N(CH.sub.3)--CH.sub.2 --CH.sub.2 --CH.sub.2 --NH--C…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.