Process for preparing substituted 2,2'-methylene-bis-[6-(2H-benzotriazol-2-yl)-4-hydrocarbyl-phenols]
US5166355A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1991 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Feb 4, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C49/84
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method is described for preparing compounds of Formula I and Formula II: ##STR1## R.sub.1 is an alkyl group of one to twelve carbon atoms or a cycloalkyl group of five to eight carbons, X is chloro or hydrogen, and R.sub.2 is an alkoxy group having one to twelve carbons. In accordance with the method: PA1 (a) a bis(dialkylamino)methane is formed, preferably by reacting a dialkylamine of the formula HNR.sub.3 R.sub.4 (wherein R.sub.3 and R.sub.4 are independently alkyl groups having three or more carbons) and a solid formaldehyde material to produce the corresponding bis(dialkylamino)methane, PA1 (b) a monomer of Formula III or IV ##STR2## in which R.sub.1 is an alkyl group of one to twelve carbons or a cycloalkyl group of five to eight carbons, X is chloro or hydrogen and R.sub.2 is an alkoxy group having one to twelve carbon atoms, is mixed with an alkaline catalyst with heating at a temperature high enough to drive off the liquid formed in the reaction, PA1 (c) the product of steps (a) and (b) are combined and stirred at a temperature sufficient to drive the reaction for six to fourteen hours, and PA1 (d) thereafter the resulting compound of Formula I is collected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.