Process to prepare a multidentate phosphite compound
US5710306A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 15, 1996 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Mar 15, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/822
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process to prepare a multidentate phosphite compound according to the general formula (1) ##STR1## in which n is 2-6, R is an n-valent organic group and R.sup.1 and R.sup.2 are fused aromatic ring systems with 2 or more rings, which rings are substituted on the ortho position relative to the oxygen atom only with hydrogen, by first preparing a phosphorochloridite compound from a R.sup.1 --OH and R.sup.2 --OH alcohol compound and a phosphorus chloride compound and subsequently contacting the phosphorochloridite compound with an alcoholic compound according to R--(OH).sub.n, wherein the phosphorochloridite is prepared by performing the two steps in a solvent: PA1 a) contacting a compound with the general formula: ##STR2## in which R.sup.3 and R.sup.4 are C.sub.1 -C.sub.4 alkyl groups, with the R.sup.1 OH and R.sup.2 OH compounds, and PA1 b) contacting the resulting compound of step (a) which has the formula (3): ##STR3## with HY, wherein Y is a halogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.