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| Number | Title | Issue Date |
| 4960949 | Low pressure rhodium catalyzed hydroformylation of olefins The hydroformylation of olefins with rhodium complex catalysts is described. The catalysts employed comprise a rhodium complex with at least one bidentate ligand having a specified structure, ##STR1## Hydroformylation reactions at relatively low temp... | 10/02/1990 |
| 4954227 | Preparation of bidentate ligands A process is disclosed for preparing bidentate ligands of the formula: ##STR1## wherein: each AR is independently selected from aromatic ring compounds having 6 up to 14 carbon atoms, e.g., phenyl, naphthyl, phenanthryl and anthracenyl; the x bonds a... | 09/04/1990 |
| 4945178 | Preparation of 4-carboalkoxy-1,3-cyclohexanedione type compounds Acetoacetic esters of the formula R--OOCCH2 COCH3 are reacted with an unsaturated ester of the formula R1 R2 C.dbd.CHCOOR3 in the presence of basic catalyst such as ethanolic sodium ethoxide to give c... | 07/31/1990 |
| 4939309 | Preparation of biaryl compounds A method for the preparation of biaryl compounds is disclosed which comprises contacting an aryl halide with a tertiary-alkyl organometallic reagent (or the precursor components thereof) in the presence of a catalyst comprising a nickel compound and a coo... | 07/03/1990 |
