| DESCRIPTION | Co. IS TAKING a different tack to managing palladium, as well as phosphine, contamination--by using extremely low loadings of palladium and eliminating the ligand. This approach is based on the fact that the active form of palladium, Pd(0), tends to cluster and eventually precipitates. "A lot of people have observed this phenomenon. Halfway through a Suzuki, they get this black goo, and the reaction stops, Co. says. At a loading of 0.01 to 0.1 mol %, palladium will not precipitate and does not require a ligand. Co. has tested the low-loading method in a scale of several hundred grams. The technology is ready for commercial application, he adds |
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