21. N-Phenylhydroxylamines are typically synthesized from nitrobenzenes by reduction using rhodium or zinc. 22. Rhodium ( II ) carboxylate complexes are easily prepared and indefinitely stable in air.23. Rhodium typically occupies oxidation states + I or + III in its stable compounds.24. They demonstrate that rhodium sandwich compounds can be prepared from half-sandwich precursors. 25. Rhodium catalyzed synthesis of TEMPO containing polymers has been performed with high quantitative yield.26. The price of rhodium is highly variable. 27. Other noble metal-containing complexes used include ones with platinum, rhodium and iridium. 28. It can contain osmium, rhodium , iridium, and iron substituting for the ruthenium. 29. Analyses typically show minor amounts of rhodium . 30. The citation highlights his work on the platinum group metals palladium, rhodium and iridium.