Rearrangements wonât occur if the initially formed carbocation is the most thermodynamically stable out of all the possible isomers. For example, if you use t-butyl bromide in a Friedel-Crafts alkylation, it will not rearrange, since the t-butyl c... This page may be out of date. Save your draft before refreshing this page.
Platinum was first used for minting coins in Spanish-colonized America. Following the discovery of platinum in gold rocks, the Spaniards were unable to use it for a long time because they had no technology for processing this metal.latinum was first used for minting coins in Spanish-colonized America. Following the discovery of platinum in gold rocks, the Spaniards were unable to use it for a long time because they had no technology for processing this metal.
Platinum is a rare metal. Unlike other minerals, platinum is largely concentrated around a single geographical location in South Africa; among total 14 million ounces of platinum produced in 2002, 57% was produced in South Africa, followed by 31% in Russia, and lesser amounts in the United States and Zimbabwe.hus the price and availability of platinum has a major impact on the driving force for transportation. In this report, current usage and production of platinum is reviewed, and a prospect of future platinum supply versus demand is discussed.