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 This page may be out of date.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 wedding ring. The metal platinum is a more expensive metal than gold as itâs a more rare metal and there are difficulties involved with mining it, which also adds to its price. Platinum is also used in a much higher concentrations in jewelry than the proportion of gold used in jewelry. The platinum alloy used in jewelry consists of 85% to 95% platinum, thatâs 850 to 950 parts platinum for every thousand parts.