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 This page may be out of date.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 the more expensive metal because of it's scarcity. Platinum makes up 0.005 parts per million of the earth's crust, and the majority of platinum mined is used as an â¦ industrial catalyst such as the catalytic converters in cars.Titanium is the 9th most abundant element in the earth's crust.latinum is the more expensive metal because of it's scarcity. Platinum makes up 0.005 parts per million of the earth's crust, and the majority of platinum mined is used as an â¦ industrial catalyst such as the catalytic converters in cars.