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 This page may be out of date.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.
Who discovered Copper? Copper is a metal which was known to people even during the pre historic times. Due to this reason we cannot say who discovered copper but evidence found by archaeologists propose that people living between the 5000 BC and 1200 BC may have discovered the metal. It was used by the ancients for making utensils, jewelery and weapons. Some historians consider that Romans were the first to use the metal on a large scale, some 11,000 years ago. Historians have also found evidence that copper was used in ancient India for making coins, lamps, idols and utensils.