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 This page may be out of date.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 chemical element with the chemical symbol Pt and the atomic number of 78. Its name is derived from the Spanish term âplatina del Pintoâ, which is literally translated into âlittle silver of the Pinto Riverâ. It was discovered in South America by Ulloa in 1753 and by Wood in 1741.latinum also has 31 synthetic isotopes ranging in atomic mass from 166 to 202, making the total number of known isotopes 37. The least stable of these is 166 Pt with a half-life of 300 Âµs, while the most stable is 193 Pt with a half-life of 50 years.