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 This page may be out of date.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's catalytic properties have been known since the 1820s, when they were first discovered by German chemist Johann Wolfgang Doebereiner (dÃ¶bereinerâ1780). 1849 although platinum earned its name only in the 18th, century the platinum (metals and alloys rich in) platinum were known in ancient. timeslatinum's catalytic properties have been known since the 1820s, when they were first discovered by German chemist Johann Wolfgang Doebereiner (dÃ¶bereinerâ1780). 1849 although platinum earned its name only in the 18th, century the platinum (metals and alloys rich in) platinum were known in ancient. times