The Fürst-Plattner rule describes a preference for trans-diaxial opening of suitable bridged intermediates on six-membered rings. A chair-like pathway generally avoids the unfavorable geometry of a competing twist/boat pathway; substrate fusion and substitution determine which route is accessible.
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The Fürst-Plattner Rule is a guideline used in mineral processing, particularly in the context of determining the viability of extracting metals from ore. It specifically relates to the extraction of silver from silver-bearing ores, although its principles can sometimes be applied to other metals as well. The rule suggests that the value of the metal that can be extracted must exceed the cost of recovering it, including expenses related to mining, milling, and refining the ore.