Multiple choice

Which of the following metallacycles has the formula LnM(CH)4?

  1. Metallacyclobutanes

  2. Metallacyclopentadienes

  3. Metallacyclopentanes

  4. Metallabenzenes
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B Correct answer
Explanation

The parent metallacyclopentadiene has the formula LnM(CH)4. Most arise from the coupling of two alkynes at a low valent metal centres such as derivatives of Co(I) and Zr(II). Late metal derivatives (Co, Ni) are intermediates in the metal-catalysed trimerization of alkynes to arenes. For example, the zirconacyclopentadiene Cp2ZrC4Me4 is a useful carrier for C4Me4 2- .

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