2. Alkene substitution
2.1 Historic first step: ethylene
In 1828, Zeise obtained a platinum compound that was formulated in a dualistic form for a very long time due to the lack of structural information: PtCl2 · KCl · C2H4. It took around 130 years for its structure to be established by X-ray diffraction. It is a potassium salt of the complex anion [PtCl3 (C2H4)]- in which the four PtCl3 atoms are in the same plane perpendicular to the axis of ethylene with two equal
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Alkene substitution
Alkyne substitution
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