Die Addition von Triäthylsilan (II) an 3,4‐Dimethyl‐pentin‐(l)‐ bzw. 3,4‐Dimethylhexin‐(1)‐diol‐(3,4), 3‐(1‐Hydroxycyclohexyl)‐ bzw. 3‐(1‐Hydroxycyclopentyl)‐butin‐(1)‐ol‐(3)(I) in Gegenwart von Hexachlorplatinsäure (0,1 m) in Isopropanol (Speier‐Katalysator) bei 90°C liefert die Verbindungen (III) in 20‐36%iger, die Verbindungen (IV) in 6 ‐ 9%iger Ausbeute, d.h. die Addition von (II) an (I) erfolgt überwiegend nach der Farmerschen Regel.
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