Die Kondensation der Crotyltrialkyl‐Sn‐Verbindungen (I) mit den Aldehyden (II) führt unabhängig von der Stereochemie der Crotyl‐Gruppe und von den Substituenten R2 der Aldehyde stereoselektiv ( 90%) zu den erythro‐β‐Methylhomoallylalkoholen (III).

flask was heated under nitrogen for 2 h at 160-170 °C (oil bath temperature), allowed to cool, and refrigerated overnight. The product was collected by filtration, washed successively with DMF, ethanol, and ether, and dried in vacuo to give 0.14 g (47%) of a yellow powder, mp > 300 °C. The analytical sample was prepared by recrystallization from DMF: IR (KBr) 3440,3385,3340, 2220, 1700 (br), 1665,1635,1600 cm"1. The compound was too insoluble in Me2SO or TFA for determination of its NMR spectrum.

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