Hydroalumination of 1-olefins with lithium aluminum hydride followed by treatment with 3-bromo-1-propyne in the presence of a catalytic amount of copper(I) chloride resulted in coupling. This new development provides a general method for the synthesis of terminal allenes.
Ameisensäure (I) reagiert mit Ethylgrignardverbindung (II) zu einem Salz (III), das mit den Grignardverbindungen (IV) über (V) bei der Hydrolyse die Aldehyde (VI) gibt.
Säurechloride (I) können mit Grignardverbindungen (II) in Tetrahydrofuran bei niedriger Temperatur (‐78°C) glatt zu den Ketonen (III) umgesetzt werden.
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