Addition von Organomagnesiumhalogeniden an C = C‐Bindungen, XVI. Notiz über eine Chrysanthemsäure‐Synthese

Addition of Organomagnesium Halides to C = C Bonds, XVI 1) . — A Synthetic Route to Chrysanthemic Acid Addition of 1‐isobutenylmagnesium bromide ( 4 ) to 3,3‐dimethylcyclopropene leads to the formation of a 1:1 product as well as considerable amounts of 1:2, 1:3, and higher molecular adducts. Further reaction with carbon dioxide gives, after hydrolysis, a mixture of cis ‐chrysanthemic acid (6; 39%) and the higher molecular acids 1 and 2 .