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Abstract
Starting from dihalophosphaalkenes Mes∗P=CHal2 (Hal = Cl, Br, I) we have been developing methodologies for the synthesis of (E)-Mes∗P=CHHal, which can be converted to reactive phosphaalkenyl metal reagents. Dibromophosphaalkene 1 was reacted with n-butyllithium at -120 °C, furnishing 2 after chlorination of the intermediate carbenoid. Compound 2 was transformed to the (E)-chlorophosphaalkene 3 as shown (SCHEME 1).