DEPROTONATION OF ALLYLBENZENE CHROMIUMTRI CARBONYL IN ALKALINE-SOLUTION - H-1 AND C-13 NMR AND REACTIVITY OF ALLYL ANIONS - ELECTRON AND STERIC BEHAVIOR OF THE CHROMIUMTRICARBONYL GROUP

H-1 and C-13 NMR study of allylic anions obtained in basic media from allylbenzene Cr(CO)3 and propenylbenzene Cr(CO)3 or [Cr(CO)3]2 is repo rted. A comparison with uncomplexed anions literature results allows t o specify the structure of the anion and the electronic effect of the Cr(CO)3 group. About NMR study of the diarylpropenide anions Cr(CO)3 o r [Cr(CO)3]2 suggests that a Cr(CO)3 group migrates toward the allylic system. Finally the addition of RX derivatives on these anions is rep orted.