Report - Reactivity of the Inversely Polarized Phosphaalkene HPC(NMe 2 ) 2 Toward Carbene Tungsten Complexes [(CO) 5 WC(R 1 )OR 2 ] (R 1 = c -C 3 H 5 , c -C 5 H 9 ; R 2 = Me, Et, Me 3 Si): 

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