benzene in benzene Kinetics; byproducts: C6H5CD2(CH2)2C6H5; at 170°C; monitoring by 1H NMR;

catalyst: dioxane-d8 in 1,4-dioxane-d8; perdeuterocyclohexane Kinetics; Cr-complex was heated in C6D12 in the presence of dioxane-d8 (4.0 M) at 170°C; rate consts. for external arene exchange are given; (1)H NMR analysis of reaction mixt.;