The highest yield of the product 3 was achieved in the case when the reaction mixture contained 4.2 % of Cu, introduced as a composite (Fig. ). On the other hand, in the reaction mixtures containing more than 5 % of Cu the yield was lower, than in the cases when there was less than 5 % of Cu (hereinafter percents mean mol. % of Cu relative to quantity of 1). Thus, there was no relation between the the yields of the product and the amount of copper in the reaction mixture. Moreover, the yield in the experimens with Cu-containign composites did not reach the values, previously found for the homogeneous systems containing CuCl2. Such observation can be an evidence that Cu was not completely "washed out" in the experiments; this issue will be considered below in more details.