1: 1-chloro-1-methyl-2,2-diphenylcyclopropane With 1,1-dimethylethylmagnesium chloride; iodine; magnesium in tetrahydrofuran T=65°C; Inert atmosphere; 2: chlorodi-tert-butylphosphine With copper(l) iodide; lithium bromide in tetrahydrofuran T=55°C; 6 h; Inert atmosphere;

1: 1-bromo-1-methyl-2,2-diphenylcyclopropane With magnesium; iodine in tetrahydrofuran T=40°C; 1 h; 2: chlorodi-tert-butylphosphine With copper(l) iodide; lithium bromide in tetrahydrofuran T=60°C; 3 h; Product distribution / selectivity;