in not given reaction mechanism discussed;;

potassium tert-butylate in dimethyl sulfoxide T=38°C; 1 h;

1: (i) 1-chloro-pentane, Na, pentane, decalin (ii) /BRN= 1900390/ View Scheme

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;