in tetrahydrofuran byproducts: Mn2(CO)10; KMn(CO)5 in THF was added dropwise to stirred soln. of allyl halide (3-fold excess) in THF under N2;; evapd. in vac., addn. of pentane, filtered through Celite, cooled to -78 °C, crystals of Mn(CO)5Br were syringed off; approx. 90percent purity, contaminated;;