“…Prolonged treatment with FeCl 3 Á 6H 2 O results in oxidative cluster closure of the four pyridine based complexes, which gives the neutral closo ten-vertex monocarbaboranes [1-Ph-6-L-closo-1-CB 9 H 8 ]. 45 The anion [closo-1-CB 9 H 8 -1-COOH-10-I] À has been prepared in four steps from B 10 H 14 . The carboxylic acid is readily converted to the amine [closo-1-CB 9 H 8 -1-NH 2 -10-I] À using the Curtius reaction.…”