Macropolyhedral boron-containing cluster chemistry. Nineteen-vertex [S2B17H17(SMe(2))]. An unusual apical boron atom of cluster connectivity six that introduces a new polyhedral borane building block

Mild thermolysis of [SB8H10(SMe(2))] results in the formation of a small amount of macropolyhedral [S2B17H17(SMe(2))] of which the structure is based on the fusion, with two boron atoms in common, of a conventional nido-type eleven-vertex {SB10H9} subcluster with an unprecedented arachno-type ten-vertex {SB9H8(SMe(2))} subcluster that exhibits an apical boron atom of cluster connectivity six.