Synthesis of end-cap precursor molecules for (6, 6) armchair and (9, 0) zig-zag single-walled carbon nanotubes

We report the synthesis and purification of a C60H30 precursor molecule for the end-cap of a (6, 6) armchair and of a C54H24 precursor molecule for a (9, 0) zig-zag type single-walled nanotube. An approach to controlled growth of single-walled carbon nanotubes is suggested.