Synthesis of Tris(2,5-dialkynylthieno)cyclotriynes, Tris(4,5-dialkoxyphenyl)cyclotriynes, and Tetrakis(4,5-dialkoxyphenyl)cyclotetraynes with Long-Chain Alkyl Substituents, and the Nickel and Cobalt Complexes of Tris[4,5-(didodecyloxy)phenyl]cyclotriyne