“…[2] This sterically demanding endgroup places each polyyne a distance of Ͼ 8 Å from its nearest neighbor in the crystal lattice, double of that required for an intermolecular reaction to occur (Figure 2, b). [8,13] Diyne 3 shows a melting point (296-298°C) that is comparable to 1,4-bis(triphenylsilyl)-1,3-butadiyne (304°C) [14] and higher than that of 1,4-bis(methyldiphenylsilyl)-1,3-butadiyne (143°C). [13] These values are higher than those of trialkylsilyl-endcapped diynes such as 1,4-bis(TIPS)-1,3-butadiyne (98-100°C) [2] and 1,4-bis(TMS)-1,3-butadiyne (107°C).…”