la the studies of new mesogen compounds featuring an enyne rigid core, three molecular structures were analyzed by X-ray. Two of them are presented here: 1) 1,4-di(octaoxyaryl)-1-buten-3-yne, [(C8H17)O(C6H4)CHCHCC(C6H4)O(C8H17)], monoclinic crystal system, Pa space group, a = 6.193(2)angstrom, b = 7.381(2)angstrom, c = 31.783(10)angstrom, beta = 94.87(3)degrees, Z = 2, R1 = 0.0659, wR2 = 0.1738; and 2) 1,4-di(decaoxyaryl)-1-buten-3-yne [(C10H21)O(C6H4)CHCHCC(C6H4)O(C10H21)], monoclinic crystal system, Pa space group, a = 6.108(2)angstrom, b = 7.38.5(4)angstrom, c = 36.391(16)angstrom, beta = 91.64(3), Z = 2, R1 = 0.0752, and wR2 = 0.1832.