Crystals of three new intermetallic compounds were grown from reactions of ruthenium with other elements in La0.8Ni0.2 eutectic flux. The new boride LaRU2Al2B crystallizes in a filled CeMg2Si2 structure type (P4/mmm, a = 4.2105(5) angstrom, c = 5.6613(8); Z= 1, R-1 = 0.014), with Ru atoms forming a planar square net; B atoms center alternating Ru squares, which is an unusual coordination of boron by transition metals. Al atoms connect the RU2B layers, forming large voids where La ions reside. The chemical bonding analysis using the electron localization function (ELF) reveals two-center covalent bonding between Al atoms, an absence of direct Ru-Ru interactions, and three-centered bonds between Ru and B or Al atoms, The band structure calculation shows LaRU2Al2B to be metallic, which is in agreement with the observed temperature independent paramagnetism and heat capacity data. The crystal structure of La2Ni2-xRuxAl (HT-Pr2Co2Al-type; x = 0.21 (1) and x = 0.76(1); C2/c, a = 9.9001(3) angstrom, b = 5.7353(1) angstrom, c = 7.8452(2) angstrom, beta = 104.275(1); Z = 4, R-1 = 0.016 for x = 0.76(1)) features infinite [Ni2-xRuxAl] spiral-twisted chains composed of Al2M2-rhombic units (M = Ni/Ru) seen in many La-Ni-Al intermetallics. The structure of La6SnNi3.67RU0.76Al3.6 (Nd6Co5Ge2.2-type; P (6) over bar m2, a = 9.620(1) angstrom, c = 4.2767(9) angstrom; Z = 1, R-1 = 0.015) is composed of a three-dimensional [Ni3.67RU0.76Al3.6](infinity)(3) network with large hexagonal channels accommodating interconnected tin-centered lanthanum clusters Sn@La-9.