New bifunctional silazanes and their condensation reactions: 3-Methyl-2,2,4,4-tetrakis(methylamino)-1-phenyl-[1,3,2,4]diazadisiletidine, 1,3-dichloro-2-phenyl-1, 1,3,3-tetrakis(dimethylamino)disilazane, 3-methyl-2,2,4,4-tetrakis(dimethylamino)-1-phenyl-[1,3,2,4]diazadisiletidine and 2,2,4,4-tetrakis(dimethylamino)-1-phenyl-[1,3,2,4]diazadisiletidine

3-Methyl-2,2,4,4-tetrakis(methylamino)-1-phenyl- [1,3,2,4]diazadisiletidine (1), 1,3-Dichloro-2-phenyl-1,1,3,3-tetrakis(dimethylamino)disilazane (2), 3-Methyl-2,2,4,4-tetrakis (dimethylamino)-1-phenyl-[1,3,2,4]diazadisiletidine (3) and 2,2,4,4-Tetrakis(dimethylamino)-1-phenyl-[1,3,2,4]diazadisiletidine (4) have been synthesized as potential precursors for the preparation of porous oxygen-free solids. All compounds were characterized by crystal structure 109.4(1)degrees and Z = 4 (R-1 = 8.7%, wR(2) = 20.7%, 1545 independent reflections). 2 crystallizes triclinically, P (1) over bar, a = 8.011(2), b = 8.424(2), c = 16.082(2) Angstrom, alpha = 91.08(1)degrees, beta = 93.89(1)degrees, gamma = 105.71 (1)degrees and Z = 2 (R-1 = 3.0%, wR(2) = 7.9%, 3657 independent reflections). 3 crystallizes monoclinically, P2(1)/c, a 29.746(2), b = 21.590(2), c = 13.331(2) Angstrom, beta = 102.95(1)degrees and Z = 16 (R-1 = 4.3%, wR(2) = 9.3%, 6667 independent reflections). 4 crystallizes triclinically, P (1) over bar, a = 10.450(1), b = 10.467(1), c = 17.948(1) Angstrom, alpha = 97.43(1)degrees, beta = 98.73(1)degrees, gamma = 90.08(1)degrees and Z = 4 (R-1 = 10.2%, wR(2) = 25.8%, 3586 independent reflections). Polycondensation of 1 and ammonolysis and polycondensation of 2 yield amorphous solids with different porosities.