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Crystal structure of 2-bromo-3-di-methyl-amino-N,N,N',N',4-penta-methyl-4-(tri-methyl-sil-yloxy)pent-2-eneamidinium bromide.

ABSTRACT: The reaction of the ortho-amide 1,1,1-tris-(di-methyl-amino)-4-methyl-4-(tri-methyl-sil-yloxy)pent-2-yne with bromine in benzene, yields the title salt, C15H33BrN3OSi(+)·Br(-). The C-N bond lengths in the amidinium unit are 1.319 (6) and 1.333 (6) Å, indicating double-bond character, pointing towards charge delocalization within the NCN plane. The C-Br bond length of 1.926 (5) Å is characteristic for a C-Br single bond. Additionally, there is a bromine-bromine inter-action [3.229 (3) Å] present involving the anion and cation. In the crystal, weak C-H⋯Br inter-actions between the methyl H atoms of the cation and the bromide ions are present.

SUBMITTER: Tiritiris I

PROVIDER: S-EPMC4719979 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Crystal structures of 2-bromo-1,1,1,3,3,3-hexa-methyl-2-(tri-methyl-sil-yl)tris-ilane and 2-bromo-1,1,1,3,3,3-hexa-isopropyl-2-(triiso-propyl-sil-yl)tri-silane.

Project description:The synthesis and crystal structures of two tris-(tri-alkyl-sil-yl)silyl bromide compounds, C9H27BrSi4 (I, HypSiBr) and C27H63BrSi4 (II, TipSiBr), are described. Compound I was prepared in 85% yield by free-radical bromination of 1,1,1,3,3,3-hexa-methyl-2-(tri-methyl-sil-yl)tris-ilane using bromo-butane and 2,2'-azobis(2-methyl-propio-nitrile) as a radical initiator at 333 K. The mol-ecule possesses threefold rotational symmetry, with the central Si atom and the Br atom being located on the threefold rotation axis. The Si-Br bond distance is 2.2990 (12) Å and the Si-Si bond lengths are 2.3477 (8) Å. The Br-Si-Si bond angles are 104.83 (3)° and the Si-Si-Si bond angles are 113.69 (2)°, reflecting the steric hindrance inherent in the three tri-methyl-silyl groups attached to the central Si atom. Compound II was prepared in 55% yield by free-radical bromination of 1,1,1,3,3,3-hexa-isopropyl-2-(triiso-propyl-sil-yl)tris-ilane using N-bromo-succinimide and 2,2'-azobis(2-methyl-propio-nitrile) as a radical initiator at 353 K. Here the Si-Br bond length is 2.3185 (7) Å and the Si-Si bond lengths range from 2.443 (1) to 2.4628 (9) Å. The Br-Si-Si bond angles range from 98.44 (3) to 103.77 (3)°, indicating steric hindrance between the three triiso-propyl-silyl groups.

| S-EPMC6072994 | biostudies-literature

Crystal structure of ethyl 2-[(4-bromo-phen-yl)amino]-3,4-di-methyl-pent-3-enoate.

Project description:In the title compound, C15H20BrNO2, there are two independent mol-ecules (A and B) comprising the asymmetric unit and these adopt very similar conformations. In A, the dihedral angle between the CO2 and MeC=CMe2 groups is 80.7?(3)°, and these make dihedral angles of 3.5?(3) and 84.09?(16)°, respectively, with the bromo-benzene ring. The equivalent dihedral angles for mol-ecule B are 78.4?(3), 2.1?(3) and 78.37?(12)°, respectively. The most prominent inter-actions in the crystal packing are amine-N-H?O(carbon-yl) hydrogen bonds between the two independent mol-ecules, resulting in non-centrosymmetric ten-membered {?OC2NH}2 synthons. Statistical disorder is noted for each of the terminal methyl groups of the ethyl residues.

| S-EPMC4257164 | biostudies-literature

1-[(5-Bromo-pent-yloxy)meth-yl]pyrene.

Project description:In the title compound, C(22)H(21)BrO, other than the Br atom, the non-H atoms are approximately co-planar [maxium deviation = 0.178?(2)?Å] and the alk-oxy chain shows an all-anti conformation. A weak inter-molecular C-H?Br hydrogen bond contributes to the stabilization of the crystal structure.

| S-EPMC3120293 | biostudies-literature

Crystal structure of (1,3-di-tert-butyl-?(5)-cyclo-penta-dien-yl)tri-methyl-hafnium(IV).

Project description:The mol-ecule of the title organometallic hafnium(IV) com-pound, [Hf(CH3)3(C13H21)] or [HfMe3(?(5)-C5H3-1,3- (t) Bu2)], adopts the classical three-legged piano-stool geometry for mono-cyclo-penta-dienylhafnium(IV) derivatives with the three methyl groups bonded to the Hf(IV) atom at the legs. The C atoms of the two tert-butyl group bonded to the cyclo-penta-dienyl (Cp) ring are 0.132?(5) and 0.154?(6)?Å above the Cp least-squares plane. There are no significant inter-molecular inter-actions present between the mol-ecules in the crystal structure.

| S-EPMC4420044 | biostudies-literature

Crystal structures of 2,6-di-bromo-4-methyl-benzo-nitrile and 2,6-di-bromo-4-methyl-phenyl isocyanide.

Project description:In the title crystals, C8H5Br2N, which are isomorphous, the steric bulk of the methyl group causes neighboring mol-ecules to become mutually inclined. This prevents the formation of planar or nearly planar sheets, which were observed in the tri-chloro and tri-bromo analogs. Instead of CN/NC?Br contacts, tetra-meric Br?Br contacts are observed. These contacts form tetra-gonally puckered sheets parallel to (001). The CN/NC and methyl groups are grouped at the peaks and troughs. Both mol-ecules lie across crystallographic mirror planes; thus, the methyl H atoms are disordered over two sets of sites with equal occupancy. The title nitrile is a redetermination. The refinement converged at R[F2 > 2?(F2)] = 0.020, whereas the original determination [Gleason & Britton, (1976 ?). Cryst. Struct. Commun.5, 229-232] had R = 0.112.

| S-EPMC5730251 | biostudies-literature

Crystal structure of (1S,3R,8R,9S,10R)-10-bromo-methyl-2,2-di-chloro-9,10-ep-oxy-3,7,7-tri-methyl-tri-cyclo-[6.4.0.0(1,3)]dodeca-ne.

Project description:The title compound, C16H23BrCl2O, was synthesized in three steps from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzo-cyclo-heptene), which was isolated from the essential oil of the Atlas cedar (cedrus atlantica). The mol-ecule is built up from two fused six- and seven-membered rings, each linked to a three-membered ring. The six-membered ring has a screw-boat conformation, whereas the seven-membered ring displays a twist-boat conformation. The absolute structure was established unambiguously from anomalous dispersion effects.

| S-EPMC4420093 | biostudies-literature

Crystal structure of nitridobis(tri-methyl-silanolato)[1,1,1-trimethyl-N-(tri-methyl-sil-yl)silanaminato]molybdenum(VI).

Project description:In the title compound, [Mo(C6H18NSi2)(C3H9OSi)2N], the Mo(VI) cation is located on a mirror plane and is coordinated by a nitride anion, a 1,1,1-trimethyl-N-(tri-methyl-sil-yl)silanaminate anion and two tri-methyl-silanolate anions in a distorted tetra-hedral geometry; the N atom and two Si atoms of the 1,1,1-trimethyl-N-(tri-methyl-sil-yl)silanaminato anionic ligand are also located on the mirror plane. The Mo N bond length of 1.633?(6)?Å is much shorter than the Mo-N single-bond length of 1.934?(7)?Å. No hydrogen bonding is observed in the crystal structure.

| S-EPMC4719822 | biostudies-other

Synthesis and crystallographic characterization of [2,2-bis-(η5-penta-methyl-cyclo-penta-dien-yl)-3,4-bis(tri-methyl-sil-yl)-2-zircona-furan-5-one-κO5]triisobutyl-aluminium.

Project description:The crystal structure of the title zwitterionic zirconocene complex containing a furan-one unit, [AlZr(C10H15)2(C4H9)3(C9H18O2Si2)], is reported. On reacting a zircona-furan-one with two equivalents of HAl(i-Bu)2, disproportionation of the Lewis acid results in the formation of a triiso-butyl-aluminium fragment, Al(i-Bu)3, which coordinates to the exocyclic carbonyl O atom of the zircona-furan-one ring. Single-crystal X-ray diffraction reveals that the zircona-furan-one ring remains intact with coordination of the aluminium to the exocyclic O atom. One of the i-butyl groups is disordered over two sets of sites, with an occupancy ratio of 0.731 (3):0.269 (3).

| S-EPMC5946991 | biostudies-literature

Crystal structure of [1-(2,6-diiso-propyl-phen-yl)-2,4-bis-(di-methyl-amino)-5-tri-methyl-silyl-1,3,5-tri-aza-penta-dienyl-?(2) N (1),N (5)](tri-phenyl-phosphane-?P)copper(I).

Project description:The title complex, [Cu(C21H38N5Si)(C18H15P)], was obtained from the one-pot reaction between (Dipp)N(Li)SiMe3 (Dipp = 2,6-diiso-propyl-phen-yl), Me2NCN, CuCl and PPh3. The Cu(I) atom has a distorted trigonal-planar coordination sphere. The tri-aza-penta-dienyl ligand acts as a ?(2)-donor. The N-Cu-N bond angle is 95.88?(14)°. In the tri-aza-penta-dienyl fragment, the C-N bond lengths are in the range 1.328?(5)-1.349?(5)?Å, which indicates delocalization of the ?-electrons in the NCNCN system.

| S-EPMC4350696 | biostudies-literature

Crystal structures of di-aquadi-?-hydroxido-tris-[tri-methyl-tin(IV)] diformatotri-methyl-stannate(IV) and di-?-hydroxido-tris-[tri-methyl-tin(IV)] chloride monohydrate.

Project description:The title compounds, [Sn3(CH3)9(OH)2(H2O)2][Sn(CH3)3(CHO2)2] (1) and [Sn3(CH3)9(OH)2]Cl·H2O (2), are partially condensed products of hydrolysed tri-methyl-tin chloride. In the structures of 1 and 2, short cationic tris-tannatoxanes (C9H29O2Sn3) are bridged by a diformatotri-methyl-tin anion or a chloride anion, respectively. Hydrogen bridges are present and supposedly stabilize these structures against further polymerization to the known polymeric tri-methyl-tin hydroxide. Especially noteworthy is that the formate present in this structure was formed from atmospheric CO2.

| S-EPMC5050785 | biostudies-literature

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