Crystal Structure Of Dimethyl Research Articles

Synthesis and Crystal Structure of Dimethyl{N-[(2-oxy-1-naphthyl)methylene]leucinato}silicon

The title compound was prepared by reaction of the Schiff base ligand N-(2-hydroxy-1-naphthylidene)leucine with dichlorodimethylsilane in the presence of triethylamine as base. The resulting pentacoordinate silicon complex was characterized by NMR, IR, UV-Vis spectroscopy and melting point. The structure was confirmed by single-crystal X-ray diffraction data. It crystallizes in the monoclinic space group Ic with unit cell dimensions a = 7.2030(6), b = 22.9842(14), c = 10.8946(12) Å, β = 96.141(7)°, V = 1793.3(3) Å3, Z = 4.

Crystal structure of dimethyl 3,3'-[(3-fluoro-phenyl)methyl-ene]bis-(1H-indole-2-carboxyl-ate).

In the title compound, C27H21FN2O4, the mean planes of the two indole ring systems (r.m.s. deviations = 0.0166 and 0.0086 Å) are approximately perpendic-ular to one another, making a dihedral angle of 87.8 (5)°; the fluorobenzene ring is twisted with respect to the mean planes of the two indole ring systems at 82.7 (5) and 85.5 (3)°. In the crystal, pairs of N-H⋯O hydrogen bonds link the mol-ecules into the inversion dimers, which are further linked by N-H⋯O hydrogen bonds into supra-molecular chains propagating along the b-axis direction. Weak C-H⋯π inter-actions are observed between neighbouring chains.

Crystal structure of dimethyl 3,3'-[(4-chloro-phen-yl)methyl-ene]bis-(1H-indole-2-carboxyl-ate).

In the title compound, C27H21ClN2O4, the mean planes of the two indole ring systems (r.m.s. deviations = 0.021 and 0.024 Å) are approximately perpendicular to one another, with a dihedral angle of 79.54 (12)°. The benzene ring is twisted with respect to the mean planes of the two indole ring systems at angles of 80.14 (15) and 86.30 (15)°. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds, forming inversion dimers with an R (2) 2(18) ring motif. The dimers are linked by a further N-H⋯O hydrogen bond, forming chains along [100]. There are intra- and inter-molecular C-H⋯π inter-actions present, the latter linking the chains to form a three-dimensional supra-molecular structure.

Dinuclear organotin(IV) complexes with bis-acyl-hydrazones containing flexible linker: Synthesis, spectroscopic investigation and crystal structure of dimethyl- and diphenyltin(IV) complexes with succinic dihydrazones

Four new dinuclear organotin(IV) complexes, (R2Sn)2La [R = Me (1), R = Ph (2)] and (R2Sn)2Lb [R = Me (3), R = Ph (4)], have been synthesized from the reaction of R2SnCl2 (R = Me or Ph) with bis(2-hydroxy-3-methoxybenzylidene)succinohydrazide (H4La) and bis(5-bromo-2-hydroxybenzylidene)succinohydrazide (H4Lb). The synthesized compounds have been investigated by elemental analysis, IR, 1H NMR, 13C NMR and 119Sn NMR spectroscopy. The results show the all complexes are dinuclear and two doubly deprotonated tridentate domain of the acyldihydrazone is coordinated to two SnR2 moieties via phenolic oxygen, imine nitrogen and enolic oxygen. The structures of 1 and 3 have been also confirmed by X-ray crystallography. Both complexes are centrosymmetry with the alkyl linker chain shows anti conformation. The intermolecular weak Sn⋯O bonds lead to 1D polymeric chain containing four-membered Sn2O2 planar rings. On the basis of 119Sn NMR data coordination number of tin is five in solution.

Crystal structure of dimethyl 1,4-dioxaspiro[4,5]dec-6-ene-(8R)-[(3,5- dinitrobenzoyl)oxa]-(2R,3R)-dicarboxylate, C19H18N2O12

Abstract C19H18N2O12, orthorhombic, P212121 (no. 19), a = 6.2472(6) Å, b = 17.576(2) Å, c = 18.848(3) Å, V = 2069.6 Å3, Z = 4, Rgt(F) = 0.0393, wRref(F2) = 0.0694, T = 210 K.

ChemInform Abstract: Reaction of N-Benzoyl-4,7-phenanthrolinium Salt with Trimethyl Phosphite and Crystal Structure of Dimethyl N,N′-Dibenzoyl-3,4,7,8- tetrahydro-4,7-phenanthroline-3,8-diphosphonate.

ChemInform Abstract: Reaction of N-Benzoyl-4,7-phenanthrolinium Salt with Trimethyl Phosphite and Crystal Structure of Dimethyl N,N′-Dibenzoyl-3,4,7,8- tetrahydro-4,7-phenanthroline-3,8-diphosphonate.

Crystal structure of the sulfonium salts of natural azulenes

The molecular and crystal structure of dimethyl-(1,4-dimethyl-7-ethylazulyl)-sulfonium perchlorate and dimethyl-(1,4-dimethyl-7-isopropylazulyl)-sulfonium perchlorate was determined by X-ray diffraction analysis. Their crystal structure is mainly determined by C-H...π intermolecular interactions.

Crystal Structure of Dimethyl 2-[(1,3-Dioxo-1,3-dihydro-2H-isoindol-2-yl)oxy]-2-butenedioate

The crystal structure of dimethyl 2-[(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)oxy]-2-butenedioate is monoclinic, space group P21/c with a = 7.9785(16), b = 24.801(6), c = 7.9550(16)A, β = 118.904(13)° and Z = 4. The crystal structure was solved by direct methods and refined by full-matrix least squares to final values of R1 = 0.0567 and wR2 = 0.0884 with 1927 reflections (I > 2 σ(I)).

Organometallic Diaza‐dimetalla‐Norbornanes and ‐Cyclohexanes of Aluminium, Gallium and Indium

AbstractSelective formation of 1,3,3,4,6,6‐hexamethyl‐1,4‐diaza‐3,6‐diinda‐norborane was achieved by the reaction of bis(lithiomethyl‐methylamino)methane with dimethylindium chloride by simultaneous formation of two dative metal‐carbon and two metal‐nitrogen bonds accompanied by two ring closures. The synthesis of heterometallic compounds of this type, namely 1,3,3,4,6,6‐hexamethyl‐3‐alumina‐1,4‐diaza‐6‐galla‐norborane [Me2AlCH2N(Me)]CH2[N(Me)CH2GaMe2], was also attempted by the reaction of bis(lithiomethyl‐methylamino)methane with dimethylaluminium and ‐gallium chloride. This compound is formed, but cannot be separated from the simultaneously formed homometallic compounds [Me2MCH2N(Me)]2CH2(M = Al, Ga). The compounds were identified by elemental analyses, mass spectra, NMR spectroscopy (1H, 13C), and by determination of their crystal structures in which they are present as monomers. The norbornane‐like structure is favoured over potential isomers containing three‐membered rings and over polymeric aggregation in both compounds. In addition, the crystal structure of dimethyl(dimethylaminomethyl)indium was determined by single crystal X‐ray diffraction, which shows an intermolecular aggregation into a six‐membered ring dimer.

On the influence of the heterocyclic ring substituents on the structure of dimethylthallium pyrimidine-2-thionato complexes. Crystal structure of dimethyl-(4-trifluoromethylpyrimidine-2-thionate)thallium(III): a compound with intermolecular C–H ⋯ π interactions

The complex [Me 2Tl(4-CF 3pymS)] has been prepared by reacting 4-trifluoromethylpyrimidine-2-thione (4-CF 3pymSH) with dimethylthallium(III) hydroxide in methanol. The resulting compound has a polymeric chain structure, with the thallium atom coordinated by two nitrogen and two sulfur atoms from two different ligands, which act as bridges between two metal atoms, as well as by two carbon atoms of the methyl groups. An intermolecular C–H ⋯ π interaction is observed between an H atom of each methyl group and one of the pyrimidine rings of the neighbouring chain. The structure of the complex is discussed in terms of the IR absorptions, the 1H, 13C and 205Tl NMR spectra and FAB data.

ChemInform Abstract: Synthesis and Crystal Structure of Dimethyl 2‐Benzoyl‐2‐ethyl‐3‐phenylcyclopropane‐1,1‐dicarboxylate.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Diorganotin(IV) derivatives of salicylaldehydethiosemicarbazone. The crystal structure of dimethyl- and diphenyl- (salicylaldehydethiosemicarbazonato)tin(IV)

The title compounds have been prepared by reacting the corresponding diorganotin(IV) oxide with salicylaldehyde thiosemicarbazone (H 2L). [SnMe 2(L)] crystallizes in the monoclinic space group P2 1/ n with a=9.480(3), b=13.532(7), c=10.541(3) Å, β=100.33(2)° and Z=4 ( R=0.0230, R′=0.0258). [SnPh 2(L)] crystallizes in the space group P2 1/ a with a=13.483(8), b=10.078(1), c=15.622(4) Å, β=113.66(4)° and Z=4 ( R=0.030, R′=0.031). Both complexes consist of molecules in which the bisdeprotonated ligand is O,N,S-bonded and the tin atom exhibits distorted pentacoordination, with small differences between the methyl and phenyl derivatives in bond distances, bond angles and intermolecular hydrogen bonds. The spectral properties of the complexes (IR, Mössbauer and 1H, 13C and 119Sn NMR spectra) are discussed in the light of this structural information.

ChemInform Abstract: Chemical Shift Non‐Equivalence in the NMR Spectroscopy of Dialkyl . alpha.‐Hydroxybenzyl‐ and Dialkyl α‐Methoxybenzylphosphonates and the Crystal Structure of Dimethyl α‐Chloromethyl‐α‐ hydroxybenzylphosphonate.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Reaction of N-Benzoyl-4,7-phenanthrolinium Salt with Trimethyl Phosphite and Crystal Structure of Dimethyl N,N'-Dibenzoyl-3,4,7,8-tetrahydro-4,7-phenanthroline-3,8-diphosphonate

The reaction of 4,7-phenanthroline (1) with some susbtituted benzoyl chloride and trimethyl phosphite in the presence of sodium iodide gave the corresponding α,α'-diphosphonates, α,γ'-diphosphonates, α-phosphonates, and γ-phosphonates respectively. 3,8-Diphosphonates (2a 1 , 2a 2 ) were separated by thin layer chromatography and the crystal structure of 2a 2 was determined by X-ray analysis

Mono-organomercury and diorganothallium derivatives of rhodanine: Crystal structure of dimethyl(rhodaninato)thallium(III)

The complexes HgR(Rd) and TIR 2(Rd) (R = Me, Ph; HRd = rhodanine) have been prepared from the reaction of the ligand with the appropriate organometallic hydroxide (Tl) or acetate (Hg). The crystal structure of TlMe 2(Rd) was obtained and shows that the thallium atom is coordinated by two oxygen atoms and a sulphur atom from three different ligands, as well as the two carbon atoms of the methyl groups. The compound crystallizes, forming a planar association along the plane defined by the crystallographic axes ac. Comparison of this compound with TlPh 2(Rd) and HgR(Rd) was undertaken using mass, IR, and multinuclear ( 1H, 13C, 199Hg, 205Tl) NMR spectra.

ChemInform Abstract: Reissert‐Type Reaction of N‐Sulfonyl‐ or N‐Acylphthalazinium Salts with Trimethyl Phosphite and Crystal Structure of Dimethyl 2‐Mesyl‐1,2‐dihydro‐1‐phthalazinylphosphonate.

AbstractThe phthalazinium salts mentioned in the title are obtained as intermediates by treatment of phthalazine (I) with the acyl (II) or sulfonyl chlorides (V) and trimethyl phosphite (III).