Coordination complexes of bis(2,2-dimethyl-3,5-hexanedionato) zinc with organozinc-oxygen and -nitrogen compounds. Crystal structure of the complex formed with phenylzinc phenoxide

The crystal structure of 4-chloro-thiophenol, C6H5ClS

C6H5ClS, monoclinic, P21/n (no. 14), a = 5.7461(2) Å, b = 9.7601(4) Å, c = 5.7466(3) Å, β = 95.869(2)°, V = 320.59(2) Å3, Z = 2, R gt (F) = 0.0216, wR ref(F 2) = 0.0545, T = 200 K.

The crystal structure of 2,6-difluorophenol, C6H4F2O

C 6 H 4 F 2 O ${\text{C}}_{6}{\text{H}}_{4}{\text{F}}_{2}\text{O}$ , orthorhombic, P 2 1 2 1 2 1 $P{2}_{1}{2}_{1}{2}_{1}$ (no. 19), a = 4.9287(5) Å, b = 10.1752(8) Å, c = 10.9156(10) Å, V = 547.42(9) Å3, Z = 4, R g t ${R}_{gt}$ (F) = 0.0248, w R ref $w{R}_{\text{ref}}$ ( F 2 ${F}^{2}$ ) = 0.0705, T = 200 K.CCDC no.: 2025946

The crystal structure of 2,6-dimethyl-4-nitro-phenol, C8H9NO3

C8H9NO3, monoclinic, P21/n (no. 14), a = 6.9121(4) Å, b = 26.9700(15) Å, c = 8.7204(5) Å, β = 106.152(3)°, V = 1561.48(16) Å3, Z = 8, R gt (F) = 0.0486, wR ref (F 2) = 0.1399, T = 200 K.

The structure of ortho-(trifluoromethyl)phenol in comparison to its homologues – A combined experimental and theoretical study

The molecular and crystal structure of commercially-available ortho-(trifluoromethyl)phenol were determined by means of single-crystal X-ray diffractometry (XRD) and represent the first structural characterization of an ortho-substituted (trihalomethyl) phenol. The unexpected presence of a defined hydrate in the solid state was observed.Intermolecular contacts and hydrogen bonding were analyzed. The compound was further characterized by means of multi-nuclear nuclear magnetic resonance (NMR) spectroscopy (1H, 13C{1H}, 19F) and Fourier-Transform infrared (FT-IR) vibrational spectroscopy. To assess the bonding situation as well as potential reaction sites for reactions with nucleophiles and electrophiles in the compound by means of natural bonding orbital (NBO) analyses, and density functional theory (DFT) calculations were performed for the title compound as well as its homologous chlorine, bromine and iodine compounds. As far as possible, experimental data were correlated to DFT data.

Two tetranuclear zinc clusters, [Zn4(μ3-OEt)2(μ2-MalO)4Et2] and [Zn4(μ3-GueO)2(μ2-GueO)2(μ2-MalO)2(MalO)2]·2C7H8, containing defective dicubane core geometries (MalOH is maltol and GueOH is guethol)

The zinc alkoxide molecules in di-μ(3)-ethanolato-diethyltetrakis(μ(2)-2-methyl-4-oxo-4H-pyran-3-olato-κ(3)O(3),O(4):O(3))tetrazinc(II), [Zn(4)(C(2)H(5))(2)(C(2)H(5)O)(2)(C(6)H(5)O(3))(4)], (I), and bis(μ(3)-2-ethoxyphenolato-κ(4)O(1),O(2):O(1):O(1))bis(μ(2)-2-ethoxyphenolato-κ(3)O(1),O(2):O(1))bis(μ(2)-2-methyl-4-oxo-4H-pyran-3-olato-κ(3)O(3),O(4):O(3))bis(2-methyl-4-oxo-4H-pyran-3-olato-κ(2)O(3),O(4))tetrazinc(II) toluene disolvate, [Zn(4)(C(6)H(5)O(3))(4)(C(8)H(9)O(2))(4)]·2C(7)H(8), (II), lie on crystallographic centres of inversion. The asymmetric units of (I) and (II) contain half of the tetrameric unit and additionally one molecule of toluene for (II). The Zn(II) atoms are four- and six-coordinated in distorted tetrahedral and octahedral geometries for (I), and six-coordinated in a distorted octahedral environment for (II). The Zn(II) atoms in both compounds are arranged in a defect dicubane Zn(4)O(6) core structure composed of two EtZnO(3) tetrahedra and ZnO(6) octahedra for (I), and of four ZnO(6) octahedra for (II), sharing common corners. The maltolate ligands exist mostly in a μ(2)-bridging mode, while the guetholate ligands prefer a higher coordination mode and act as μ(3)- and μ(2)-bridges.

Stability, reactivity, solution, and solid-state structure of halomethylzinc alkoxides

In this paper, we report our findings regarding the development of a Lewis acid-catalyzed cyclopropanation of allylic alcohols with bis(iodomethyl)zinc. Iodomethylzinc alkoxides can be formed by treatment of an alcohol with bis(iodomethyl)zinc. These species are not prone to undergo cyclopropanation at low temperature but the addition of a Lewis acid in catalytic amounts induces the cyclopropanation reaction. Using this procedure, we demonstrated that the Lewis acid-catalyzed pathway significantly overwhelms the uncatalyzed one. This paper describes fundamental issues regarding the preparation and stability of halomethyl zinc alkoxides in solution as well as their aggregation state in solution and solid-state structures. Furthermore, the competition reaction between the inter- vs intramolecular cyclopropanation will be studied. Finally, we will discuss the possible activation pathways to explain the Lewis acid activation of halomethylzinc alkoxides. These findings provided new insights on the reactivity of ROZnCH(2)I and established the groundwork for the elaboration of an enantioselective version of the reaction.