Synthesis of Layered Hydroxide Zinc m‐Aminobenzoate Compounds and Their Exfoliation Reactions

Abstract

Two types of layered hydroxide zinc m-aminobenzoate compounds with structures of layered basic metal salt (LBMS) were prepared by the reaction of zinc hydroxide with m-aminobenzoic acid solution in the temperature range of 40-120 ℃. The formation reactions, structures, chemical compositions, and exfoliation reactions of the layered compounds in alcohol solvents were investigated by XRD, TG-DTA, SEM, and TEM. One layered phase with a basal spacing of 1.08 nm has a α-Ni(OH) 2 -like structure, and its chemical formula can be written as Zn(OH) 0.67 (m-NH 2 C 6 H 4 COO) 1.33 . This phase has strip-like particle morphology and cannot be exfoliated into its nanosheets in alcohol solvents. The other layered phase with a basal spacing of 2.66 nm has a zinc hydroxide-nitrate-like structure, and can be exfoliated in alcohol solvents.

The Renaissance of α‐Methylene‐γ‐butyrolactones: New Synthetic Approaches

“…[77] They submitted racemic g-hydroxy esters rac-101, to enzyme- In 2002, Wang and Zhao reported the preparation of optically active b-alkyl-a-methylene-g-butyrolactones by the enantioselective biotransformation of nitriles. [78] They studied the enantioselective hydrolysis of the readily available nitriles 104 catalyzed by Rhodococcus sp. AJ270 whole cells, a powerful nitrile hydratase/amidase-containing microorganism.…”

Zn2Al Layered Double Hydroxides Intercalated with Nitrate and p-Aminobenzoate as Ultraviolet Protective Agents in Low-Density Polyethylene Nanocomposites and Natural Insulating Oils

“…16,21,23 Many works investigating zinc LHSs interacting with the p-AB intercalated anions (and similar species) have been published. [24][25][26][27] However, here we paid particular attention to the results of Conterosito et al 28 who reported that when p-AB anions are intercalated in zinc LDHs, they coordinate to the metal site through a covalent bond with no need of heating the system, as would be expected. This model suggests that the p-AB anions are not in an interdigitated arrangement as other researchers have claimed, but in such a way that the ions of the lower layer interact with other ions of the lower layer through π-π forces, and with the ions of the upper layer with H-bonds in a N-H•••N network.…”

“…Many papers 10,14,16,[23][24][25] have been published regarding the structure of LDHs intercalated with p-AB anions, and the discussion is of great interest. In general, LDHs interact with the intercalated ions through electrostatic van der Waals forces (a negatively charged ion with a positively charged layer), involving no formation of chemical bonds, but only the physisorption of the guest species onto the layer.…”

Enantioselective Biotransformations of Nitriles

“…Biotransformations of the Baylis-Hillman nitriles [27] and its one carbon homologated nitriles [28], for example, give only moderate enantioselectivity. With the exception of b-vinyl-b-phenylpropanenitrile [22] as we discussed in the previous section (Table 3)…”