Highly exfoliated montmorillonite (MMT) clay reinforced thermoplastic polyurethane elastomers (TPUs) were prepared by an in situ solution polymerization method.
A novel
heterogeneous catalyst, the ionic liquid (IL) of 1-butyl-3-methylimidazolium
acetate (BmimOAc) immobilized on MIL-101-NH2, denoted as
IL(OAc–)-MIL-101-NH2, was prepared by
the “ship-in-a-bottle” strategy. The IL of BmimOAc was
prepared in the MIL-101-NH2 nanocages primordially, in
which the condensation product of MIL-101-NH2’s
amine group with 1,1′-carbonyldiimidazole (CDI) reacted with
1-bromo butane, and then the intermediate exchanged with potassium
acetate. The structure and physicochemical properties of IL(OAc–)-MIL-101-NH2 were characterized by powder
X-ray diffraction, scanning electron microscopy, Fourier transform
infrared spectroscopy, DRS UV–vis, nitrogen adsorption–desorption,
and elemental analysis. The results indicated that BmimOAc was anchored
in the MIL-101-NH2 skeleton via the acylamino group and
confined in the nanocages in the form of a single molecule. The composite
material of IL(OAc–)-MIL-101-NH2 exhibited
excellent catalytic activity and catalytically synthesized 3-aryl-2-oxazolone
in an excellent yield of 92%. It can be reused up to six times without
noteworthy loss of its activity and demonstrated distinct size-selective
property for substrates. It was conjectured that the diffusion kinetics
of reactants could be controlled by the aperture size of the metal–organic
framework support.
The cover pictureshows two one-pot processes for the bioenzymatic synthesis of ethyl (R)-3-hydroxyglutarate (EHG), akey intermediate for the synthesis of rosuvastatin, from ethyl (S)-4-chloro-3-hydroxybutyrate (ECHB). In their Full Paper Q. Wu, D. Zhu and co-workersshow how in aone-pot two-step process the intermediate ethyl (R)-4-cyano-3-hydroxybutyate (HN)c an be synthesized by using Escherichia coli cells expressing ah alohydrin dehalogenase gene, followed by hydrolysis to EHG with Escherichia coli cells expressing an itrilase gene. The recombinant Escherichia coli cellsco-expressingh alohydrin dehalogenase and nitrilase genes can be used in aone-pot one-step process to produce EHG directly.The article highlighted by this cover can be found on p. 1438 ff.o fI ssue 9, 2015.The inside cover pictureshows the dry reforming of methane occurring on a nickel nanoparticle. In their Full Paper,Lee and co-workersdiscussthe bonding between the carbon intermediate and oxygen from the Al-Ce-Zr-O x support. Magnesium-promoted small nickel particles allow carbon to oxygen bonding. Oxygencan be regenerated through CO 2 reduction to CO. These phenomenahelp to suppress carbon formation and improvec atalytic activity.T he results show that the magnesium-promoted nickel/Ce-Al-Zr-O x catalyst forms small nickel particles, which are highly active and reduce carbon formation.
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