Four types of nickel catalysts supported on aluminum oxide (Ni/Al2O3) with different nickel loadings were synthesized using the co-precipitation method and were used for the hydrogenation of levulinic acid (LA) to prepare γ-valerolactone (GVL). The synthesized Ni/Al2O3 catalysts exhibited excellent catalytic activity in dioxane, and the activity of the catalysts was excellent even after being u...

Chemical investigation of the marine sponge Plakortis cfr. lita afforded a library of endoperoxyketal polyketides, manadoperoxides B-K (3-5 and 7-13) and peroxyplakoric esters B(3) (6) and C (14). Eight of these metabolites are new compounds and some contain an unprecedented chlorine-bearing THF-type ring in the side chain. The library of endoperoxide derivatives was evaluated for in vitro acti...

The ultrasonic velocity, density and viscosity of some Schiff bases of 4-amino benzoic acid  were measured in 1,4-dioxane and dimethylformamide at 308.15 K. Various acoustical properties such as isentropic compressibility (ks), Rao’s molar sound function (Rm), the Van der Waals constant (b), molar compressibility (W), inter molecular free len...

The scientific objective of the research reported in this manuscript was the synthesis of novel phosphoramidite building blocks for the preparation of lipophilic oligonucleotides. Reaction of inosine (4) with 4-oxopentyl-4-methylbenzoate (2c) in the presence of triethyl orthoformate and 4M HCl in 1,4-dioxane gave a diastereoisomeric mixture of the ketals 5. Subsequent 4,4'-dimethoxytritylation ...

Iminopropadienones, RN=C=C=C=O, can be generated from four different types of precursors in flash vacuum thermolysis reactions: 1,3-dioxane-4,6-diones 1, isoxazolopyrimidinones 2, pyridopyrimidinium olates 3, and pyridopyrimidinones 4. 2,6-Difluorophenyl-, 2,6-diethylphenyl-, o-tert-butylphenyl-, and mesityliminopropadienone have been directly observed by Ar matrix IR spectroscopy in one or mor...

In the title compound, C(16)H(13)NO(4), the indole system is essentially planar, whereas the dioxane ring adopts a twist conformation. The mol-ecules are linked into chains by -O- H⋯O=C- hydrogen bonds and these chains are linked into rods by means of N-H⋯O hydrogen bonds. Exept for weak C-H⋯O inter-actions between the rods, no other inter-molecular contacts of inter-est are present.

IN THE CRYSTAL STRUCTURE OF THE TITLE COMPOUND [SYSTEMATIC NAME: 5H-dibenzo[a,d]cyclo-hepta-triene-5-carboxamide-1,4-dioxane (2/1)], 2C(16)H(13)NO·C(4)H(8)O(2), the cytenamide mol-ecules form a hydrogen-bonded R(2) (2)(8) dimer. The solvent mol-ecule is located between two adjacent cytenamide dimers and forms N-H⋯O hydrogen bonds with one cytenamide mol-ecule from each dimer.

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In the title compound, C(25)H(26)O(2), the dioxane ring adopts a chair conformation with the two substituent groups occupying equatorial positions.