Zhen-Hua Shang

Bio: Zhen-Hua Shang is an academic researcher from Hebei University of Science and Technology. The author has contributed to research in topics: Hydrogen bond & Dihedral angle. The author has an hindex of 3, co-authored 15 publications receiving 30 citations.

N′-(4-Methoxybenzylidene)methoxyformohydrazide

Abstract: There are two mol­ecules in the asymmetric unit of the title compound, C10H12N2O3, with almost identical conformations. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds.

Methyl 6-methyl-2-oxo-4-(3,4,5-trimethoxyphenyl)-1,2,3,4-tetrahydropyrimidine-5-carboxylate

Abstract: The title compound, C16H20N2O6, was synthesized from 3,4,5-trimethoxy­benzaldehyde, methyl 3-oxobutanoate and urea in acetonitrile catalysed by Bi(NO3)3. The tetra­hydro­pyrimidin-2-one ring is twisted and two mol­ecules are connected by N—H⋯O hydrogen bonds.

Methyl 4‐(4‐hydroxy‐3‐methoxyphenyl)‐6‐methyl‐2‐thioxo‐1,2,3,4‐tetrahydropyrimidine‐5‐carboxylate

Abstract: Atwal, K. S., Rovnyak, G. C., O’Reilly, B. C. & Schwartz, J. (1989). J. Org. Chem. 54, 5898–5907. Atwal, K. S., Swanson, B. N., Unger, S. E., Floyd, D. M., Moreland, S., Hedberg, A. & O’Reilly, B. C. (1991). J. Med. Chem. 34, 806–811. Bruker (1997). SADABS, SMART, SAINT and SHELXTL. Bruker AXS Inc., Madison, Wisconsin, USA. Kappe, C. O. (1993). Tetrahedron, 49, 6937–6963. Kappe, C. O. & Fabian, W. M. F. (1997). Tetrahedron, 53, 2803–2816. Rovnyak, G. C., Atwal, K. S., Hedberg, A., Kimball, S. D., Moreland, S., Gougoutas, J. Z., O’Reilly, B. C., Schwartz, J. & Malley, M. F. (1992). J. Med. Chem. 35, 3254–3263. Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Göttingen, Germany. organic compounds

Oil-resisting sealing protection composition adapted for various rubber sealing member on cannon

Abstract: The invention relates to an oil-resistant sealing protection constituent which applies to a variety of rubber seals on an artillery, and comprises base oil, thickening agent, plasticizer, oil-soluble corrosion inhibitor and antioxidant, and the oil-resistant sealing protection constituent has good compatibility with various oil and rubber seal on the artillery, and the oil-resistant sealing protection constituent is dotted on the surface of the artillery, the property of various oil on the artillery are not affected, but produces the following beneficial effects: first, oil-resistant sealing protection constituent can form a dense layer of protective film on the surface of the rubber seals, which prevents the oil and various oxide materials on the artillery infiltrating to the rubber seals, thus slowing the rubber seals aging and failure rate, and extending its service life; second, rubber seals can make up for the lack of rubber seal materials, and enhance the effect of sealing; third, the oil-resistant sealing protection constituent has some protective properties, which can protect the metal components of the use parts, thereby the use of the oil-resistant sealing protection constituent has a good role on reducing the failure rate of the artillery, and reducing the workload of artillery maintenance, and extending the life of the equipment

4-[(4-Chlorophenyl)iminomethyl]-2-methoxyphenol

Abstract: The title compound, C14H12ClNO2,was prepared from 4-hydr­oxy-3-methoxy­benzaldehyde and 4-chloro­phenyl­amine. The two aromatic substituents lie trans to each other across the C=N bond, with a dihedral angle of 44.40 (8)° between the two rings

Effect of substitution on molecular conformation and packing features in a series of aryl substituted ethyl-6-methyl-4-phenyl-2-thioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylates

Abstract: The supramolecular structures of eight aryl protected ethyl-6-methyl-4-phenyl-2-thioxo-1,2,3,4 tetrahydropyrimidine-5-carboxyl ates were analyzed in order to understand the effect of variations in functional groups on molecular geometry, conformation and packing of molecules in the crystalline lattice. It is observed that the existence of a short intra-molecular C-H center dot center dot center dot pi interaction between the aromatic hydrogen of the aryl ring with the isolated double bond of the six-membered tetrahydropyrimidine ring is a key feature which imparts additional stability to the molecular conformation in the solid state. The compounds pack via the cooperative involvement of both N-H center dot center dot center dot S=C and N-H center dot center dot center dot O=C intermolecular dimers forming a sheet like structure. In addition, weak C-H center dot center dot center dot O and C-H center dot center dot center dot pi intermolecular interactions provide additional stability to the crystal packing.