Pyrolysis Kinetic Analysis of Sequential Extract Residues from Hefeng Subbituminous Coal Based on the Coats-Redfern Method.

Sequential extract residues (R , = 1, 2, 3, 4, and 5) were obtained from Hefeng acid-washing coal (HF) by petroleum ether, carbon disulfide, methanol, acetone, and isometric carbon disulfide/acetone mixture, sequentially. Pyrolysis behavior of the residues was determined using thermogravimetry analysis. The Coats-Redfern method with different reaction orders was used to analyze the pyrolysis kinetic of each sample, and the kinetic parameters, including correlation coefficient ( ), activation energy (), and pre-exponential factor (), were calculated.

Natural products-based insecticidal agents 6. Design, semisynthesis, and insecticidal activity of novel monomethyl phthalate derivatives of podophyllotoxin against Mythimna separata Walker in vivo.

To discover the more potent analogs, 12 novel monomethyl phthalate derivatives of podophyllotoxin were synthesized and preliminarily tested against the pre-third-instar larvae of Mythimna separata Walker in vivo at the concentration of 1mg/mL. Compounds 8e-i showed the higher insecticidal activity than podophyllotoxin. Especially 8g exhibited the most potent insecticidal activity compared with toosendanin, a commercially available insecticide derived from Melia azedarach.

(11,13-Dimethyl-1,4,7,10-tetra-azacyclo-trideca-10,13-dienato)copper(II) per-chlorate.

The title complex, [Cu(C(11)H(21)N(4))]ClO(4), comprises [Cu(II)(L)](+) (L = 11,13-dimethyl-1,4,7,10-tetra-azacyclo-trideca-10,12-dien-ate) cations and a perchlorate anion. The Cu atom is located on a twofold crystallographic symmetry axis and is coordinated by four N atoms in a slightly distorted square-planar geometry. Inter-molecular N-H⋯O hydrogen bonds are present.