Inheritance of chlorantraniliprole resistance and fitness costs in a field population of Cnaphalocrocis medinalis (Lepidoptera: Pyralidae) in China.

Background: Cnaphalocrocis medinalis is one of the major rice insect pests in Asia. Chlorantraniliprole is one of the most important insecticides for the control of C. medinalis.

Rhodium-Catalyzed Regioselective Formal Hydroacylation of Vinyl Epoxides toward Esters Involving β-Carbon Cleavage.

Herein we disclose the first example of the formal hydroacylation reactions of vinyl epoxides with chelating aldehydes enabled by rhodium catalysis for the efficient construction of functionalized esters. Detailed investigations of the mechanistic pathway reveal that the presence of a 2-vinyl group is essential in contributing to the success of this regioselective reaction, which might proceed through β-carbon cleavage as the key procedure.

The synthesis of ,'-disulfanediyl-bis('-(()-benzylidene)acetohydrazide) from ()-'-benzylideneacetohydrazide and S.

Herein we report an oxidative coupling reaction for N-S/S-S bond formation from ()-'-benzylideneacetohydrazide and S to furnish substituted ,'-disulfanediyl-bis('-(()-benzylidene) acetohydrazide). It provides a direct approach for the synthesis of disulfides with good yields.

Rhodium-Catalyzed Ring-Opening Hydroacylation of Alkylidenecyclopropanes with Chelating Aldehydes for the Synthesis of γ,δ-Unsaturated Ketones.

The first intermolecular ring-opening hydroacylation of alkylidenecyclopropanes with chelating aldehydes through a rhodium-catalyzed acrylamide-promoted protocol is reported. This highly efficient catalytic system enables the direct synthesis of a diverse range of linear γ,δ-unsaturated ketones. Good functional group compatibility is demonstrated for the completely atom-economical and remarkably selective proximal C-C bond cleavage process.

Combination of PhI(OAc) and 2-Nitropropane as the Source of Methyl Radical in Room-Temperature Metal-Free Oxidative Decarboxylation/Cyclization: Construction of 6-Methyl Phenanthridines and 1-Methyl Isoquinolines.

A room-temperature metal-free method for generating highly unstable methyl radical was realized from the combination of PhI(OAc) and 2-nitropropane, which provides an efficient approach to methylated phenanthridines and isoquinolines. The strategy was also extended to the generation of other alkyl radicals and a concise synthesis of Roxadustat.

Rhodium-Catalyzed Synthesis of α,β-Unsaturated Ketones through Sequential C-C Coupling and Redox Isomerization.

A novel Rh(I)-catalyzed sequential C-C coupling and redox isomerization between allylic alcohols and 1,3-dienes has been accomplished. This versatile protocol provides expeditious access to a broad range of polysubstituted α,β-unsaturated ketones with excellent atom economy and regioselectivity.

Silver-catalyzed C2-selective direct alkylation of heteroarenes with tertiary cycloalkanols.

A silver-catalyzed regioselective C2-alkylation of heteroarenes with tertiary cycloalkanols under radical conditions was developed. This tandem process, which includes selective C-H activation, C(sp)-C(sp) bond cleavage, and C(sp)-C(sp) bond formation, affords a novel and environmentally friendly approach for the production of carbonyl-containing alkyl-substituted heteroarenes with moderate to good yields.

Copper/silver-mediated cascade reactions for the construction of 2-sulfonylbenzo[b]furans from trans-2-hydroxycinnamic acids and sodium sulfinates.

Efficient construction of 2-sulfonylbenzo[b]furans is achieved from readily available trans-2-hydroxycinnamic acids and sodium sulfinates mediated by the CuCl2·2H2O/AgTFA system under mild conditions. This unprecedented synthetic protocol provides expedient access to a series of products in one step via a protodecarboxylation/C-S bond formation/C-O bond formation cascade.

[Size distributions and diurnal variations in the concentrations of polycyclic aromatic hydrocarbons in winter in urban and suburban Nanjing, China].

The contamination status and distribution characteristics of particulate polycyclic aromatic hydrocarbons (PAHs) were investigated in aerosols of urban and suburban Nanjing. A total of 17 PAHs were analyzed in the aerosol samples collected in daytime and nighttime during January 1st to 10th, 2010 in Nanjing University (NU) and Nanjing University of Information Science & Technology (NUIST). The PAH concentrations at the urban and suburban sites were 41.

[Analysis of arterial spin labeling in 33 patients with hypoxic ischemic encephalopathy].

Objectives: To evaluate the diagnostic value of arterial spin labeling (ASL) technology in newborns with hypoxic ischemic encephalopathy (HIE).

Method: Seven full-term newborn infants without any history of asphyxia and other nervous system diseases were selected as the control and 33 full-term newborn infants were assigned into HIE group. The patients in HIE group were further divided into three subgroups (19 cases of mild, 6 cases of moderate and 8 cases of severe HIE) based on their clinical diagnosis.

[Influence of inorganic additives on the distribution of polycyclic aromatic hydrocarbons in the smoke and ash from mosquito coils burning].

The influence of inorganic additives (NaCl, Na2CO3 and CaCO3) on the distribution of polycyclic aromatic hydrocarbons (PAHs) in the smoke and ash from mosquito coils burning was studied, GC-MS technique was applied to analyze the contents of 16 priority-controlled PAHs recommended by US EPA. The results show that 16 priority-controlled PAHs are detected in the smoke of mosquito coil without additives, characterized by the predominance of 2- to 3-ring PAHs, which are ranked as NaP (3.109 microg x g(-1)) > Phe (1.

[Size distribution characteristics of polycyclic aromatic hydrocarbons of PM10 in foggy days in the north suburb of Nanjing].

Based on meteorological data and aerosol samples from Nov.15 to Dec.30,2007 in the north suburb of Nanjing, size distribution characteristics of polycyclic aromatic hydrocarbons (PAHs) in PM10 in foggy and sunny days were studied, and the concentrations of 16 PAHs were analyzed by gas chromatography with mass selective detection (GC-MS).

[Transformation of Populus tomentosa with anti-PLD gene].

Antisense Phospholipase Dgamma( PLDgamma) gene was introduced into Populus tomentosa mediated by Agrobactrium tumefaciens. The young leaves of triploid populus were used as the material and the regeneration system of high frequency has been established. We have developed the traditional transgene method by Agrobactrium trmefaciens and obtained many transgenic plants of anti-PLDgamma gene.