Iron(ii)-catalyzed sulfur directed C(sp)-H bond amination/C-S cross coupling reaction.

An efficient iron(ii)-catalyzed sulfur directed C(sp)-H bond amination/C-S cross coupling reaction has been developed. The reaction had high tolerance of functional groups under moderate conditions. The results of a deuterium labeling study and in situ ESI-MS experiments indicated that the reaction mechanism probably corresponds to a Fe(ii)/Fe(iii) catalytic cycle.

A new friedelane type triterpene from Euonymus hederaceus.

Euonymus hederaceus is distributed widely in the south of China; its stems and leaves have been used as folk medicines to treat many diseases such as renal deficiency and chronic diarrhea, traumatic injury, and abnormal menstruation. Chemical investigation of the leaves and stems of Euonymus hederaceus resulted in the isolation forthe first time and characterization of a new friedelane type triterpene with a molecular mass of 472 and molecular formula of C(30)H(48)O(4)by high resolution mass spectrometry. The (1)H-NMR (13)C-NMR and DEPT135(0)spectra matched the characteristic data of the proposed triterpene skeleton.

[Determination of trace elements in radix Paeoniae alba by microwave digestion-ICP-AES].

Microwave digestion technique was used in the decomposition of radix Paeoniae alba samples of different growing area, different growing time and before and after processing, and the contents of K, Ca, Na, Mg, Zn and Fe were determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The results of the determination show that radix Paeoniae alba samples are rich in the trace elements. The RSDs of these elements were lower than 4%, and the recovery ratio ranged between 99% and 113%.

[Determination of trace elements in radix ophiopogonis by HG-ICP-AES].

In this paper, a method of microwave digestion technique for the contents determination of trace elements Ni, Zn, Mn, Cu, Mg, Fe, Ca and Pb in radix ophiopogonis by hydride generation inductively coupled plasma atomic emition spectrometry (HG-ICP-AES) was reported. Its recovery ratio obtained by standard addition method ranged between 97.8% and 102.

Effects of soil properties on heavy metal accumulation in flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee) in Pearl River Delta, China.

This study was conducted to investigate the effects of soil properties on the heavy metal accumulation in flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var.