The polymerization of styrene was mediated by copper(I) bromide/pentramethyl diethyl-triamine(PMDETA) using ethyl 2-bromopropionate(EBP) as initiator and a catalytic amount of Lewis acid(LA),such as aluminum hydroxide(AH),boric acid(BA),and(2-methylpropyl)boronic acid(MPBA),as a rate-accelerating additive.

Compared to the traditional Lewis acid catalysts which comprised sulfur and zeolite catalytic chlorination system,it took on much superiority such as high-selectivity,high-yield,simple operation,savings and environmental protection etc.

This paper gave an overall review of the application of lewis acid catalytic on various drug synthesis.

Analysis of Lewisite in Soil;

Determination of Microamount of Lewisite in Soil by Gas Chromatography Microwave Induced Plasma Atomic Emission Detection;

Determination of the Lewisite and Ar- senic in Water after Derivatization with 2,3- dimercaptopropanol by Gas Chromatography- Mass Spectrometry;

his paper deals with the introduction and review of different polymerization mechanisms of conjugated diene in the presence of Lewis base used as polar additive,proposed by different authors abroad as well as in China.

This paper introduces the complexation and dissociation of different Lewis bases with active species in the area of anionic polymerization reported in literatures and elucidates their applications.

Some Thoughts on Urban Planning System of Louisville,USA;

A comparative study between Louis Kahn and his Chinese classmates;