Copper-mediated Chan-Evans-Lam N-arylation of 5-methylene-4-aryl-1,5-dihydro-2H-pyrrol-2-one derivatives

A simple and efficient procedure for the synthesis of N-aryl 5-methylene-4-aryl-1,5-dihydro-2H-pyrrol-2-one derivatives has been developed through copper-mediated CN bond formation. The synthetic protocol allows for versatile and robust CN arylation with a range of readily available boronic acids under mild conditions.     

Impact of information technology on the performance of logistics industry: the case of Hong Kong and Pearl Delta region

Over the last decade, a number of research studies have advocated the use of information technology (IT) in different aspects of logistics and distribution operations. This study examines the current state of the use of IT and its impact on logistics service performance through a survey of 210 logistics companies in Hong Kong and the Pearl River Delta region. A hypothetical model is also proposed in which the theories of the market-based view and the resource-based view are applied to link up the implications of IT capabilities with logistic performance. The model was tested using structural equation modelling. The findings suggested that (i) IT implementation directly enhances the service quality of the logistics companies; (ii) the impact of IT implementation improves service quality thereby creating competitiveness.     

An almost all result on $${q_1q_2\equiv c ({\rm mod}\, q)}$$

In this paper, we consider the congruence equation \({q_1 q_2 \equiv c ({\rm mod}\, q)}\) with \({a < q_1 \leq a+q^{1/2+\epsilon}}\) and \({b < q_2 \leq b+q^{1/2+\epsilon}}\) and show that it has solution for almost all a and b. Then we apply it to a question of Fujii and Kitaoka as well as generalize it to more variables. At the end, we present a new way to attack the above congruence equation question through higher moments.