Mild and applicable synthesis of mono-, bis-, and spiro- perimidines is demonstrated in high yields via the condensation of 1,8-diaminonaphthalene and aldehydes or ketones in the presence of sulfamic acid as a green and highly efficient catalyst. This environmentally benign and clean synthetic pathway offers several advantages, such as high yields, short reaction times and easy work-up procedure.

This paper measures the response of U.S. based multinational …rms to the Clean Air Act Amendments (CAAA), which dramatically strengthened U.S. environmental regulation. Using a panel of …rm-level data over the period 1966-1999, I estimate the e¤ect of regulation on a multinational’s foreign production decisions. The CAAA induced substantial variation in the degree of regulation faced by …rms, a...

Clean water is an essential resource for life, and its demand continuously increasing with the rapid growth in population, while freshwater reserves are also depleting. A large amount of wastewater released by different industries, which affecting environment as well polluting reserves. Recycling treatment highly to meet clean protect environment. Activated carbon can be used primary, secondary...

A practical and new method for the synthesis oxindole substituted pyrrolo[2,3-d]pyrimidines by the condensation of isatin, acetophenone and 6-amino-uracil under ultrasound irradiation conditions at 60 °C was described. The reaction was developed via a sequential tandem process to afford the oxindole substituted pyrrolo[2,3-d]pyrimidines in good to excellent yields. All reactions performed effic...

Non-polluting fuels, such as hydrogen, are widely considered to be a promising way decrease the environmental problems caused by burning of fossil fuels. Finding materials that can help us generate these “clean” fuels is difficult and time-consuming process. Computer simulation technology most important tool in this area, because it helps scientists understand existing also them design new type...

In order to respond the increased demand for clean energy without harming atmosphere through polluting emissions, Energy production from hydrogen combustion become largely used. This work presents a numerical study of injection conditions effect on structure H2-Air diffusion flame. The aim is reproduce practical case non-polluting and resulting in very high temperatures. configuration composed ...

Highly substituted piperidines were synthesized via the condensation of aromatic aldehydes and aromatic amines with β-ketoesters in the presence of antimony(III) chloride at ambient condition. This reaction has any advantages such as easy work-up, clean procedure, and good yields.

Alzheimer's disease (AD) has a high worldwide prevalence but little is known about its aetiology and risk factors. Recent research suggests environmental factors might increase AD risk. We aim to describe the association between AD mortality and the presence of highly polluting industry in small areas in Spain between 1999 and 2010. We calculated AD age-adjusted Standardized Mortality Ratio (SM...