Metal-free and environmentally friendly synthesis highly controlled by natural sources like visible light and air (or oxygen) is always a pursuit of green chemistry. In this paper, an atmosphere and light tuned highly diastereoselective synthesis of two important polyheterocyclic skeletons: cyclobuta/penta[b]indoles from aniline-tethered alkylidenecyclopropanes with alkynes, has been developed....

experiment. Although the attendance was small and there was a disappointing absence of the Mental Hospital Matrons whom it was expressly designed to attract, there was a very friendly atmosphere and much lively discussion, centering on the subjects: (1) How to attract the right type of girl for the mental nursing profession. (2) The need for improvement in the conditions under which many nurses...

With the reduction of natural gas and petroleum sources and subsequent increases in their costs, energy from coal is becoming increasingly popular. However, coal is not a clean technology, so with this demand comes a demand to make this energy source more environmentally friendly. Trace elements, such as mercury, arsenic, and selenium, are highly volatile and are known to escape into the atmosp...

Studies of climate change traditionally focus on long-term changes taking place in the troposphere. This is understandable, as this is the part of the atmosphere that most directly affects life on the surface. However, long-term trends higher in the atmosphere can have important consequences as well. The middle and upper atmosphere consist of the stratosphere (~15-50 km), the mesosphere (50-90...

A base-promoted one-pot tandem reaction sequence has been developed to transform electron-deficient chromone-fused dienes 1 and 1,3-dicarbonyl compounds 2 to functionalized 2-hydroxybenzophenones 3 under mild conditions. This domino process, which involves multiple reactions, including Michael addition/cyclization/elimination, serves as an efficient, economic, and eco-friendly method for the co...

© Meteoritical Society, 2002. Printed in USA. 867 Prelude preprint MS#4690 Abstract–We explore the likely production and fate of 14C in the thick nitrogen atmosphere of Saturn's moon Titan and investigate the constraints that measurements of 14C might place on Titan's photochemical, atmospheric transport and surface-atmosphere interaction processes. Titan's atmosphere is thick enough that cosmi...

‎‎let $g=(v,e)$ be a simple graph‎. ‎an edge labeling $f:eto {0,1}$ induces a vertex labeling $f^+:vtoz_2$ defined by $f^+(v)equiv sumlimits_{uvin e} f(uv)pmod{2}$ for each $v in v$‎, ‎where $z_2={0,1}$ is the additive group of order 2‎. ‎for $iin{0,1}$‎, ‎let‎ ‎$e_f(i)=|f^{-1}(i)|$ and $v_f(i)=|(f^+)^{-1}(i)|$‎. ‎a labeling $f$ is called edge-friendly if‎ ‎$|e_f(1)-e_f(0)|le 1$‎. ‎$i_f(g)=v_f(...

Cold In-place Recycling (CIR) has been widely used in the world since it is easy to apply field at a low cost. However, not normally as surface layer result of its inconsistent quality due an excessive amount fine aggregates pulverized during milling process. Hot (HIR) can retain original shape aggregates, but often produces large Volatile Organic Compounds (VOCs). Therefore, third in-place rec...