This paper describes the preparation by several methods of trialkyloxonium ions containing five-membered rings and the study of their structures by observing the nuclear magnetic resonance (NMR) ...

Understanding the concept of resonance structures is crucial for students grappling with organic chemistry. Resonance structures illustrate the delocalization of electrons within molecules ...

Now, the spacecraft has enabled scientists to visualize the layer cake of structures that comprise the upper 1,000 feet (300 meters) of the moon's surface in finer detail than ever before.

Abstract: In this paper, we showed the combination of continuous etching and cyclic etching with/without constant Ar flow to each multilayer structure such as InGaAs/InAlAs/InP for optical devices ...

They would produce two sets of NMR peaks (e.g. two separate and distinct NMR spectra) that could be experimentally observed. We designate this class of conformers as pseudo-resonance structures. If ...

Resonance structures are then employed to approximate the true electronic structure. For more information, see the following related content on ScienceDaily: Related Stories ...

Tumor promoters, apoptosis and autophagy modulators, chemotherapy drugs, and endogenous steroids demonstrate molecular similarity relative to cyclic nucleotide structure. This study explores relative ...