Introduction Hydrogen bonding (HB) is a ubiquitous force in nature. It plays a crucial role in biocatalysis. Not until recently have chemists begun to implement this force in catalysis, but already with extraordinary success. However, chemists have only recently attempted to harness the power of using hydrogen bonds to perform catalysis, and the field is relatively undeveloped compared to research in Lewis acid catalysis. Nevertheless, the development of chiral Brø, nsted acids as activation forces is a highly challenging task in asymmetric catalysis, presumably because much weaker hydrogen-bonding interactions between the promoter and substrates would be the source of stereochemical control. Recently, chemists have begun to appreciate the potential offered by hydrogen bonding as a force for electrophile activation in smallmolecule-based catalysis. In particular, the utilization of chiral hydrogen-bond donors as promoters has been the subject of intense research, as evidenced by the number of research papers that have appeared....

A new geometrical hydrogen bond parameter, defined as delta(+) which takes the position of hydrogen into account, has been introduced. It is shown that there exists a strong correlation between delta(+) and other geometrical parameters and proton anisotropic chemical shift. It has been suggested that this correlation could be used for estimating the position of hydrogen bond from proton anisotropic chemical shift measurements and X-ray diffraction data.

Introduction: Hydrogen peroxide poisoning can cause death. The chemical reactions in the body will produce complications, such as stroke, perforation of the gut, and embolism. These complications are most likely seen with high concentrations. Case Presentation: The patient was a 55-year-old female, who tried to commit suicide by ingestion of approximately 150 cc of hydrogen peroxide. She was brought to the emergency room for medical treatment. During the physical examination, the patient had air in the neck and mediastinum, which is a strong indication of acute mediastinitis. The patient was treated with esophagectomy and feeding jejunostomy. The pathology reported first degree burns of the esophagus without perforation. The patient underwent reconstructive surgery and treatment for eight weeks, yet she died during surgery as a result of low ejection fraction (EF). Conclusions: In this case, the patient intentionally ingested a low concentration (15%) of hydrogen peroxide and as a result experienced first degree burns in the esophagus. The patient did not require surgery for treatment. The presence of white mucus and air around the esophagus and stomach was thought to be indicative of acute mediastinitis and mistakenly exposed the patient to major surgery.

This paper proposes a stochastic optimization problem for local integrated hydrogen-power energy systems. In the proposed model, the integrated system tries to reduce the day-ahead operation costs using dispatchable resources, renewable energy resources, battery energy storage systems, demand response programs, and energy trading with the upstream network. Also, the integrated system is able to transact electricity with the upstream network to get more benefits. When the generation of renewable resources is high, the integrated system can convert the surplus electricity to hydrogen by power-to-gas units. The generated hydrogen can be sold to different industries or stored in the hydrogen tank storage. During peak hours, the stored hydrogen can be imported into the gas-to-power unit to generate the required electricity. The sector coupling between electricity and hydrogen provides more flexibility for integrated systems and is an effective solution to control the uncertainty of renewable energy resources in order to increase the power and energy flexibilities. The simulation results show that the proposed sector coupling provides the opportunity for electricity and hydrogen trading for integrated system. The benefit of the integrated system by electricity and hydrogen trading with the upstream network and different industries are $ 88.39, and $ 6846, respectively.