Spectroscopic Study on the Pyrolytic Products of Amines

Abstract

From the early days of alchemy, heating has been a primary method to promote chemical reaction and to obtain new materials. Organic and inorganic compounds, such as benzene and sulfuric acid, were being prepared pyrolytically by the early 19th century. The use of light, particularly the advent of the laser in this century, added another tool for chemical reaction. The ease of regulation and superior selectivity of laser frequencies are advantages over the thermal reaction. State-to-state chemistry in combination with the laser is highly developed at the present time. On the other hand, although some of the black-box character of thermal reactions makes it difficult to rigorously study reaction mechanisms, most of the new compounds are still created by the effects of heating.     

Raman,Infrared and 1H-NMR Spectra of Hexamethyldisilylchalcogenides

The Raman, infrared and ¹H-NMR spectra of (CH₃)₃ -X-Si (CH₃)₃ (X=O,S,Se,Te) were measured, and the assignment was carried out by comparison with those of the structurally related compounds, (CH₃)₃ SiCl and (CH₃)₃ Si-Si (CH₃)₃. The vibrational spectra of (CH₃)₃ Si-X-Si (CH₃)₃ can be interpreted in terms of a non-rigid D_3d symmetry with internal rotations, because those of skeletones of the molecules indicate the lack of coincidence between Raman and infrared frequencies. The ¹H-NMR spectra also support a non-rigid D_3d model, because only one band for CH₃ group appears.     

Simple fluorophotometric determination of cobalt(II) with p-hydroxy-2-anilinopyridine and hydrogen peroxide

Summary A simple and sensitive determination of cobalt(II) is based on its fluorescence reaction with p-hydroxy-2-anilinopyridine and hydrogen peroxide. The relative standard deviation is 2.5% (n=5). An application to pharmaceutical preparations is recommended.The application of diarylamine compounds in analytical chemistry. IV.-Part III see ref. [1]     

The temperature dependency of EDFAs in the 1480 nm pumping configuration

A theoretical study of the temperature-dependent gain and noise figure effects on erbium-doped fiber amplifiers (EDFAs) pumped at 1480 nm is investigated, solving the propagation equations related to two level systems. The solution of these equations is based on the population and temperature difference among amplification levels. The temperature-dependent propagation equation considered is used to determine the gain and noise figure effects on EDFAs. The population difference depends on pump and signal powers, Boltzmann factor K_B, cross-sections, noise figure (NF) and Er³⁺ concentration. The temperature-dependent gain and noise figure effect the EDFA length are numerically obtained for the temperature range of −20 °C to +60 °C. All of the analyses consist of the amplified spontaneous emission (ASE) effect.     

A new and unexpected aminoisoquinoline formed under bischler-napieralski reaction conditions provides for A new synthesis of 3-aminoisoquinolines

Treatment of an amide, 1 , of a substituted 2-phenethylamine using Bischler-Napieralski reaction conditions with acetonitrile as a solvent, gave the desired dihydroisoquinoline 2 as well as an unexpected 3-aminoisoquinoline product 3 . The applicability of this finding as a method of synthesizing 3-aminoisoquinoline derivatives was examined.     

Axinelloside A, an unprecedented highly sulfated lipopolysaccharide inhibiting telomerase, from the marine sponge, Axinella infundibula

Axinelloside A was isolated from the lipophilic extract of the Japanese marine sponge Axinella infundibula as a strong human telomerase inhibitor (IC(50) 2.0 microg/mL). It has the molecular weight of 4780.4 as the monoisotopic mass of the 19 sodium salt. The chemical structure was elucidated mainly by spectroscopic methods (2D NMR and MS). Axinelloside A consists of twelve sugars, e.g., a scyllo-inositol, a D-arabinose, 5 D-galactoses, and 5 L-fucoses, together with an (R)-3-hydroxy-octadecanoic acid, 3 (E)-2-hexadecenoic acids, and 19 sulfates.