Gelest Technical Reports
In amongst the considerable chemistry of acetylenes there lies some unique chemistry of alkynylsilanes (silylacetylenes) some of which is reviewed herein. This unique character is exemplified not only in the silyl protection of the terminal C–H of acetylenes, but also in the ability of the silyl group to be converted into other functionalities after reaction of the alkynylsilane and to its ability to dictate and improve the regioselectivity of reactions at the triple bond. This, when combined with the possible subsequent transformations of the silyl group, makes their chemistry highly versatile and useful.
ECS Journal of Solid State Science and Tech: Silicon Nitride and Silicon Nitride-Rich Thin Film Technologies: Trends in Deposition Techniques and Related Applications – Kaloyeros, Jove, Goff, & Arkles
This article provides an overview of the state-of-the-art chemistry and processing technologies for silicon nitride and silicon nitride- rich films, i.e., silicon nitride with C inclusion, both in hydrogenated (SiNx:H and SiNx:H(C)) and non-hydrogenated (SiNx and SiNx(C)) forms. The emphasis is on emerging trends and innovations in these SiNx material system technologies, with focus on Si and N source chemistries and thin film growth processes, including their primary effects on resulting film properties. It also illustrates that SiNx and its SiNx(C) derivative are the focus of an ever-growing research and manufacturing interest and that their potential usages are expanding into new technological areas.
Metal trifluoromethanesulfonate catalysts, or metal triflates, show advantages in their strong Lewis acidity and their increased tolerance for protic solvents and water, which can result in by-products of the chemical reaction of interest. In addition, metal triflates are generally considered to be environmentally friendly catalysts. This mini-review will present some examples of the applications of various metal triflates in synthetic organic chemistry. Click here for product information on metal triflates.
While the sensory appeal of coatings has always been an important driver of consumer acceptance of devices and appliances, positive tactile interaction properties of coatings are gaining increased attention in an industry that has focused primarily on their optical characteristics. Understanding both the aesthetic and functional significance of these tactile characteristics is therefore an area of opportunity. Click here for more information on reactive siloxanes.
While microorganisms are essential and symbiotic, bacteria, fungi and viruses can also cause disease. They can be removed mechanically, thermally, and as this article describes, chemically, with Gelest’s BIOSAFE® antimicrobial, a condensed polymeric silane quaternary ammonium salt. Independent studies show that hand sanitizer formulas containing the BIOSAFE antimicrobial in conjunction with another quaternary ammonium compound meet and exceed U.S. Food & Drug Administration efficacy criteria for hand sanitizer antimicrobial protection. Click here for more product information on BIOSAFE.
Silicone elastomers with elongations approaching 5,000%, nearly four times greater than any other commercial elastomer, are now available. These new elastomers utilize a cure mechanism that generates elastomeric properties by driving linear polymers to extremely high molecular weights with concomitant formation of intra- and inter-chain entanglements, rather than covalent crosslinking. Click here for product information on Gelest ExSil 100 (EM2-EX100).
International Fiber Journal: Gelest Biosafe – Protecting Textiles Safely – Wagner et al.
BIOSAFE® is a new siliconbased antimicrobial from Gelest, Inc. Its novel activity imparts long lasting bacteriostatic, fungistatic and algistatic properties to substrates, such as textiles, preventing deterioration and discoloration caused by fungi. Furthermore, BIOSAFE antimicrobials prevent algae growth and inhibit the growth of odor-causing bacteria. Click here for more product information on BIOSAFE.
Chimica Oggi/Chemistry Today: The Synthesis of Gliflozins – Larson
Some of the general approaches to the key steps in the synthesis of gliflozins, a class of glucose transporters, are discussed. In particular the glycosidation step for the introduction of the key aryl moiety onto the glucose and the reduction steps are presented. Click here for more product information on tetramethyldisiloxane (TMDO, TMDS) reducing agent.
Chimica Oggi/Chemistry Today : Organosilane Reductions with Polymethylhydrosiloxanes – Larson
The reduction of a comprehensive range of organic functional groups ranging from carboxylic acids to aryl fluorides have been shown to be possible with a variety of organosilanes. A comprehensive review of the ionic and transition metal-catalyzed reductions of organic functional groups has recently appeared.
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