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100-97-0Relevant articles and documents
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Bachmann et al.
, p. 2769,2772 (1951)
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N-denitration of nitramines by dihydronicotinamides
Chapman, Robert D.,O'Brien, Richard A.,Kondracki, Paul A.
, p. 9655 - 9664 (1996)
N-NO2 bond scission in organic nitramines occurs in high yields by reaction with 1,4-dihydronicotinamides. HMX (3) and tetryl (4) were used as model aliphatic and aromatic nitremines in reactions with 1-benzyl-1,4- dihydronicotinamide (BNAH, 1), resulting in hexamethylenetetramine and N- methylpicramide (5), respectively, as the predominant products. Radical initiation of the electron-transfer denitrohydrogenation mechanism is achieved either by photolysis or chemically by dithionite ion. A polymer- supported analogue of BNAH effects similar, though slower, N-denitration.
Baur,Rueetschi
, p. 754,761,764 (1941)
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Koehn
, p. 903 (1899)
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Hexamethylenetetramine carboxyborane: synthesis, structural characterization and CO releasing properties
Ayudhya,Raymond,Dingra
, p. 882 - 889 (2017)
Carbon monoxide, although widely known as a toxic gas, has received great attention in the past few decades due to its promising role as a medical gas. Several classes of carbon monoxide releasing molecules (CORMs) have been synthesised with many of them having pharmacological activities under physiological conditions. Herein, we report the synthesis and structural characterization of the first example of amine carboxyborane that releases CO under physiological conditions without the aid of inducers. A representative compound hexamethylenetetramine carboxyborane (HMTA-CB) described here has a half-life of 2.7 days and gradually releases CO with the rate constant of 3.0 × 10?6 s?1. Its ability to promote cell growth shows the beneficial effect of slow CO release to supplement CO in small amounts over time.
Consistency of NMR and mass spectrometry determinations of natural- abundance site-specific carbon isotope ratios. The case of glycerol
Zhang,Trierweiler,Jouitteau,Martin
, p. 2301 - 2306 (1999)
Quantitative determinations of natural-abundance carbon isotope ratios by nuclear magnetic resonance (SNIF-NMR) have been optimized by appropriate selection of the experimental conditions and by signal analysis based on a dedicated algorithm. To check the consistency of the isotopic values obtained by NMR and mass spectrometry (IRMS) the same glycerol samples have been investigated by both techniques. To have access to site-specific isotope ratios by IRMS, the products have been degraded and transformed into two derivatives, one of which contains carbons 1 and 3 and the other carbon 2 of glycerol. The sensitivity of the isotopic parameters determined by IRMS to fractionation effects possibly occurring in the course of the chemical transformations has been investigated, and the repeatability and reproducibility of both analytical chains have been estimated. The good agreement observed between the two series of isotopic results supports the reliability of the two different approaches. SNIF-NMR is therefore a very attractive tool for routine determination, in a single nondestructive experiment, of the carbon isotope distribution in glycerol, and the method can be applied to other compounds. Using this method, the isotopic distributions have been compared for glycerol samples, obtained from plant or animal oils, extracted from fermented media, or prepared by chemical synthesis. Typical behaviors are characterized.
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Richmond,Myers,Wright
, p. 3659,3663 (1948)
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Selective Conversion of Carbon Dioxide to Formaldehyde via a Bis(silyl)acetal: Incorporation of Isotopically Labeled C1 Moieties Derived from Carbon Dioxide into Organic Molecules
Rauch, Michael,Strater, Zack,Parkin, Gerard
supporting information, p. 17754 - 17762 (2019/11/05)
The conversion of carbon dioxide to formaldehyde is a transformation that is of considerable significance in view of the fact that formaldehyde is a widely used chemical, but this conversion is challenging because CO2 is resistant to chemical transformations. Therefore, we report here that formaldehyde can be readily obtained from CO2 at room temperature via the bis(silyl)acetal, H2C(OSiPh3)2. Specifically, formaldehyde is released from H2C(OSiPh3)2 upon treatment with CsF at room temperature. H2C(OSiPh3)2 thus serves as a formaldehyde surrogate and provides a means to incorporate CHx (x = 1 or 2) moieties into organic molecules. Isotopologues of H2C(OSiPh3)2 may also be synthesized, thereby providing a convenient means to use CO2 as a source of isotopic labels in organic molecules.