7362-34-7Relevant academic research and scientific papers
Vibrational spectra and normal coordinate calculations for trimethylselenonium-d0 and -d9 ions and dimethyl selenide-d0, -d6
Imai, Yoshika,Aida, Koyo,Itaya, Kingo
, p. 179 - 184 (1988)
The i.r. (4000-30 cm-1) and Raman (4000- 0 cm-1) spectra of trimethylselenonium iodide and dimethyl selenide have been obtained, together with those of their deuterated analogues.All the active fundamentals of the trimethylselenonium ion have been assigned, assuming C3v molecular symmetry.Normal coordinate calculations have been carried out for the trimethyl-selenonium ion and dimethyl selenide and the Se-C force constants of both the compounds are compared, including those of other corresponding chalcogenides.
Chemical form of selenium in naturally selenium-rich lentils (Lens culinaris L.) from Saskatchewan
Thavarajah, Dil,Vandenberg, Albert,George, Graham N.,Pickering, Ingrid J.
, p. 7337 - 7341 (2007)
Lentils (Lens culinaris L) are a source of many essential dietary components and trace elements for human health. In this study we show that lentils grown in the Canadian prairies are additionally enriched in selenium, an essential micronutrient needed for general well-being, including a healthy immune system and protection against cancer. Selenium K near-edge X-ray absorption spectroscopy (XAS) has been used to examine the selenium biochemistry of two lentil cultivars grown in various locations in Saskatchewan, Canada. We observe significant variations in total selenium concentration with geographic location and cultivar; however, almost all the selenium (86-95%) in these field-grown lentils is present as organic selenium modeled as selenomethionine with a small component (5-14%) as selenate. As the toxicities of certain forms of arsenic and selenium are antagonistic, selenium-rich lentils may have a pivotal role to play in alleviating the chronic arsenic poisoning in Bangladesh.
Synthesis, identification and chemical features of high-purity trimethylselenonium iodide
Zhao, Qiu-Xiang,Chen, Yu-Wei,Montaut, Sabine,Joly, Helen A.,Wang, Mohui,Belzile, Nelson
, p. 373 - 385 (2010)
High-purity (99.8%1.1) trimethylselenonium iodide (TMSeI) was synthesized from dimethyl selenide and methyl iodide. Its chemical structure was confirmed using the spectroscopic methods of nuclear magnetic resonance, Fourier transform infrared and electrospray ionization-mass spectrometry. Some thermodynamic properties of the pure TMSeI were studied with differential scanning calorimetry, and its decomposition point and entropy were determined to be 157.7C and 100.7kJ mol-1, respectively. The chromatographic and UV absorption behavior of the trimethylselenonium cation was also studied and the photochemical and chemical stability of TMSe+ and its decomposition products under varying microwave digestion conditions were examined. Some peculiar, yet interesting chemical properties on the stability of the compound were revealed. This is the first time that the chemical properties of this compound are comprehensively studied by various techniques and from different angles. The high purity of the synthesized compound allows it to be used as a primary standard compound in analytical method development and in basic and environmentally related studies.
Synthesis and complexation of dichalcogenoethers with cyclopropyl backbones, (CH2EMe)2 (E = Se or Te)
Levason, William,Ollivere, Luke P.,Reid, Gillian,Webster, Michael
experimental part, p. 1346 - 1352 (2010/06/21)
The reaction of LiTeMe with C(CH2Br)4 in thf gives {A figure is presented}(CH2TeMe)2 irrespective of the ratio of reactants, in contrast to the reaction with LiSeMe, which gives either C(CH2SeMe)4 or {A figure is presented}(CH2SeMe)2 depending upon the reaction conditions. The synthesis and properties of [{A figure is presented}(CH2TeMe2)2]I2, {A figure is presented}(CH2TeMeI2)2, [Mn(CO)3Cl{{A figure is presented}(CH2EMe)2}] (E = Se or Te) and [MCl(η6-p-cymene){{A figure is presented}(CH2EMe)2}]PF6 (M = Ru or Os) are described. X-ray crystal structures are reported for [{A figure is presented}(CH2TeMe2)2]I2, [Mn(CO)3Cl{{A figure is presented}(CH2TeMe)2}], [MCl(η6-p-cymene){{A figure is presented}(CH2TeMe)2}]PF6 (M = Ru, E = Se or Te and M = Os, E = Se). The effect of the cyclopropyl ring in the ligand backbone is to open up the C-C-C angle within the chelate ring, compared with trimethylene linked analogues. Selenium-carbon bond fission occurs on attempted quaternisation of o-C6H4(CH2SeMe)2 or {A figure is presented}(CH2SeMe)2 with MeI yielding [Me3Se]I.
EIN EINFACHES VERFAHREN ZUR SYNTHESE VON I UND EMe2 (E = Se, Te)
Kuhn, N.,Faupel, P.,Zauder, E.
, p. C4 - C6 (2007/10/02)
Treatment of MeELi (E = Se, Te) with excess methyl iodide gives EMe3+ cations which are dealkylated by phosphanes PR3 (R = n-C4H9, C6H5) to give the dimethyl chalcogenides ER2 in good yields.
REACTIONS OF YLIDE SALTS AND DIYLIDE CONTAINING Ph3P+ AND Se+(CH3)2 GROUPS AT POSITIONS 1,3-WITH ELECTROPHILIC REAGENTS
Magdesieva, N. N.,Chovnikova, N. G.,Kyandzhetsian, R. A.
, p. 1907 - 1911 (2007/10/02)
The reactions of an ylide salt (ω-triphenylphosphoranylideneacetonyldimethylselenonium bromide) and of the diylide obtained during deprotonation of the ylide salt with electrophilic reagents containing activated carbon-carbon and carbon-heteroatom multipl
Chemistry of O-Alkyl Selenoesters. Reaction with Triethylphosphine
Hansen, Per-Egil
, p. 1627 - 1634 (2007/10/02)
The reaction between triethylphosphine and a number of aliphatic and aromatic selenoesters under oxygen-free conditions have been investigated.The purple intermediate formed in the reaction with the aliphatic selenoesters was quenched with atmospheric oxygen and gave the corresponding esters, whereas quenching with methyl iodide gave the corresponding 1-alkoxy-1-iodoalkyltriethylphosphonium iodides (13)-(16).The 1-alkoxy-1-iodoalkyltriethylphosphonium iodides gave the 1-alkoxyalkyltriethylphosphonium iodides (17)-(20) upon treatment with methanol, and treatment with benzaldehyde at -70 deg C gave α-alkoxyalkyl phenyl ketones (22)-(25).The reaction between the selenobenzoates and triethylphosphine gave α-dialkoxy-stilbenes and -dibenzyls.When the reaction was carried out in cyclohexene 7-alkoxy-7-phenylbicycloheptanes were formed.The presence of benzaldehyde in the reaction mixture led to α-alkoxystilbenes.An explanation for these different reactions is presented.
