26987-19-9Relevant academic research and scientific papers
Efficient system for the preparation of [13N]labeled nitrosamines
Gomez-Vallejo, Vanessa,Kato, Koichi,Hanyu, Masayuki,Minegishi, Katsuyuki,Borrell, Jose I.,Llop, Jordi
scheme or table, p. 1913 - 1915 (2009/11/30)
In the present Letter, a fast and reproducible method for the synthesis of N-[13N]nitrosamines is reported. The labeling strategy is based on trapping [13N]NO2- in an anion exchange resin. The reaction with secondary amines in the presence of Ph3P and Br2 led to the formation of the desired nitrosamines in short reaction times (2 min) with excellent radiochemical conversion (>45%). Final radiotracers were obtained after purification in good radiochemical yields (>30%, decay corrected). Radiochemical purity was above 99% in all cases.
Reactions of Triphenylphosphine and Tributylphosphine with Tetraethylthiuram Disulfide and Diethyldithiocarbamate Complexes of Tellurium(II) and Tellurium(IV)
Kumar, R. Krishna,Aravamudan, G.,Udupa, M. R.
, p. 39 - 50 (2007/10/03)
Triphenylphosphine reduces terakis(diethyldithiocarbamato)tellurium(IV), TeL4 [L = diethyldithiocarbamate, (C2H5)2NCS2-] to the tellurium(II) complex TeL2, on which PPh3 has no effect. The reaction of the tellurium(IV) complex, TeL2X2 (X = I, Br, Cl) with PPh3 in the molar ratio of 1:1 results in the formation of TeLX, CS2 and an aminophosphonium halide, (C2H5)2NPPh3+X-. Another mole of PPh3 reduces TeLX further to elemental tellurium. The reactions of TeL3X (X = I, ClO4, PF6) systems with excess PPh3 lead interestingly to the formation of TeL2 and elemental tellurium, with the concomitant formation of CS2, (C2H5)2NPPh3+X- and (C2H5)2NC(S)PPh3+X-. The reactions were performed in dichloromethane solutions and 31P NMR spectroscopy was widely used for the identification of various phosphorus containing species.
MECHANISM OF THE CATALYTIC ARYLATION OF P(III) AMIDES
Sentemov, V. V.,Gavrilova, E. L.,Krasil'nikova, E. A.
, p. 34 - 37 (2007/10/02)
By methods of 31P NMR, ESR, and electronic spectroscopy it was shown that complexation processes are responsible for the reactions of aryl halides with P(III) amides in the presence of Ni(II) salts.Phosphorus-containing complexes of Ni(II) are formed in the initial stages of the catalysis of the reactions of inactivated aryl halides with P(III) amides, and these are further reduced to Ni(O) and Ni(I).A possible mechanism of the reaction studied is proposed on the basis of experimental and literature data.
SYNTHESIS OF AMINOPHOSPHONIUM SALTS BY THE REACTIONS OF ARYL HALIDES WITH P(III) AMIDES IN THE PRESENCE OF Ni(II) SALTS
Krasil'nikova, E. A.,Sentemov, V. V.,Gavrilova, E. L.
, p. 594 - 596 (2007/10/02)
Aminophosphonium salts +(NEt2)3-nAr>Y- were synthesized by the phosphorylation of aryl halides in the presence of Ni(II) salts.The main reaction is accompanied by the formation of a by-product via the oxidation of P(III) amides.
PHOSPHORORGANISCHE VERBINDUNGEN 89 Quartaere Phosphoniumsalze mit Heteroatomen am Phosphor Herstellung, Eigenschaften und Elektroreduktive Spaltung
Horner, Leopold,Jordan, Manfred
, p. 209 - 214 (2007/10/02)
The half-potential of 35 quaternary phosphonium salts with one or more hetero-atoms attached to phosphorus are reported, and the fission products determined for the electroreduction of nine phosphonium salts.The influence of the ligands attached to phosphorus by hetero-atoms on both the half-wave potential and the course of the fission reaction is discussed.The order of precedence in the cleavage of the ligands at phosphorus is examined to determine whether a meaningful, qualitative order of stability for the corresponding ligands as free radicals can be deduced.
