2651-89-0Relevant academic research and scientific papers
4,5-Bis(diphenylphosphanyl)-1,2,3-triazole and its conversion to 1,1,3,3,-tetraphenyl-1,3-diphospha-2,4,5,6-tetraazapentalene
Trofimenko, Swiatoslaw,Rheingold, Arnold L.,Incarvito, Christopher D.
, p. 3506 - 3509 (2007/10/03)
Towards a new family of ligands: The synthesis of the ligand HLT (depicted left) is described. Although H LTappears to be a simple chelating diphosphane, the tiazole proton can be removed with a base to produce an anionic diphosphane. Thus HLT
Studies on the interaction of phosphine selenides and their structural analogues wth dihalogens and sulfuryl chloride
Krawczyk, Ewa,Skowronska, Aleksandra,Michalski, Jan
, p. 4471 - 4478 (2007/10/03)
The phosphine selenides, tris(dimethylamino)phosphine selenide, esters of selenophosphoric acid, and esters of selenophosphonic acid react with dihalogens and sulfuryl chloride to form halogenoselenophosphonium salts (≡ 3P-SeX)+X-. T
Reaction of three-coordinate phosphorus compounds with organophosphorus pseudohalogens. Part 4. The mechanism of interaction between bis(phosphinoyl) diselenides [R1R2P(O)Se]2 with three-coordinate phosphorus compounds
Krawczyk, Ewa,Skowronnska, Aleksandra,Michalski, Jan
, p. 1135 - 1140 (2007/10/03)
The reaction of bis(phosphinoyl) diselenides R1R2P(O)Se-SeP(O)R1R2 1 with P(III) compounds has been investigated and its mechanistic features have been elucidated by variable temperature 31P NMR spectroscopy. These studies show that in most cases phosphonium intermediates [>P(O)-Se-P+-O-P(Se)P(Se)-O-P+-O-P(Se)a phosphorane intermediate is observed. In the isomerization 7→10 and 13→16 the pathway of decomposition (deselenization, deoxygenation or dealkylation) to give stable end products is influenced by electronic and steric factors.
Reaction of Carbodiimides with Phosphorothioic, Phosphorodithioic, and Phosphoroselenoic Acids: Products, Intermediates, and Steps
Mikolajczyk, Marian,Kielbasinski, Piotr,Basinski, Wlodzimierz
, p. 899 - 908 (2007/10/02)
The reaction of the title acids with dicyclohexylcarbodiimide (DDC) used in a 2:1 ratio was found to give a complex mixture of products consisting of thio(seleno)pyrophosphates, thiolo(selenolo)phosphates, thiono(selenono)phosphates, dicyclohexylthiourea (DCTU), and a polymeric alkyl metaphosphate.When both reaction components are mixed in a 1:1 ratio, N-phosphoryl-N,N'-dicyclohexylthio(seleno)ureas (B) were formed.The formation of equimolar adducts (B) was also observed with other dialkyl- and diarylcarbodiimides.The spectral properties (especially the value of 3JP-H) and reactivity of these adducts are strongly dependent on their conformation.The distinct conformational differences between the adducts B derived from DCC and diisopropylcarbodiimide (DiPC) and those obtained from dibenzylcarbodiimide (DBC) and diarylcarbodiimides were revealed by X-ray analysis of the selected N-phosphorylthioureas.By means of low temperature FT 31P NMR spectra it was demonstrated that the adducts (B) arise from the first formed unstable S(Se)-phosphorylisothio(seleno)ureas (A) as a result of S(Se)->N-phosphoryl migration.The differences in ability of the phosphoryl group to undergo S(Se)->N and O->N 1,3-shifts are briefly described.N-Phosphorylthio(seleno)ureas (B) obtained from DCC and DiPC, in contrast to those prepared from DBC and diarylcarbodiimides, reacted with a second thio(seleno)acid molecule.Crossover experiments and the use of O,O-diethyl phosphorothioate containing 35S-labeled sulfur showed that the adducts (B) are in equilibrium with their unstable isomers (A), the latter being active phosphorylating agents.The formation of the final reaction products was rationalized in terms of the threedirectional attack of the thioacid anion at the phosphorus, alkoxy carbon, and central carbon atoms of the protonated adduct (A).
