The exchange reaction of tetramethyldipnictogens with dimethyldichalcogenides

Abstract

Tetramethyldipnictogens Me,E, (E = P, As, Sb, Bi) undergo exchange reactions with dimethyldichalcogenides Me, A 2 (A = S, Se, Te) to produce the corresponding (dimethylpnicto)methylchalcogenides M%EAMe. These compounds have been characterized by NMR, Raman and mass spectroscopy. IntrctductIon In the course of a study of element-element bonding of tetraorganodipnictogens R,E, (E = P, As, Sb, Bi) [l-3] we became interested in obtaining related compounds containing hetero element-element bonds. In a previous paper we reported that interpnictogen compounds MqEE'Me, could be prepared by the exchange reaction of the corresponding tetramethyldipnictogens (eq. 1) [4].

Speciation of volatile arsenic at geothermal features in Yellowstone National Park

“…The fragment pattern observed by GC-MS matches dimethylarsenomercaptane (CH 3 ) 2 AsSCH 3 . This compound has structurally been characterized by nuclear magnetic resonance (NMR), Raman and mass spectrometry (Ashe and Ludwig, 1986), and been observed after derivatization of compost samples in the laboratory (Kö sters et al, 2003). Under natural conditions it has never been detected before.…”

“…The volatile dimethylarsenomercaptane, (CH 3 ) 2 AsSCH 3 , has been synthesized and observed in laboratory experiments (Ashe and Ludwig, 1986;Kö sters et al, 2003) but has not been identified previously in natural samples. The toxicities of the chloro-and thioarsines have not yet been studied.…”

Selenium‐Substituted Phosphaalk­enes Obtained through 1,2‐Elimination of Chlorosilanes from Selenen­ylchlorophosphines

“…Initially, the attempted thermal 1,2-elimination of chlorosilane from 1 to give phosphaalkene 2 was unsuccessful; that is, treatment of degassed C 6 D 6 or CH 2 Cl 2 solutions of 1 at ca. [10] Conversely, phosphaalkene 2 was stable at room temperature, both in the solid state and in degassed solution of C 6 D 6 or CH 2 Cl 2 . [5] Conversely, the addition of small amounts of a Lewis acid such as AlCl 3 (0.5 equiv.)…”

Covalently bonded compounds of heavy group 15/16 elements – Synthesis, structure and potential application in material sciences

“…[56] However, the most convenient route for such compounds including those containing sterically less demanding organic substituents, for which intermolecular interactions between adjacent molecules in the solid state are most likely, are reactions of low-valent dipentelanes R 4 M 2 (M = Sb, Bi) containing weak M-M bonds with dichalcogenanes E' 2 R 2 (E' = S, Se, Te). [8,10,18,19,20,21,22] For instance, R 2 SbER' (E = S, Se, Te; R = Me, Et, R' = Me, Ph) were obtained from reactions of Sb 2 R 4 and E 2 R' 2 at ambient temperature (Sb 2 Me 4 ) and -40 °C (Sb 2 Et 4 ), respectively. [15,16,17] R 2 SbTeMe (R = Me, Et), which decompose upon heating with formation of the corresponding trialkylstibine SbR 3 and RSb(ER') 2 , were reported to be thermochromic, indicating the presence of intermolecular contacts between the metal centers in the solid state.…”