Antimony tetraethyl

Longi and Mazzocchi have gas chromatographed mixtures of lead, tin and antimony tetraethyl on columns comprising 7.5% paraffin wax on Chromosorb W at 143°C with an injection temperature of 196°C and using helium as a carrier gas. 

The reaction of toluene-3,4-dithiol(3,4-dimercaptotoluene) and antimony trichloride ia acetone yields a yeUow soHd Sb2(tdt)2, where tdt is the toluene-3,4-dithiolate anionic ligand (51). With the disodium salt of maleonitnledithiol ((Z)-dimercapto-2-butenedinitrile), antimony trichloride gives the complex ion [Sb(mnt)2] , where mat is the maleonitnledithiolate anionic ligand. This complex has been isolated as a yeUow, crystalline, tetraethyl ammonium salt. The stmctures of these antimony dithiolate complexes have apparendy not been unambiguously determiaed. 

A.sahi Chemical EHD Processes. In the late 1960s, Asahi Chemical Industries in Japan developed an alternative electrolyte system for the electroreductive coupling of acrylonitrile. The catholyte in the Asahi divided cell process consisted of an emulsion of acrylonitrile and electrolysis products in a 10% aqueous solution of tetraethyl ammonium sulfate. The concentration of acrylonitrile in the aqueous phase for the original Monsanto process was 15—20 wt %, but the Asahi process uses only about 2 wt %. Asahi claims simpler separation and purification of the adiponitrile from the catholyte. A cation-exchange membrane is employed with dilute sulfuric acid in the anode compartment. The cathode is lead containing 6% antimony, and the anode is the same alloy but also contains 0.7% silver (45). The current efficiency is of 88—89%, with an adiponitrile selectivity of 91%. This process, started by Asahi in 1971, at Nobeoka City, Japan, is also operated by the RhcJ)ne Poulenc subsidiary, Rhodia, in Bra2il under Hcense from Asahi. 

Zirconocene dichloride reacts with butyllithium and hex-3-yne at —78 °C in THF to give almost quantitatively red l,l-bis(cyclopentadienyl)-2,3,4,5-tetraethyl-l-zirconacyclopenta-2,4-diene 60. Transmetallation with antimony trichloride yields the corresponding l-chloro-2,3,4,5-tetraethyl-l-stibole (Scheme 9) <20000M2393>. 

BAZUDEN (333-41-S) A weak base. Hydrolyzes slowly in water and dilute acid. With excess water, this compound produces diethylthiophosphoric acid and 2-isopropyl-4-methyl-6-pyrimidol. With insufficient water, this compound produces highly toxic tetraethyl monoth-iopyrophosphate. Incompatible with antimony(V) pentafluoride, diacetate, magnesium, silver nitrate. Reacts with strong acids, alkalis, copper-containing compounds, oxidizers. 

DITHIODIPHOSPHORIC ACID, TETRAETHYL ESTER (3689-24-5) Hydrolyzes slowly in water. Incompatible with antimony(V) pentafluoride, lead diacetate, magnesium, silver nitrate. Corrodes iron. 

---