The Use of Bunte Salts in Synthesis. I. The Preparation of Mercaptals

Abstract

The ether was evaporated under reduced pressure and the sirupy residue taken up in alcohol. A small amount of amorphous solid separated and was removed by filtration. The alcoholic solution was poured into ether and the resulting solution washed thoroughly with water and then extracted with 5% sodium carbonate solution. The intensely red aqueous layer was separated and acidiiled and extracted with ether. The ether layer was washed with several portions of dilute ammonium carbonate solution, dried over sodium sulfate and evaporated to dryness. The yellow-brown, solid residue was extracted with 25 cc. of boiling xylene in several portions. The filtered xylene solution was allowed to stand for several days and slowly deposited a mixture of an amorphous yellow powder (40 mg.) and hard brown-yellow nodules (190 mg.). The nodules were partially purified by solution in cold, dilute aqueous-alcoholic sodium hydroxide followed immediately by precipitation with dilute hydrochloric acid. The pigment was thus obtained as brownish-yellow needles.

Se‐catalyzed process of sodium bisulfite disproportionation

“…As is known, the structure of SeSO 3 2− is similar to that of S 2 O 3 2− . Many researchers proposed that S 2 O 3 2− released HS − under acid conditions. Similarly, many studies suggested that HSe − could be released from the hydrolytic decomposition of SeSO 3 2− in acidic media.…”

A highly efficient heterogeneous rhodium(I)‐catalyzed C–S coupling reaction of thiols with polychloroalkanes or alkyl halides under mild conditions

“…PhCH 2 SH CH 2 Cl 2 CH 2 (SCH 2 Ph) 2 (3e) [12] 80 6 CH 3 (CH 2 ) 3 SH CH 2 Cl 2 CH 2 (SBu-n) 2 (3f) [24] 88 7 HO(CH 2 ) 11 SH CH 2 Cl 2 CH 2 [S(CH 2 ) 11 OH] 2 (3 g) [12] 67 8 c PhSH (CH 2 Cl) 2 (CH 2 SPh) 2 (3 h) [25] 93 9 c 4-ClPhSH (CH 2 Cl) 2 (CH 2 SPhCl-4) 2 (3i) [26] 87 10 c p-TolSH (CH 2 Cl) 2 (CH 2 STol-p) 2 (3j) [12] 90 11 c 4-FPhSH (CH 2 Cl) 2 (CH 2 SPhF-4) 2 (3 k) [26] 85 12 c PhCH 2 SH (CH 2 Cl) 2 (CH 2 SCH 2 Ph) 2 (3 l) [27] 82 13 c CH 3 (CH 2 ) 3 SH (CH 2 Cl) 2 (CH 2 SBu-n) 2 (3 m) [12] used in the next run, and almost consistent activity is observed for ten consecutive cycles (Table 4). In addition, rhodium leaching in the supported catalyst was also determined.…”

Mechanism of Spontaneous Formation of Monolayers on Gold from Alkyl Thiosulfates

“…This Bunte salt was prepared following literature procedures. , 1-Bromohexadecane (1.527 g, 5.001 mmol) was dissolved in 20.0 mL of absolute ethanol and then added to a solution containing sodium thiosulfate pentahydrate (1.241 g, 5.000 mmol) in 20.0 mL of water. The mixture was refluxed until it became homogeneous (18−20 h).…”