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Addition of 1,2-ethanedithiol to 2-bromo-1,1-diethoxyethane; 2,3-dihydro-1,4-dithiine

SyntheticPage 418
DOI: 10.1039/SP418
Submitted May 28, 2010, published Jun 01, 2010
Nikola Paul Chmel (
A contribution from Scott group, Warwick University

			Reaction Scheme: Addition of <SPAN class=csm-chemical-name id=csm1288213564319 title=1,2-ethanedithiol>1,2-ethanedithiol</SPAN> to <SPAN class=csm-chemical-name id=csm1288213585312 title=2-bromo-1,1-diethoxyethane>2-bromo-1,1-diethoxyethane</SPAN>

Chemicals Used

p-toluenesulfonic acid monohydrate


Toluene (330 ml) and p-toluenesulfonic acid monohydrate (0.33 g, 1.7 mmol) were heated to reflux in Dean-Stark apparatus under nitrogen for 24 h. The collected water was removed and the Dean-Stark apparatus was replaced with a reflux condenser. 1,2-ethanedithiol (14 ml, 0.167 mol) and 2-bromo-1,1-diethoxyethane (24.5 ml, 0.163 mol) were added and the mixture was heated to reflux for 24 h. The cooled mixture was washed with water (300 ml) and separated. The water layer was back extracted with diethyl ether (3 × 100 ml). The combined organic extracts were washed with brine (3 × 100 ml) and dried twice over anhydrous Na2SO4. The solvents were removed in vacuo and the residue was distilled under vacuum (50°C, 4·10-3 mbar). Yield 6.46 g (34%).

Author's Comments

This is an intermediate in the synthesis of BEDT-TSF (BETS).


1H NMR (400 MHz, 298K, CDCl3) δH 6.04 (s, 2H, CH), 3.14 (s, 4H, CH2)

13C NMR (101 MHz, 298K, CDCl3) δC 114.39 (CH), 26.30 (CH2)

Lead Reference

T. Courcet, I. Malfant, K. Pokhodnia and P. Cassoux, New J. Chem., 1998, 22, 585-589

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Keywords: addition, alkenes, alkyl/alkenyl/aryl halides, BEDT-TSF, BETS, bisethylenedithiotetraselenafulvalene, elimination, ethers, heterocyclic compounds, nucleophilic, reduction, substitution, sulphides

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