The reaction between bischloromethyl ether and sodium sulphide gives linear formaldehyde–thioformaldehyde copolymers, with CH2S/CH2O ratios ranging from 1 to 4, and the two new cyclic co-oligomers, 1,3,5,7,9-oxatetrathiacyclodecane and 1,3,5,7,9,11-oxapentathiacyclododecane.
L. Mortillaro, M. Russo, L. Credali and C. De Checchi, J. Chem. Soc. C, 1966, 428 DOI: 10.1039/J39660000428
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