Trimethylene and 1 : 3-butylene sulphites are hydrolysed in alkaline solution a t rates which can be followed by conventional techniques at 0". The reactions are of the second kinetic order, and have the same rates whether measured by the uptake of alkali or the liberation of sulphur dioxide. The possible intermediate (e.g., HO*CH,*CH,*CH,*O-SO,H or its anion) does not build up to high concentration during reaction. Alkyl substitution in the carbon chain seems to have little effect on the rate of alkaline hydrolysis, but 1 : 2-sulphites are in this process very much more rapidly hydrolysed. These results, in conjunction with studies of bond-fission (Part I) allow comparison with the corresponding data for acid-catalysed hydrolysis (Part 11). In the latter reaction also, the possible intermediate does not build up in concentration; and alkyl substitution in the carbon chain has little influence on the rate, which now is little changed when the ring-size is altered.THE detailed courses of hydrolyses of cyclic sulphites, and the kinetic effects of structural changes, are considered. In contrast to the acid-catalysed hydrolyses of cyclic sulphites discussed in Part 11, those in alkaline solution are very rapid. Possible stages in the reaction (e.g., of trimethylene sulphite) are as follows:* Parts I and 11, preceding papers.
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