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It is suggested that the facile low-temperature solid-state inter-conversion of the CC-and P-phases of 5-methyl-1 -thia-5-azoniacyclo-octane 1 -oxide perchtorate occurs on recurrent (1 02) type planes. The mechanism, which is likely to be of general validity in organic solid-state chemistry, dispenses with the need to postulate co-operative conformational changes on half of the molecular cations (mol-ions) in each row and in each column, and also explains all the known experimental facts relating to the transition.

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