N-(1,2-Dihydro-2-oxoquinolin-1-yl)-N-(1-methylallyl)-4-chlorobenzenesulphenamide (5) has previously been isolated in two stereoisomeric forms. From examination of a number of analogues of (5), it is concluded that the phenomenon which allows isolation of these stereoisomers is restricted rotation around the N–N bond.
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Atkinson et al. (1979) studied this question.