a Howe and McQuillin (J., 1966, 2670) showed that prior isomerisation of 1 : 1-disubstituted olefins to tetrasubstituted olefins takes place in the addition of hydrogen to some 6-epicyperone compounds. Replacement of allylic hydrogen by deuterium occurs in the deuteration of A'-steroids (Fukuchima and Gallagher, J . Amer. Chem. Soc., 1965, 77, 139). The observations are also explicable in terms of the initial formation of allylic carbonium ion-catalyst complexes.
Die Oxoverbindungen (I) reagieren über die Guanylhydrazone (II) durch Hydrierung zu den Aralkylaminoguanidinen (III), die auch aus den Hydrazinen (VI) mit den S‐Methylisothiuroniumsalzen (IV) erhalten werden.
Das Dibromid (I) reagiert mit den Thioharnstoffen (II) zu den Isothiuroniumsalzen (III); im Falle der N,N′‐Dialkylthioharnstoffe (IIb) und (IIc) werden daneben auch die Bis‐Produkte (VIa) bzw. (VIb) gebildet; bei den cyclischen Thioharnstoffen (IId), (IIe) entstehen solche Bis‐Produkte (VIc), wenn überhaupt, nur in geringer Menge.
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