Das N‐Vinyl‐octahydrocarbazol (I) reagiert mit Phosphorpentachlorid unter starker Harzbildung zu dem Hexachlorophosphat (II), das mit Schwefeldioxid in das Phosphonsäurechlorid (III) übergeht.
Reaction of N,N'‐dimethylurea (I) with the acyl chlorides (II) yields the N‐acyl‐N,N'‐dimethylureas (III) which are coupled with PCl5 (IV), forming the cyclic phosphonium salts (V).
Symmetrische (IIIa) bzw. (IIId) und unsymmetrische (IIIb) bzw. (IIIc) Bis‐(organylthio)‐acetylene werden mit PCl5 umgesetzt, wobei die entsprechenden Hexachlorphosphate wie (IV), (V) oder (VI) gebildet werden.
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