Aniline hydrochloride, III

In situ oxidative polymerization has also been used to prepare/PE/poly-aniline composites. In one approach, microporous PE films were immersed in a solution of aniline hydrochloride and polymerization was started by the introduction of ammonium peroxydisulfate [23]. Similarly, Wan and Yang (1993) obtained PE/polyaniline composites using iron (III) chloride as the oxidant [24]. Solution blending is largely utilized to prepare blends and composites where one or more of the components do not melt easily or are heat susceptible. ICPs Hke polyanifine are difficult to process due to their aromatic structure, interchain hydrogen bonds and effective charge delocahzation in their structures. 

The reaction of 7V,7V-bis(phenacyl)anilines 701 with hydrazine hydrochloride in EtOH or ethylene glycol under reflux leads to the formation of 1,2,5-triazepines 702 (Scheme 303) <2007JHC133, CHEC-III(13.15.7.1)454>. 

The best known of these is the ozonation of tertiary amines to amine oxides (II) (i). Henbest and Stratford (11) and Shulman (17) have shown that competing with this is an ozone attack on the alpha position of an alkyl side chain to produce various decomposition products of III. Henbest (11) showed that amine oxide formation is favored in chloroform and methanol, while side chain oxidation is predominant in hydrocarbon solvents. Also of considerable interest are the reported conversions, during ozonation, of phenylenediamines to Wursters salts (VII) (8, 14), of liquid ammonia to ammonium ozonate (VA) at a low temperature 18), and of amines to amine hydrochlorides (VB) in chlorinated hydrocarbon solvents 17, 19), Finally, an early report states that azobenzene and quinone are obtained upon ozonation of aniline (15). 

Chloropilocarpic acid (III, R = H) may be an intermediate in the formation of the so-called pilocarpine anil, C17H21ON3 (IV), by heating pilocarpine hydrochloride with aniline at 205-210° (54). This substance is not formed when pilocarpine base is heated with aniline. 

A mechanism of osazone formation utilizing the same intermediate (III) as the Weygand-Reckhaus mechanism (I-VII) has been proposed by Bloink and Pausacker The key step may be the formation of a cyclic transition state (III ) between the intermediate (III) and a molecule of phenyl-hydrazine hydrochloride which is reductively cleaved to yield the osazone (VIP) directly as well as ammonia and aniline simultaneously. 

---