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• 103-82-2 phenylacetic acid 
• 7089-34-1 ((Z)-3-Dimethylamino-2-phenyl-allylidene)-dimethyl-ammonium; perchlorate 
• 1878-68-8 2-(4-bromophenyl)-acetic acid 
• 62084-97-3 2,3-dihydro-6-phenyl-1,4-diazepinium perchlorate 

Relevant academic research and scientific papers

Diazepines, 27. - Effects of Substituents on the Bromination of 2,3-Dihydro-1,4-diazepinium Salts

Bromination at the 6-position of 2,3-dihydro-1,4-diazepinium salts 1 or at the p-position of a 6-phenyl substituent is subject to steric hindrance, not only by substituents at vicinal sites in the ring(s), but also by substituents at the 1-, 2-, and 4-positions.

Diazepines. Part 25. Preparation and Properties of 6-Aryl-2,3-dihydro-1,4-diazepinium Salts. Electronic Interaction between the Rings and Steric Inhibition thereof

A variety of 6-aryldihydrodiazepinium salts (including also 6-biphenyl-4-yl, 6-α-naphthyl, and 6-N-pyridyl) has been prepared, mostly by reactions of 1,2-diamines with 3-aryl-1,5-diazapentadienium salts.The electron-rich dihydrodiazepinium cation activates the 6-aryl substituent towards electrophilic attack, and halogenation and nitration take place at the p-position.Substituents vicinal to the ring junction in either the six- or seven-membered rings inhibit this reactivity, presumably by preventing coplanarity of the two rings; the 13C n.m.r. spectra of these vicinally substituted compounds also show the lowered electronic interactions between the rings.NN'-diphenyl and NN'-dibenzyl substituents also inhibit electrophilic substitution in the 6-phenyl ring.Solution in deuteriosulphuric acid generates a stable radical species.Nucleophiles (monoamines, diamines, sodium hydroxide) attack the 5- and 7-positions of the diazepine ring.The 13C n.m.r. and mass spectra of these compounds are discussed.