Ueber unsymmetrische Phenylhydrazinverbindungen

Abstract

nay m m. P h eny 1 h y d r az i d o ace t d i m e t h J 1 -pp h e n y 1 end i am in.

A Facile Entry for Synthesis of 3-arylazo Derivatives of [1,2,4]Triazolo[4,3-a] Benzimidazole and [1,2,4]Triazolo[3,4-b]Quinazolin-5-one

“…On the basis of spectral (MS, IR and 1 H NMR) (see Experimental) and elemental analyses, the products isolated from the reactions of 2 with 1a-f were assigned the 3-arylazo [1,2,4] triazolo [4,3-a]benzimidazole structures 6a-f, respectively (Scheme 1). Such structure assignment was substantiated by 13 C NMR spectra. For example, the 13 C NMR spectrum of 6a reveals, as expected, 18 signals.…”

“…Such structure assignment was substantiated by 13 C NMR spectra. For example, the 13 C NMR spectrum of 6a reveals, as expected, 18 signals.…”

“…The starting reagents 3-chloro-1,5-diarylformazans 1, 1 2-mercaptobenzimidazole 2, 11 its 2-methylthio-derivative 3, 12 2,3-dihydro-2-thioxoquinazolin-4(1H)-one 4 13 and its 2-methylthio derivative 5 14 were prepared by known methods.…”

Reaction with Hydrazonoyl Halides 64: Synthesis of Some New Triazolino[4,3‐a]pyrimidines, 1,3,4‐Thiadiazoles, and 5‐Arylazothiazoles

“…Similarly, reactions of 2‐thioxo‐2,3‐dihydro‐1 H ‐quinazolin‐4‐one , 2‐mercaptobenzimidazole, and 2‐thioxo‐2,3,5,6,7,8‐hexahydro‐1 H ‐benzo[4,5]thieno[2,3‐ d ]pyrimidin‐4‐one with hydrazonoyl bromide 4 were carried out in refluxing chloroform by triethylamine gave [1,2,4]triazolo[3,4‐ b ]quinazolin‐5‐one 12 , 1 H ‐benzo[4,5]imidazo[2,1‐ c ][1,2,4]triazol‐3‐yl)‐methanone 13 , and 1,2,3a,10‐tetraaza‐cyclopenta[ b ]fluoren‐4‐one 14 , respectively (Scheme ).…”

Intramolekulare Umsetzung von Iminiumverbindungen mit Carbonsäuren

“…( (2), 221 (9), 165 (11), 164(100), 133(33), 132(86), 119 (14), 105(24), 104 (22), 92 (19), 78(18), 77(81). IR (CHCI,): 3377,2940(CHCI,): 3377, ,2863(CHCI,): 3377, ,2735(CHCI,): 3377, , 1725(CHCI,): 3377, ,1680(CHCI,): 3377, , 1609(CHCI,): 3377, ,1583(CHCI,): 3377, , 1516(CHCI,): 3377, , 14.59, 1438(CHCI,): 3377, ,1327, (2), 146(4), 132(9), 120(10), 107(9), 106 (12), 104(5), 91(2), 77 (4). IR(KBr): 3365,3058,2938,2850,1678,1596,1580,1519,1510, 1502, 1474, 1433, 1387, 1370, 1330, 1318, 1260, 1238, 1169, 750, 742, 691cm- …”