5-Nitro-7-phenyl

Unlike ynamines, ethyl vinyl ether requires the more electron-deficient 4-nitro-2-phenyl-5-oxazolecarboxylic acid methyl ester 271b for reaction to occur. The initial [4 + 2] cycloadduct 279 undergoes further reaction with ethyl vinyl ether to give the tricyclic oxazoline 280 in 76% yield (Scheme 8.79). [Pg.410]

CII2-CfiII, 4-Nitro- /-[(2-phenyl-acetamino)-methyl -... 80-95 250... [Pg.343]

There has been some interest in the chemistry of aminonitroazoles when used as high energetic compounds. Data concerning direct introduction of the amino group into the nitroazole cycle have been absent in the literature till the present time. We have studied the vicarious nucleophilic substitution of l-methyl-4-nitropyrazole and also l-mcthyl-4-nitroimidazole (Table 3.10), 4-nitro-2-phenyl-1,2,3-triazole (Table 3.24), and nitrobenzimidazoles (Table 3.25) under the effect of 1,1,1-trim-ethylhydrazinium halides and 4-amino-1,2,4-triazole by NMR spectroscopy (DMSO-<76) (Scheme 3.5) [220, 272-278] ... [Pg.197]

The interesting intermediates, the areneoxenium ions 17, are believed to be involved when phenol derivatives which are connected with a good electron accepting leaving group, such as the 4-methoxypyridinium tetrafluoroborate (16), are thermo-lysed. 2-Nitro-dibenzofurane (18) (22%) and 4-nitro-2-phenyl-phenol (19) (24.8%) have been isolated 207). [Pg.156]

Nitro- -methylester 605 4-Nitro-3-phenyl-2-acetyl- -athylester 502 4-Nitro-2-phenyl- -athylester 505 4-Oxo- 469... [Pg.822]

Nitn>-t-phenyl-indMol 28 1 34. 4-Nitro-2-phenyl-indazol 28 1 34. x-Nitro-[2-phenyl-mdaail] vom Schmelz ... [Pg.730]

Protecting reagent for -NHj group in solid-phase peptide synth. Reagent for characterisation of alcohols. N-Phenylimide [19065-85-1]. 4-Nitro-2-phenyl-l -isoindole-l,3 2H) dione, 9CI. 3-Nitrophthalanil C14H8N2O4 M 268.228... [Pg.728]

Nitrophenyl)hydrazine, N-OOl38 4-Nitro-2-phenyl-1 //-isoindole-1,3(2//)-dione,... [Pg.1042]

B.P. Alkylldene Dlmedone (I) Dimedone "Anhydride" (M) 2 4-Dinltn>-phenyl-hydnzone Seml- earbazone />-NItro- phenyl- hydrazone Other Derivatives Cd ss... [Pg.334]

Compounds containing a double or triple bond, usually activated by additional unsaturation (carbonyl, cyano, nitro, phenyl, etc.) In the ap position, add to the I 4-positions of a conjugated (buta-1 3-diene) system with the formation of a ax-membered ring. The ethylenic or acetylenic compound is known as the dieTwphile and the second reactant as the diene the product is the adduct. The addition is generally termed the Diels-Alder reaction or the diene synthesis. The product in the case of an ethylenic dienophile is a cyctohexene and in that of an acetylenic dienophile is a cyctohexa-1 4-diene. The active unsaturated portion of the dienophile, or that of the diene, or those in both, may be involved in rings the adduct is then polycyclic. [Pg.941]

Phenylbenzimidazole is nitrated first at the 5-position with mixed acid, and subsequent reaction produces 5-nitro-2-(4-nitrophenyl)-and 5-nitro-2-(3-nitrophenyl)-benzimidazole. 2-Phenyl-, 2-(4-nitro-phenyl)- and 5-nitro-2-phenyl-benzimidazole are nitrated as their conjugate acids. ... [Pg.218]

Three selective methods to remove protective groups are receiving much attention assisted, electrolytic, and photolytic removal. Four examples illustrate assisted removal of a protective group. A stable allyl group can be converted to a labile vinyl ether group (eq. 4) a /3-haloethoxy (eq. 5) or a /3-silylethoxy (eq. 6) derivative is cleaved by attack at the /3-substituent and a stable o-nitro-phenyl derivative can be reduced to the o-amino compound, which undergoes cleavage by nucleophilic displacement (eq. 7) ° ... [Pg.2]

Radicaloid substitution has not been extensively studied in the thiophene series. Molecular orbital calculations indicate that substitution should occur in the a-position. This has been found to be the case in the Gomberg-Bachmann coupling of diazohydroxides with thiophenes which has been used for the preparation of 2-(o-nitro-phenyl) thiophene, 2-(p-toluyl) thiophene, " " and 2-(p-chloro-phenyl)thiophene. " Coupling in the /8-position has been used for the preparation of 1,3-dimethyl-4,5-benzisothionaphthene (148) from 2-amino-tt-(2,5-dimethyl-3-thienyl)cinnamic acid (149). A recent investigation describes the homolytic phenylation of 2- and 3-phenyl-... [Pg.68]

N-(p-Dimetliylaminophenyl)-Qr-(o-nitro-phenyl)nitrone from reaction of o-nitrobenzylpyridinium bromide and -nitrosodimethylaniline, 46, 82... [Pg.127]

Nitro(phenyl)methanone 2-nitrophenylhydrazone (1 2.4 g, 8.4 mmol) in aq MeOH was hydrogenated at atmospheric pressure in the presence of Raney nickel. The catalyst was filtered off and air was passed through the filtrate to yield the product yield 1.34 g (72%) red needles mp 118 C (MeOH containing a trace of Nll3). [Pg.478]

Picrolonic Acid [l-(4-Nitro-phenyl)-4 nitro-3-methyl-Pyrazolone-(5)]. [Pg.773]

Phenyl-2-(4-nitro-phenyl)-2-deuterio propansdure- met hy tester1... [Pg.210]

D-threo-2-Amino-3-hydroxy-3- — v-threo-2-Amino-1 - (4-nitro-phenyl)-propan-diol-( 1,3)4 ... [Pg.212]

COOC2H5 HN-Z — 2-Thiono-4-hydroxymethyl- 5-(4-nitro-phenyl)-I,3-thiazo-lidin6 91% d.Th. F 139-143°... [Pg.213]

Nitro-bcnzocsaure- -a Dirnethyl-(4-nitro-phenyl)-amm1 84"/, d.Th. Kp,., 96-98 ... [Pg.238]

D-(-)-threo-2-Dichloracetylamlno-l-(4-nitro-phenyl)-propandiol-(l,3) (Chloramphenicol)1 Zu 1500 ml... [Pg.264]

Nitro-phenyl)-butanol-(2) — 2-(4-Nitro-phenyl)-butan 100%d.Th. [Pg.412]

Dimethyl-4-(3-chlor-2-nitro-phenyl)-3-athoxy carbonyl-pyrrol4 ... [Pg.454]

Nitro-phenyl)-aerylsaureester und -propansaureester reagieren mit Natriumboranat in Gegenwart von Palladium/Kohle als Katalysator zu cyclischen Hydroxamsau-ren mit Chinolin-Struktur z.B. ... [Pg.476]

Phenyl-thiocyanat kann in alkoholischcr 2 n Schwefelsaure in Thiophenol iiberfiihrt werden (Blei-Kathode). (Nitro-phenyl)-cyan-sulfide ergeben neben etwas Amino-thio-phenol iiberwiegend dimere und heterocyclische Verbindungen (s. S. 687) ... [Pg.635]

Bei der Elektrolyse von 2-Nitro-benzylhalogeniden in Acetonitril wird als Hauptprodukt 1,2-Bis-[2-nitro-phenyl]-dthan gebildet3. Auch Brom-maleinsaure gibt pH-abhan-gig (in waBrigen Pufferlosungen) neben Maleinsaure betrachtliche Mengen an3,4-Dicarb-oxy-2,4-hexadiendisaure (vgl. S. 641)4. [Pg.667]

Zur Reduktion von l-(2-Nitro-phenyl)-alkenen zu l-(2-Hydroxylamino-phenyl)-alkenen (Zwischenstufe) s.S. 698. [Pg.683]

Auch l-(2-Nitro-phenyl)-alkene geben in 0,5n-athanol. Schwefelsaure 4-Amino-3-[alken-( 1 )-yl]-pheno e (zur Indol-Synthese)4. Auch 5-Nitro-isochinolin kann so zu 5-Amino-8-hydroxy-isochinolin reduziert werden5. Analog erhalt man aus 4-Nitro-ben-zotriazol an Platin/konzentrierter Schwefelsaure 4-Amino-7-hydroxy-benzoiriazoP. [Pg.684]

Zur Reduktion von Bis-[2-nitro-phenyl]-sulfan (S. 695), 4-Nitro-1 -phenylthioazo-ben-zol (s.S. 700) und zur Hersteliung von3-Amino-benzolsulfonsaure aus 3-Nitro-benzolsul-fonsaure im FlieGbett-2 oder Wirbelsehicht-Zellen3 s.Lit. [Pg.686]

Mit fiber 90% Ausbeute lassen sich aus (2-Nitro-phenyl)-essigsaure, -glykolsaure bzw. -glyoxylsaure in 1 n Schwefelsaure/Athanol (1 1) an Quecksilber bei—0,4 V cycli-sche Hydroxamsauren herstellen (bei negativerem Potential werden daneben bis zu 20% d.Th. Lactame gebildet)2 ... [Pg.689]

Analog reagieren (2-Nitro-phenoxy)-, (2-Nitro-phenylthio)-essigsauren bzw. 3-Oxo-3-(2-nitro-phenyl)-propansauren2 ... [Pg.689]

Oxo-3-(2-nitro-phenyl)-propansaure wird ebenfalls cyclisiert2 ... [Pg.690]

In alkoholischer Acetatpuffer-Losung konnen 2-Nitro-l-(2-nitro-phenyl)-athanole bei -0,5 V zur Hydr-oxylamin-Verbindung I und bei - 1,2 V zum Bis-hydroxylamin reduziert werden. Der RingschluB zum Cinnolin wird durch Luftsauerstoff verursacht1 ... [Pg.694]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...