Nitro benzaldehyde

Cohn 1 instanced a similar phenomenon in the similarity of the odours of, benzaldehyde, nitro-benzene, benzonitrile, azimidobenzene, and phenyldi-imide. He developed the osmophore theory and introduced the terms kakosmophore and enosmophore to indicate those groups which impart an upleasant and a pleasant odour respectively. The kakosmophore groups are —... 

The method is of great value in dealing with substances which are sensitive to strong acids or bases, such as o-nitro- and amino-benzaldehydes, nitro- and amino-benzamides and benzoylureas, and is also of service in the preparation of other ammo acids. 

As recently as 1998, Zhou et al. [445] analyzed the widely varying uptakes of substituted benzenes and phenols (nitrobenzene > benzaldehyde > nitro-4-phenol > 4-cresol > phenol > aniline) using models such as those of Langmuir, Freundlich, and preferably—when the solute concentration range was large— Redlich-Peterson and Jossens-Myers, in which the parameters are not related to the properties of the adsorbent instead, they are related to the solubility and the Hammett constant of the solutes (.see Section IV.B.2). 

Nitro-3-raethoxy-2- thoxy-benzaldehyd-[ nitro-phenylhydrazon] 16 II 204. 

Physical Properties. Nitrobenzene, C HjNOj pale yellow liquid, insoluble in and heavier than water, characteristic odour of bitter almonds, (similar to that of benzaldehyde and benzonitrile). /> Nitro toluene, C,H4(CH3)N02, usually pale yellow solid, insoluble in water, m-Dinitrobenzene, C8H4(N02)g, colourless solid when pure, but often pale yellow insoluble in water. 

Nearly all of the benzal chloride produced is consumed in the manufacture of benzaldehyde. Benzaldehyde (qv) is used in the manufacture of perfume and flavor chemicals, dyes, and pharmaceuticals. The principal part of benzotrichloride production is used in the manufacture of benzoyl chloride (see Benzoic acid). Lesser amounts are consumed in the manufacture of benzotrifluoride, as a dyestuff intermediate, and in producing hydroxybenzophenone ultraviolet light stabilizers. Benzotrifluoride is an important intermediate in the manufacture of herbicides, pharmaceuticals, antimicrobial agents, and the lampreycide, 4-nitro-3-(trifluorometh5l)phenol [88-30-2]. 

Pyrrolo[2,3-6]pyridine, 6-methyl-reaction with aldehydes, 4, 503 reaction with benzaldehyde, 4, 511 Pyrrolo[2,3-6]pyridine, 7-methyl-hydrogenation, 4, 508 Pyrrolo[2,3-6]pyridine, 3-nitro-2-phenyl-reduction, 4, 511 Pyrrolo[2,3-6]pyridine, 2-phenyl-nitrosation, 4, 506 quatemization, 4, 503 synthesis, 4, 522... 

These have been reviewed in an earlier volume. -Nitro-benzaldehyde has also been prepared in 32% yield by heating /)-nitrobenzyl chloride with potassium fer/-butylperoxide. The... 

In 1972, van Leusen, Hoogenboom and Siderius introduced the utility of TosMIC for the synthesis of azoles (pyrroles, oxazoles, imidazoles, thiazoles, etc.) by delivering a C-N-C fragment to polarized double bonds. In addition to the synthesis of 5-phenyloxazole, they also described reaction of TosMIC with /7-nitro- and /7-chloro-benzaldehyde (3) to provide analogous oxazoles 4 in 91% and 57% yield, respectively. Reaction of TosMIC with acid chlorides, anhydrides, or esters leads to oxazoles in which the tosyl group is retained. For example, reaction of acetic anhydride and TosMIC furnish oxazole 5 in 73% yield. ... 

Cohn points out that position isomerism is of the greatest importance as regards the odours of isomerides, this is strikingly instanced in the case of the tri-nitro tertiary butyl xylenes since the only one possessing the powerful musk odour is that in which the nitro groups are situated each in the meta position to the two others again the ortho-amido-benzaldehyde has a strong odour but the meta and para isomerides are odourless. 

In 212 cc of water are mixed 21.2 grams (0.112 mol) of N-(benzylidene)-3-amino-2-oxa-zolidone, 8.93 grams of concentrated sulfuric acid, and 30.1 grams (0.124 mol) of 5-ni-tro-2-furaldehyde diacetate. This mixture is heated to effect the hydrolysis of N-(benzy-lidene)-3-amino-2-oxazolidone, steam distillation of the benzaldehyde and hydrolysis of 5-nitro-2-furaldehyde diacetate. Approximately IV2 hours are required for this reaction to take place. When the bulk of the benzaldehyde has been removed, 50 cc of 99% isopropanol are added, the reaction mixture is refluxed a short time, and the crystals of N-(5-nitro-2-furfurylidene)-3-amino-2-oxazolidone are filtered from the hot suspension. The product is washed with water and isopropanol and dried a yield of 23.3 grams, 92.8% based on N-(benzylidene)-3-amino-2-oxazolidone of MP 254° to 256°C is obtained, according to U.S. Patent 2,759,931. 

Benzaldehyde, o nitro, 46,81 Benzaldehyde, 2,4,6-trimethyl-, 47,1 Benzaldehydes, halogen- and methyl-substituted, preparation from diazomum salts and formal doxime, 46, IS... 

Double metalation of the protected (2/ .3S)-4-nitro-l, 2,3-butanetriol 4 and addition of benzaldehyde furnished, after removal of the protecting groups, a single crystalline diastereomer. The absolute configuration of the newly formed asymmetric carbons is assumed to be cither (4R,5S) or (4S,5R)ls. 

Miscellaneous Identified Inhibitors. 3-Acetyl-6-methoxy-benzaldehyde is present in the leaves of the desert shrub Encelia farinosa. It is apparently leached from the leaves and washed into the soil by rain. Concentrations of approximately 0.5 mg. per gram of dried leaf material have been measured. In sand culture studies, growth of tomato seedlings was inhibited by 50 p.p.m. while 115 p.p.m. reduced growth by 50% (53). A concentration of 250 p.p.m. killed the test plants within one day. The structure was confirmed by synthesis, and the synthetic material was shown to be as active as the natural product (54). Derivatives were also prepared in which a cyano, nitro, or amino group was substituted for the aldehyde moiety. The amino derivative was reported to be the most highly toxic. 

Dimethylsulfan-Boran reduziert 4-Nitro-benzoylchIorid zu 4-Nitro-benzaldehyd (60% d.Th.)5. 

Formyl-cyclohexan 4-Chlor-benzaldehyd 4-Nitro-benzaldehyd Zimtaldehyd... 

Je nach Bedingungen kann auch Hexaathyl-disiloxan entstehen. Die bei 20° ablaufende Reaktion ist stark strukturabhangig. Elektronenliefernde Substituenten fordern, elektro-nenanziehende erschweren die Reduktion. So wird 4-Nitro-benzophenon z.B. erst inner-halb 47 Stdn. zu 4-Nitro-diphenylmethan reduziert, wahrend 4-Nitro-benzaldehyd und -acetophenon nicht bis zu Kohlenwasserstoffen reduziert werden. 

Auf ahnliche Weise erhalt man aus 2-Nitro-benzaldehyd in waBrig-alkoholischer Ace-tatpuffer-Losung Benzo-[c]-l,2-oxazol (51% d.Th.)1 ... 

Tin(II) chloride reduces aromatic nitro compounds to the corresponding amines, these then react with 4-(dimethylamino)-benzaldehyde to yield colored Schiff s bases. 

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