Aldehyde benzoic

Chemical Designations - Synonyms Benzoic Aldehyde, Oil of Bitter Almond Chemical Formula C HjCHO. 

Benzoic aldehydes mainly cover syringaldehyde and vanillin. Natural vanilla is prepared from the seeds (beans) of Vanilla planifolia, which may contain about 21 mg/ 100 g FW total phenols, including the major components vanillin (19.4 mg/100 g FW), 4-hydroxybenzaldehyde (1 mg/100 g FW), and vanillic acid (0.4 mg/100 g FW) (Clifford 2000b). In mango, vanillin has been found as free as well as vanillyl glu-coside (Sakho and others 1997). It has also been found in lychees (Ong and Acree 1998) and wines (Moreno and others 2007). For analysis of both brandy and wine aged in oak barrels, the limits of detection were found to be 27.5, 14.25, 14.75, and... 

Benzoic aldehydes Syringaldehyde Ripe walnut fruit... 

Aldehydes derived fiom the CflHs, jHo series of alcohols. 206 Benzoic aldehyde or oil of bitter almonds.206... 

Beoetions.—1. When exposed to the air, benzoic aldehyde absorbs oxygen and is converted into benzoic acid — (ggg H. 0... 

Wines stored in vats lined with epoxy resins can present unusually high levels of benzoic aldehyde (several mg/L). Benzylic alcohol is both a plasticizer and diluent of these resins. Its conversion into benzaldehyde can be due (Blaise 1986) to the action of an exocellular enzyme of Botrytis cinerea called Alcohol Benzylic Oxidase (ABO, E.C. 1.1.3.7.) responsible for this oxidation process (Blaise and Brun 1986). 

SYNS ALMOND ARTIFICIAL ESSENTIAL OIL ARTIFICIAL ALxMOND OIL BENZENECARB-ALDEHYDE BENZENECARBONAL BENZOIC ALDEHYDE FEMA No. 2127 NCI-C56133... 

Benzyl Alcohol.—The simplest aromatic alcohol is the hydroxyl derivative of toluene and is known as benzyl alcohol, CeHs—CH2—OH. The radical, (CeHs—CH2—), is termed benzyl as in the alcohol and chloride above. The alcohol occurs as an ester in Peru balsam, in storax, a resin obtained from a plant sty rax, and in Tolu balsam from which the mother hydrocarbon toluene derives its name. On hydrolysis of the balsam benzyl alcohol is obtained. It is a liquid, b.p. 206.5°, slightly soluble in water and soluble in alcohol or ether. It may be prepared by those syntheses just given which yield primary alcohols. It may also be prepared by the reduction of the corresponding aldehyde, known as benzoic aldehyde or benzaldehyde (p. 655). On oxidation it yields the aldehyde and then an acid, benzoic acid. 

Trinitrotoluene 2,4,6-Trinitrotoluene Benzaldehyde Benzoic aldehyde Benzoic acid Catechaldehyde... 

The leadership position of NBO masks the difficulties of the method, such as its susceptibility to moderate experimental changes. As shown in Table 2.1, which reports on an interlaboratory comparative evaluation of lignin degradative analyses [20], the yield of monomeric products may differ to a very large extent, with a 20 to 30% standard deviation. This poor interlaboratory reproducibility may originate both from variations in reaction duration or temperature [21] and from analytical difficulties. After completion of the reaction, the classical procedure involves elimination of excess nitrobenzene and its reduction products from the alkaline reaction mixture this is followed by the acidification of the hydrolysate, the extraction of the benzoic aldehydes and acids and their HPLC or GC analysis [16]. The possibility of incomplete extraction [22,23], as well interference from residual nitrobenzene derivatives [23], is often overlooked. 

Yield of H, G, and S Monomers (Benzoic Aldehydes and Acids) Released by Nitrobenzene Oxidation (160°C, 3 Hours, 5 ml 2M NaOH, 0.5 ml Nitrobenzene, 25 mg Sample) of Wheat Straw Samples. Yields are Expressed in pmoles/g of Klason Lignin for the Extractive-Free Wheat Straw Before and After Mild Alkaline Hydrolysis (2M NaOH, 37°C, 2 Hours)... 

C.39) (C.39) Benzaldehyde, benzaldehyde, benzoic aldehyde, benzenecarboxaldehyde, phenylmethanal (100-52-7] FEMA 2127... 

Benscyllo alcohol—Benzoic alcohol—Benzgl hgdrale—C,H (CH OH) —108—does not exist in nature, and is of interest chiefly as corresponding to two important compound benzoic acid and benzoic aldehyde (oil of bitter almonds). It ia obtained by the action of potassium hydrate upon oil of bitter almonds, or by slowly adding sodium amalgam to a boiling eolution of benzoic add. 

Benzoic aldehyde—Benzoyl hydride—(COH)—106—is the main constituent of oil of bitter idmonds, although it does not exist in the almonda (see p. 329) it is formed, along with hydrocyanic acid and glu-0060, by the action of water upon amygde n. It io also formed by a number of general methods of producing aldehydes by the dehydration of... 

It is obtained from bitter almonda The crude oil contains, besides benzoic aldehyde, hydrocyanic and benzoic acids and cyanobenzoyl to purify it, it is treated with three to four times its volume of a concentrated solution of sodium bisulphite the crystalline mass is expressed, dissolved in a small quantity of water, and decomposed with a concentrated solution of sodium carbonate—the treatment being repeated, if necessary. 

Nitro-benzoi may be distinguisbed from oil of bitter almonds (benzoic aldehyde) by LSO which does not color the former and by the action of acetic acid amd iron filings, which oonvert nitro-benzol into aniline, whose presence is detected by the reactions (or that aubetauoe (9. i .). 

BENZOIC ALDEHYDE, OS of Bitter AUmndt, Hydride of Btntoyl. 

Pongratz (103), Sosin (104), and Dolgov (105) suggest that the oxidation of aromatics to phthalic and benzoic aldehydes proceeds in steps. For example, naphthalene is converted into naphthol, then to naphthahydroquinone, to phthalic anhydride, and, eventually, to C02. Thus optimal conditions for fast elimination of oxygen-containing compounds from the reaction zone are usually sought for in the attempts to obtain products of low conversion. 

It is a colorless liquid boils at 206°.5 (403°.7 F.) has an aromatic odor is insoluble in water, soluble in all proportions in alcohol, ether, and carbon disulfid. By oxidation it yields, first, benzoic aldehyde, C Hi(COH) and afterward, benzoic acid, CaHeiCOOH). By the same means it may be made to yield products similar to those obtained from the alcohols of the saturated hydrocarbons. 

---