Noah Vinter
Nitroalkanes are organic compounds that contain one or more nitro functional groups (-NO2). They are formed when one of the hydrogen atoms of an alkane is replaced by a nitro group. Nitroalkanes are used in the manufacturing of oils, fats, shellac, and cellulose derivatives as solvents. They also serve as valuable nucleophiles in Michael reactions due to their inherent reactivity. Primary nitroalkanes undergo hydrolysis when heated with sulphuric acid, while secondary nitroalkanes give tars under these conditions, and tertiary nitroalkanes do not react. On the other hand, β-nitro alcohols are formed when primary or secondary nitroalkanes react with aldehydes or ketones.
| Characteristics | Values |
|---|---|
| Definition | Nitroalkanes are alkane derivatives in which a nitro group replaces one or more hydrogen atoms. |
| B-nitro alcohols are formed when primary or secondary nitroalkanes react with aldehydes or ketones. | |
| Formation | Nitroalkanes are formed when haloalkanes are treated with alcoholic AgNO2 or when alkanes are heated with fuming nitric acid at 450°C. |
| B-nitro alcohols are formed when primary or secondary nitroalkanes react with aldehydes or ketones. | |
| Reactivity | Tertiary nitroalkanes do not react. |
| Primary and secondary nitroalkanes are reactive. | |
| Uses | Nitroalkanes are used as solvents in the production of oils, fats, shellac, and cellulose. |
| B-nitro alcohols were not mentioned in the sources provided. |
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What You'll Learn
Primary nitroalkanes
Nitroalkanes are organic compounds that contain one or more nitro functional groups (-NO2). They are valuable nucleophiles in Michael reactions due to their inherent reactivity and the potential transformations made possible by the nitro group. Nitroalkanes are also known as nitroparaffins and are classified as primary, secondary, and tertiary nitroalkanes.
The active α-hydrogens in primary nitroalkanes can be replaced by a halogen, similar to the process observed in carbonyl compounds. This reaction is facilitated by an alkaline solution. Chloropicrin (CCl3·NO2) is an example of a toxic compound produced through this reaction, which is used as a soil sterilizing agent.
Dehydration of primary nitroalkanes with phenyl isocyanate or acetic anhydride, in the presence of a base such as triethylamine, leads to the formation of nitrile oxides. This reaction, known as "Mukaiyama's method," is widely used but has some drawbacks, including the formation of diaryl urea as a side product and the need for high temperatures or prolonged reaction times.
Nitrile oxides can also be generated from primary nitroalkanes using 4-(4,6-dimethoxy[1,3,5]triazin-2-yl)-4-methylmorpholinium chloride, with or without microwave radiation. This procedure has been applied in solid-phase synthesis.
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Secondary nitroalkanes
Nitroalkanes are organic compounds that contain one or more nitro functional groups (-NO2). They are valuable nucleophiles in Michael reactions due to their inherent reactivity and the potential transformations of the nitro group. Nitroalkanes can be prepared from alkyl halides using metal nitrites as the nitro-group source. Silver, sodium, or potassium nitrite are commonly used in this reaction.
The formation of β-nitroalcohols is another important reaction involving secondary nitroalkanes. In the presence of basic catalysts, secondary nitroalkanes react with aldehydes or ketones to produce β-nitroalcohols. This reaction is similar to aldol condensation. The stronger -I effect of the nitro group compared to the carbonyl group influences the preferential formation of the mesomeric anion from the nitroalkane.
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Tertiary nitroalkanes
Nitroalkanes are organic compounds that contain one or more nitro functional groups (−NO2). Nitroalkanes serve as valuable nucleophiles in Michael reactions due to their inherent reactivity and the subsequent transformations possible with the nitro group. Nitroalkanes also add efficiently to alkenoate derivatives under base catalysis.
The α-carbon of nitroalkanes is somewhat acidic. The pKa values of nitromethane and 2-nitropropane are 17.2 and 16.9, respectively, in dimethyl sulfoxide (DMSO) solution, suggesting an aqueous pKa of around 11. In other words, these carbon acids can be deprotonated in aqueous solution. The conjugate base is called a nitronate, and it behaves similarly to an enolate.
Nitroalkane oxidase catalyzes the oxidation of nitroalkanes to the corresponding aldehyde and nitrite. Nitroalkane oxidase oxidizes aliphatic nitro compounds exclusively, while other enzymes, such as glucose oxidase, have different physiological substrates. The explosive decomposition of organo nitro compounds is a redox reaction, and the explosion process generates heat by forming stable products such as molecular nitrogen (N2), carbon dioxide, and water.
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Nitroalkanes as nucleophiles
Nitroalkanes have been used as nucleophiles in organic synthesis, specifically in the synthesis of non-canonical amino acids. They are a versatile class of nucleophilic substrates for C–C bond formation, which is catalysed by variants of the β-subunit of tryptophan synthase (TrpB). The enzymes accept a wide range of nitroalkanes, which can then form non-canonical amino acids. The nitro group can be used as a handle for further modification.
Nitroalkanes are valuable nucleophiles in Michael reactions due to their inherent reactivity and the potential for subsequent transformations with the nitro group. They are reactive enough that no special activation is required, and the catalytic principles for the addition to α,β-unsaturated aldehydes and ketones are similar to those with other nucleophiles.
In organic chemistry, nitro compounds are organic compounds that contain one or more nitro functional groups (–NO2). The nitro group is a common functional group that makes a compound explosive. It is also strongly electron-withdrawing, which means that C−H bonds alpha (adjacent) to the nitro group can be acidic. Nitro groups are rarely found in nature and are almost always produced by nitration reactions starting with nitric acid.
Nitroalkanes have been used as nucleophiles in organic synthesis dating back to the venerable Henry reaction. Even in the absence of a base, these compounds readily tautomerize to a structure that is nucleophilic at carbon. In principle, any nitroalkane with a proton at the α-carbon could react, making nitroalkanes a more versatile substrate class than other mild carbanions like malonates.
Nitroalkanes have been shown to react with chemically produced amino-acrylates to form a wide range of amino acids, although these reactions required strong bases or harsh conditions, suggesting that biocatalytic conditions might not support this reaction design.
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Nitroalkanes in organic chemistry
Nitroalkanes are organic compounds that contain one or more nitro functional groups (-NO2). They are alkane derivatives in which a nitro group replaces one or more hydrogen atoms. The nitro group is one of the most common functional groups that makes a compound explosive. It is also strongly electron-withdrawing, which can make C-H bonds adjacent to the nitro group acidic. Nitroalkanes are valuable nucleophiles in Michael reactions due to their inherent reactivity and the subsequent transformations possible with the nitro group. They are reactive enough that no special activation is necessary.
Nitroalkanes are used in the manufacturing of oils, fats, shellac, and cellulose derivatives as solvents. They are also employed as starting materials for organic synthesis reactions and are useful intermediates in the synthesis of amino compounds and diazonium salts, which are essential ingredients in the synthesis of practically all organic molecules. Nitroalkanes can be prepared from alkyl halides using metal nitrites as the nitro-group source.
Primary nitroalkanes undergo hydrolysis when heated with 85% sulphuric acid to form hydroxylamine sulphate and the corresponding carboxylic acid. Secondary nitroalkanes under these conditions give tars, and tertiary nitroalkanes do not react. Primary or secondary nitroalkanes in the presence of basic catalysts react with aldehydes or ketones to give β-nitroalcohols. These nitroalcohols can be catalytically reduced to give the corresponding aminoalcohols, which are used in the preparation of detergents and similar products.
Nitroalkane oxidase catalyses the oxidation of nitroalkanes to the corresponding aldehyde and nitrite. Nitroalkanes also react with organolead triacetates to provide access to a wide range of α-alkynyl, α-aryl, and α-vinyl nitroalkanes.
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Frequently asked questions
Nitroalkanes are alkane derivatives in which a nitro group replaces one or more hydrogen atoms. They are used in the manufacturing of oils, fats, shellac, and cellulose derivatives as solvents.
Nitro groups are functional groups with the formula −NO2.
β-nitro alcohols are formed when primary or secondary nitroalkanes react with aldehydes or ketones.
No, they are not the same thing. Nitroalkanes are a precursor in the reaction that forms β-nitro alcohols.
