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Like aldehydes, ketones are named using IUPAC rules; in this case, by replacing “e” in the name of the longest hydrocarbon chain with “one.” In acyclic ketones, the ketonic carbon is given the lowest locant value. For instance, as shown below, a simple five-carbon ketone is named pentan-2-one, instead of pentan-4-one. IUPAC rules also allow the placing of the locant value before the parent name to give an alternate name, 2-pentanone.
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Organomagnesium halides, commonly known as Grignard reagents, convert nitriles to ketones and proceed through a nucleophilic acyl substitution. Nitriles react with a Grignard reagent, followed by an aqueous acid, to yield ketones. The reaction introduces a new carbon–carbon bond. The alkyl–magnesium bond in the Grignard reagent is highly polar, so the alkyl carbon develops a carbanionic character and acts as a nucleophile.
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The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.
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Nootkatone.

Robin-Hagen Leonhardt1, Ralf G Berger

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Advances in Biochemical Engineering/Biotechnology
|October 20, 2014
PubMed
Summary
This summary is machine-generated.

(+)-Nootkatone, a grapefruit-scented sesquiterpene ketone, can be produced biotechnologically. Recent advances express plant enzymes in microbes for high yields of "natural" nootkatone.

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Area of Science:

  • Biotechnology
  • Organic Chemistry
  • Enzymology

Background:

  • (+)-Nootkatone is a valuable sesquiterpene ketone known for its grapefruit aroma and bioactivities.
  • Interest in nootkatone drives research into efficient synthesis and production methods.
  • Previous efforts explored chemical synthesis and various microbial expression systems.

Purpose of the Study:

  • To review and highlight recent advancements in the biotechnological production of (+)-nootkatone.
  • To discuss the expression of plant-derived enzymes in microbial hosts for enhanced nootkatone yields.
  • To identify opportunities for future bioprocess improvements.

Main Methods:

  • Expression of cytochrome P450 enzymes from bacteria and fungi in microbial hosts like Saccharomyces cerevisiae.
  • Demonstration of lipoxygenase-catalyzed nootkatone generation using enzymes from Pleurotus species.
  • Expression of plant valencene synthases in microbial hosts, coupled with farnesyl diphosphate pathways and valencene oxidase for high-yield production.

Main Results:

  • Microbial expression of cytochrome P450s and lipoxygenases has been explored for nootkatone synthesis.
  • Plant valencene synthases expressed in microbial hosts, with optimized pathways, yield significant amounts of nootkatone.
  • This approach provides access to nootkatone considered "natural" under current food regulations.

Conclusions:

  • Biotechnological production of (+)-nootkatone has significantly advanced, particularly through the use of recombinant plant enzymes in microbial systems.
  • The development of "natural" nootkatone via microbial hosts offers a promising alternative to traditional synthesis.
  • Further biochemical engineering of these recombinant strains is crucial for optimizing bioprocesses and maximizing yields.