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Directing and Steric Effects in Disubstituted Benzene Derivatives01:18

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When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
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The Hinsberg test is a method to identify primary, secondary and tertiary amines, named after its pioneer, Oscar Hinsberg. Here, amines are treated with benzenesulfonyl chloride, also known as the Hinsberg reagent, in the presence of an excess of aqueous base, followed by acidification. Based on the nature of the amines, different changes are observed.
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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

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All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
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Exploring Substituted Dihydroxybenzenes as Urease Inhibitors through Structure-Activity Relationship Studies in Soil

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New urease inhibitors, dihydroxybenzenes (DHBs), show promise in reducing nitrogen loss from urea fertilizer. Certain DHBs outperformed the common inhibitor NBPT in Australian soils, offering a potential environmental solution.

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N‐(n‐butyl)thiophosphoric triamidedensity functional calculationsinhibition mechanisminhibitorssoil incubationurease

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Area of Science:

  • Agricultural Chemistry
  • Environmental Science
  • Biochemistry

Background:

  • Urea fertilization is vital for crop yield but causes nitrogen loss via ammonia volatilization, nitrate leaching, and nitrous oxide emissions.
  • Urease enzyme accelerates urea hydrolysis, leading to rapid ammonia formation and subsequent nitrogen losses.
  • Current urease inhibitors, like N-(n-butyl)thiophosphoric triamide (NBPT), have limitations in efficacy across different soil types.

Purpose of the Study:

  • To evaluate un- and substituted dihydroxybenzenes (DHBs) as potential alternatives to NBPT for inhibiting urease activity.
  • To compare the efficacy of DHBs and NBPT in delaying urea hydrolysis in two Australian soils.
  • To elucidate the inhibition mechanism of effective DHBs using kinetic and computational methods.

Main Methods:

  • Screening of DHB compounds for their ability to delay urea hydrolysis in soil.
  • Enzyme kinetic studies (Michaelis-Menten) to determine inhibition type (competitive vs. noncompetitive).
  • Density functional theory (DFT) calculations to model the interaction of inhibitors with the urease enzyme.

Main Results:

  • 4-fluorocatechol (DHB 6) and 4-bromocatechol (DHB 8) demonstrated superior performance over NBPT in delaying urea hydrolysis in an acidic sandy loam soil.
  • Kinetic analysis indicated NBPT acts as a competitive inhibitor, while DHB 8 functions as a noncompetitive inhibitor.
  • DFT calculations revealed DHB 8 binds to the urease active site's cysteine residue, hindering enzyme function by reducing flap flexibility.

Conclusions:

  • DHBs, particularly DHB 8, show significant potential as effective urease inhibitors in specific soil conditions.
  • These findings suggest DHBs could offer a more environmentally sustainable alternative to current urease inhibitors like NBPT.
  • Further research into DHBs could lead to improved nitrogen management strategies in agriculture, reducing environmental impact.