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Related Concept Videos

Preparation of Alcohols via Substitution Reactions01:38

Preparation of Alcohols via Substitution Reactions

Overview
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group. The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2, depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...
Preparation of Alcohols via Addition Reactions02:15

Preparation of Alcohols via Addition Reactions

Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Protection of Alcohols02:31

Protection of Alcohols

This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...
Conversion of Alcohols to Alkyl Halides02:48

Conversion of Alcohols to Alkyl Halides

This lesson delves into the conversion of alcohols to corresponding alkyl halides and the mechanism of action for different reagents. Typically, the hydroxyl group is first protonated to convert it to a stable leaving group. Consequently, based on the starting alcohol, the mechanism undergoes either of the nucleophilic substitution routes, SN1 or SN2. Tertiary alkyl halides are made using the two-step SN1 mechanism that occurs via a carbocation intermediate, which is stabilized by...
Production of Alcohol01:27

Production of Alcohol

Continuous fermentation is a key strategy in industrial ethanol production, particularly when efficiency, scalability, and high yields are essential. This approach allows for uninterrupted operation and optimized resource utilization. The primary feedstock, corn starch, undergoes enzymatic hydrolysis facilitated by α-amylase and glucoamylase. These enzymes break down the starch into fermentable sugars such as glucose, which are readily assimilated by fermentative microorganisms.Fermentation...

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Scheduling optimisation of alcohol test sites.

Hongjun Yu1, Emily Moylan1, Mike Bambach1

  • 1School of Civil Engineering, The University of Sydney, Sydney, Australia.

Scientific Reports
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Summary

Optimizing random breath tests (RBTs) with a genetic algorithm significantly enhances drink driving deterrence. This method improves positive results by 150% and overall tests by 59%, boosting road safety.

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Area of Science:

  • Road safety
  • Traffic engineering
  • Computational intelligence

Background:

  • Drink driving is a major cause of road crashes and fatalities.
  • Alcohol testing, specifically random breath tests (RBTs), serves as a key countermeasure to deter drink driving.
  • RBTs deter not only tested drivers but also observers who witness the tests.

Purpose of the Study:

  • To propose a genetic algorithm (GA)-based method for optimizing RBT schedules to maximize the deterrence of drink driving.
  • To develop a scheduling model that considers where, when, and for how long tests should occur.
  • To incorporate test outcomes and observer effects into the optimization's fitness function.

Main Methods:

  • A genetic algorithm (GA) was employed to optimize RBT scheduling.
  • Constraints were implemented to model limited testing resources, including total test duration, site duration, and number of sites.
  • Clustering of alcohol-related crash data was used to estimate drink driving patterns.
  • Traffic flow data from Victoria, Australia, was analyzed to model sober and drink driving behavior.

Main Results:

  • The proposed GA-based RBT scheduling optimization method demonstrated significant improvements.
  • A synthetic example showed a 150% increase in positive results and a 59% increase in overall tests conducted.
  • The method effectively balances deterrence with resource limitations.

Conclusions:

  • The GA-based RBT scheduling optimization is a highly effective strategy for enhancing drink driving deterrence.
  • This approach offers a substantial improvement over traditional methods in maximizing positive results and test efficiency.
  • Optimized RBT scheduling can lead to greater reductions in road crashes and fatalities attributed to drink driving.