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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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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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SN2 Reaction: Kinetics02:14

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Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
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SN2 Reaction: Mechanism02:27

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The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
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An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
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SN2 Reaction: Stereochemistry02:23

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
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Driver behavior analysis on rural 2-lane, 2-way highways using SHRP 2 NDS data.

Jianqing Wu1, Hao Xu1

  • 1a Department of Civil and Environmental Engineering , University of Nevada, Reno , Reno , Nevada.

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|January 29, 2019
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Summary

Driver behavior is the leading cause of crashes on rural 2-lane, 2-way (RTLTW) highways. Young drivers and specific road features like curves and intersections increase the risk of driver behavior fault.

Keywords:
2-way roadsDriver behaviornaturalistic driving study datanear crashrural 2-lane

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Area of Science:

  • Traffic Safety Research
  • Human Factors in Transportation
  • Roadway Engineering

Background:

  • Rural 2-lane, 2-way (RTLTW) highways represent a significant portion of the US road network.
  • Crashes on these roads are a major safety concern and impact traffic flow.
  • Existing research has not thoroughly analyzed driver behavior's role in RTLTW highway incidents.

Purpose of the Study:

  • To analyze the contribution of driver behavior fault to crashes and near-crashes on RTLTW roads.
  • To compare the impact of driver behavior against roadway geometry and environmental factors.
  • To identify specific factors influencing driver behavior fault.

Main Methods:

  • Utilized data from 467 crash/near-crash records and 160 normal driving events from the Strategic Highway Research Program 2 Naturalistic Driving Study (NDS) database.
  • Employed random forest analysis to rank the contribution of driver behavior versus other factors.
  • Used a probit model to examine influences on driver behavior fault, with model reliability assessed by three parameters.

Main Results:

  • Driver behavior fault was identified as the most significant factor in RTLTW highway crashes.
  • Key factors highly related to driver behavior fault include driver age, traffic density, road alignment, intersection presence, and hand position on the wheel.
  • Young drivers (16-19) exhibited a higher likelihood of behavior fault compared to other age groups.

Conclusions:

  • Driver behavior is the primary determinant of crashes on rural 2-lane, 2-way highways.
  • Specific conditions such as curves, intersections, and lack of hands on the wheel increase the probability of driver behavior fault.
  • Locations with curves near intersections are particularly high-risk areas for driver behavior fault.