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π Molecular Orbitals of 1,3-Butadiene01:24

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Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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PAH Induction upon Pyrolysis of Hydroxyl-Terminated Polybutadiene-Based Solid Rocket Fuels.

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Ammonium perchlorate (AP) significantly alters hydroxyl-terminated polybutadiene (HTPB) pyrolysis, forming polycyclic aromatic hydrocarbons (PAHs) under rocket motor conditions. This contrasts with previous assumptions, revealing new insights into solid fuel combustion chemistry.

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Area of Science:

  • Combustion Chemistry
  • Polymer Pyrolysis
  • Solid Rocket Propellants

Background:

  • Previous studies assumed ammonium perchlorate (AP) minimally impacted hydroxyl-terminated polybutadiene (HTPB) pyrolysis.
  • The role of AP as a featureless oxidant, solely increasing pyrolysis temperatures, was the prevailing view.

Purpose of the Study:

  • To investigate the influence of AP on HTPB pyrolysis chemistry under simulated solid rocket motor conditions.
  • To identify novel pyrolysis products and elucidate formation pathways.
  • To challenge existing assumptions about AP's role in HTPB decomposition.

Main Methods:

  • Utilized a molecular beam (MB) approach coupled with time-of-flight mass spectrometry (TOFMS) for high-time-resolution analysis.
  • Employed pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS) for detailed product identification.
  • Confirmed findings with evolved gas analysis-mass spectrometry (EGA-MS).

Main Results:

  • Detected polycyclic aromatic hydrocarbons (PAHs) up to m/z 240-260 during HTPB/AP pyrolysis, absent in HTPB pyrolysis alone.
  • Observed the formation of cyclic C6 products (benzyne, benzene) at the expense of acyclic C6 products.
  • PAH formation was confirmed to occur on a microsecond timescale, yielding products with up to five rings.

Conclusions:

  • Ammonium perchlorate actively participates in and modifies HTPB pyrolysis chemistry, contrary to prior assumptions.
  • The formation of PAHs and cyclic C6 products is a significant, previously unrecognized aspect of HTPB/AP combustion.
  • This research necessitates a re-evaluation of solid rocket propellant combustion models to incorporate these findings.