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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 carbonyl center is...
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
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Related Experiment Video

Updated: Apr 30, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Redetermination of β-Ba(PO3)2.

Matthias Weil1

  • 1Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria.

Acta Crystallographica. Section E, Structure Reports Online
|April 26, 2014
PubMed
Summary

This study redetermined the barium catena-polyphosphate structure using advanced CCD data, revealing precise atomic details and bond lengths. The findings offer a more accurate understanding of this inorganic material

Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Previous structural determination of β-barium catena-polyphosphate relied on Weissenberg film data.
  • Limitations in older methods hindered precise atomic parameter determination.

Purpose of the Study:

  • To redetermine the crystal structure of β-barium catena-polyphosphate with higher accuracy.
  • To utilize modern CCD data for a more detailed structural analysis.
  • To establish the absolute structure and refine atomic displacement parameters.

Main Methods:

  • Crystal structure redetermination using Charge-Coupled Device (CCD) data.
  • Analysis of anisotropic displacement parameters and atomic coordinate uncertainties.
  • Determination of the absolute crystal structure.

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Main Results:

  • All atoms were resolved with anisotropic displacement parameters.
  • Accurate bond-length distribution within the polyphosphate chain was determined (two shorter, two longer P-O distances).
  • The structure features polyphosphate chains parallel to [100] and Ba(2+) cations coordinated by ten oxygen atoms.

Conclusions:

  • The CCD-data-based redetermination provides significantly higher accuracy than previous methods.
  • The refined structural parameters offer a more precise understanding of barium catena-polyphosphate.
  • This work establishes a more accurate foundation for further studies on related inorganic materials.