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Hydroboration-Oxidation of Alkenes

Hydroboration-Oxidation of Alkenes

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.

Regioselectivity and Stereochemistry of Hydroboration

Regioselectivity and Stereochemistry of Hydroboration

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...

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

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.

Preparation of Alcohols via Addition Reactions

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...

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...

Hydrolysis of Chlorobenzene to Phenol: Dow Process

Hydrolysis of Chlorobenzene to Phenol: Dow Process

Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...

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Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy

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Published on: October 23, 2018

Zinc Borate Hydrolysis.

David M Schubert¹

¹Department of Chemistry and Biochemistry, Metropolitan State University of Denver, Denver, CO 80217, USA.

Molecules (Basel, Switzerland)

|September 23, 2022

Summary

This summary is machine-generated.

Zinc borate (ZnB3O4(OH)3) is a versatile industrial material. Its hydrolysis at neutral pH yields zinc hydroxide and boric acid, impacting its applications in fire retardants and preservatives.

Keywords:

boric acid composite materials preservative solubility wulfingite zinc hydroxide zinc oxide

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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

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Area of Science:

Materials Science
Inorganic Chemistry

Background:

Zinc borate (ZnB3O4(OH)3), commercially known as 2ZnO·3B2O3·3.5H2O, is a key industrial compound.
It serves critical roles as a fire-retardant synergist, agricultural micronutrient source, and preservative for building materials, enhancing wood composite durability.
Understanding its hydrolysis chemistry is vital for optimizing its industrial applications.

Purpose of the Study:

To investigate the hydrolysis chemistry of zinc borate (ZnB3O4(OH)3) under neutral pH conditions.
To elucidate the solubility and reaction pathways relevant to its industrial uses.

Main Methods:

Analysis of zinc borate solubility.
Investigation of hydrolysis reactions at neutral pH.

Main Results:

Zinc borate exhibits incongruent solubility.
It reversibly hydrolyzes at neutral pH into insoluble zinc hydroxide (Zn(OH)2) and soluble boric acid (B(OH)3).
The material shows sparing solubility, with a room temperature solubility of 0.270 wt% (oxide equivalent), comprising 0.0267 wt% B2O3 and 0.003 wt% ZnO.

Conclusions:

The hydrolysis behavior of zinc borate at neutral pH is a critical factor in its performance.
This understanding is essential for its effective utilization in polymers, agriculture, and building materials.
Further research into zinc borate chemistry can lead to improved material properties and applications.