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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...

β-Dicarbonyl Compounds via Crossed Claisen Condensations

β-Dicarbonyl Compounds via Crossed Claisen Condensations

Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds. The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.

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.

Alcohols from Carbonyl Compounds: Reduction

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...

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.

Cellulose and Pectic Polysaccharides

Cellulose and Pectic Polysaccharides

Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...

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Related Experiment Video

Updated: Jul 23, 2025

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

Published on: June 17, 2014

Modification of Cellulosic Materials with Boron-Nitrogen Compounds.

Irina Stepina¹, Aleksey Zhukov¹, Sofia Bazhenova¹

¹Department of Building Materials Science, National Research Moscow State University of Civil Engineering Yaroslavskoe sh. 26, 129337 Moscow, Russia.

|July 14, 2023

Summary

Boron-nitrogen compounds chemically modify wood fibers, enhancing fire and bio-resistance. This surface modification improves construction material durability without compromising strength.

Keywords:

analytical optimization bio-protection boron-nitrogen compounds cellulose fire-protection modification wood

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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

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Area of Science:

Materials Science
Organic Chemistry
Wood Science

Background:

Wood and cellulose-based materials require enhanced fire and bio-resistance for construction applications.
Chemical modification of hydroxylated substrates is key to improving material properties.
Boron-nitrogen compounds offer potential for effective material modification.

Purpose of the Study:

To investigate boron-nitrogen compounds for modifying cellulose and cellulose-containing materials.
To enhance the performance, bio-resistance, and fire-protection of construction materials.
To optimize the application and consumption of boron-nitrogen compounds.

Main Methods:

Chemical interaction analysis between boron-nitrogen compounds and cellulose.
Study of modification effects on amorphous and crystalline regions of cellulose.
Evaluation of changes in material strength and durability after modification.

Main Results:

Boron-nitrogen compounds chemically interact with hydroxyl groups at the C6-atom of cellulose.
The interaction is an inter-crystalline process, preserving cellulose crystal structure.
Surface modification enhances durability and strength of wooden structures, preventing accelerated aging.

Conclusions:

Boron-nitrogen compounds are effective modifiers for cellulose-based construction materials.
The chemical interaction mechanism ensures improved material properties without degradation.
This modification strategy offers a promising approach to increase the longevity and safety of wooden structures.