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A new boron-selective resin derived from guar gum
1Department of Chemistry, University of Jodhpur, Jodhpur, India.
Talanta
|July 1, 1977
Summary
A novel boron-selective resin was developed from guaran, a natural polysaccharide. This resin effectively concentrates and separates boron for analytical determination.
Area of Science:
- Polymer Chemistry
- Analytical Chemistry
- Materials Science
Background:
- Boron is an essential micronutrient but can be toxic at higher concentrations.
- Accurate determination of boron is crucial in various fields, including agriculture and environmental monitoring.
- Existing methods for boron separation and pre-concentration can be complex or inefficient.
Purpose of the Study:
- To develop a novel, cost-effective, and efficient boron-selective resin.
- To utilize a natural, plant-derived polysaccharide for resin preparation.
- To apply the developed resin for the concentration and separation of boron for analytical purposes.
Main Methods:
- Preparation of a boron-selective resin by cross-linking of guaran, a natural plant hydrocolloid.
- Utilizing the cis-hydroxyl groups within the guaran polymer for selective boron complexation.
- Application of the resin for boron concentration and separation in analytical procedures.
Main Results:
- Successful preparation of a boron-selective resin from guaran.
- Demonstration of effective boron concentration and separation via complexation with cis-hydroxyl groups.
- Validation of the resin's utility in the determination of boron.
Conclusions:
- The developed guaran-based resin offers a promising approach for selective boron separation.
- This method provides an efficient way to pre-concentrate boron for enhanced analytical detection.
- Natural hydrocolloids represent a viable source for creating functional materials in analytical chemistry.
Related Concept Videos
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.
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...
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...
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 stereochemistry.
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 stereochemistry.

