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Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...

Pharmaceutical Poisoning: Treatment Strategies

Pharmaceutical Poisoning: Treatment Strategies

Treatment strategies for poisoning are a critical aspect of emergency medicine, focusing on preventing the absorption of toxins and enhancing their elimination. When a poisoning incident occurs, the first response is to halt exposure and decontaminate the patient, particularly through gastrointestinal (GI) methods if the poison was ingested.Gastrointestinal Decontamination Techniques:Activated charcoal is the cornerstone of GI decontamination. It works through adsorption, binding the toxin to...

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction mixture.

Hypoxia

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...

Anticholinesterase Agents: Poisoning and Treatment

Anticholinesterase Agents: Poisoning and Treatment

Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.
Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is slower than the...

Determining the pH of Salt Solutions

Determining the pH of Salt Solutions

The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...

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Related Experiment Video

Updated: May 16, 2026

Intra-cardiac Side-Firing Light Catheter for Monitoring Cellular Metabolism using Transmural Absorbance Spectroscopy of Perfused Mammalian Hearts

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Hydroxocobalamin in cyanide poisoning.

John P Thompson¹, Timothy C Marrs

¹Wales College of Medicine, Cardiff University, University Hospital of Wales, Heath Park, Cardiff, UK.

Clinical Toxicology (Philadelphia, Pa.)

|November 21, 2012

Summary

Hydroxocobalamin shows promise as a cyanide poisoning antidote, particularly for cyanide salts. While generally safe, potential adverse effects like rashes warrant consideration in clinical use.

Area of Science:

Toxicology
Pharmacology

Background:

Hydroxocobalamin, a cobalt compound, is theoretically attractive for cyanide poisoning due to cyanide-binding properties.
This review examines hydroxocobalamin's pharmacokinetics, pharmacodynamics, efficacy, and adverse effects in human cyanide poisoning.

Purpose of the Study:

To review the pharmacokinetic and pharmacodynamic aspects of hydroxocobalamin.
To evaluate the efficacy of hydroxocobalamin in human cyanide poisoning.
To assess the adverse effects associated with hydroxocobalamin administration.

Main Methods:

A comprehensive literature search of PubMed from 1952 to April 2012 was conducted.
Seventy-one relevant papers were identified and included in the review.
Pharmacokinetic and pharmacodynamic data from animal and human studies were analyzed.

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Main Results:

Pharmacokinetic studies suggest a two-compartment model with first-order elimination.
Animal studies indicate hydroxocobalamin's potential as a cyanide antidote.
Limited human data suggest efficacy for cyanide salts, but evidence for smoke inhalation and hydrogen cyanide is less clear.

Conclusions:

Hydroxocobalamin appears to be an effective antidote for cyanide salt poisoning based on limited human data.
Efficacy in smoke inhalation and hydrogen cyanide poisoning requires further investigation.
While generally lacking clinically significant adverse effects, non-life-threatening reactions like delayed rashes can occur.