629-99-2

Basic information

• Product Name: N-PENTACOSANE
• Synonyms: PENTAEICOSANE;PENTACOSANE;N-PENTACOSANE;ALKANE C25;PENTACOSANE, STANDARD FOR GC;N-PENTACOSANE, 250MG, NEAT;n-Pentacosane,99%;n-Pentacosan
• CAS NO: 629-99-2
• Molecular Formula: C₂₅H₅₂
• Molecular Weight: 352.68
• EINECS: 211-123-6
• Product Categories: Analytical Chemistry;n-Paraffins (GC Standard);Standard Materials for GC;Acyclic;Alkanes;Organic Building Blocks;Chemical Class;Hydrocarbons;NeatsAlphabetic;Alpha Sort;P;PA - PEN;P-SAlphabetic;Volatiles/ Semivolatiles
• Mol File: 629-99-2.mol
• Article Data: 6

Chemical Properties

• Melting Point: 53-56 °C(lit.)
• Boiling Point: 169-170 °C0.05 mm Hg(lit.)
• Flash Point: >230 °F
• Appearance: /Wax
• Density: 0,778 g/cm3
• Vapor Pressure: 2.66E-06mmHg at 25°C
• Refractive Index: 1.4380
• Storage Temp.: room temp
• Solubility: soluble in Benzene,Toluene
• BRN: 1763638
• CAS DataBase Reference: N-PENTACOSANE(CAS DataBase Reference)
• NIST Chemistry Reference: N-PENTACOSANE(629-99-2)
• EPA Substance Registry System: N-PENTACOSANE(629-99-2)

Safety Data

• Safety Statements: 22-24/25
• WGK Germany: 3
• RTECS: 211-123-6
• Hazardous Substances Data: 629-99-2(Hazardous Substances Data)

Usage

Chemical Properties

white glistening fluffy flakes

Definition

ChEBI: An alkane consisting of an unbranched chain of 25 carbon atoms.

General Description

Constituent of many naturally occurring waxes. A colorless solid at ambient conditions.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

Saturated aliphatic hydrocarbons, such as N-PENTACOSANE, may be incompatible with strong oxidizing agents like nitric acid. Charring of the hydrocarbon may occur followed by ignition of unreacted hydrocarbon and other nearby combustibles. In other settings, aliphatic saturated hydrocarbons are mostly unreactive. They are not affected by aqueous solutions of acids, alkalis, most oxidizing agents, and most reducing agents. When heated sufficiently or when ignited in the presence of air, oxygen or strong oxidizing agents, they burn exothermically to produce carbon dioxide and water.

InChI:InChI=1/C25H52/c1-3-5-7-9-11-13-15-17-19-21-23-25-24-22-20-18-16-14-12-10-8-6-4-2/h3-25H2,1-2H3

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Relevant articles and documents

A General Approach to Intermolecular Olefin Hydroacylation through Light-Induced HAT Initiation: An Efficient Synthesis of Long-Chain Aliphatic Ketones and Functionalized Fatty Acids

Herein, an operationally simple, environmentally benign and effective method for intermolecular radical hydroacylation of unactivated substrates by employing photo-induced hydrogen atom transfer (HAT) initiation is described. The use of commercially available and inexpensive photoinitiators (Ph2CO and NHPI) makes the process attractive. The olefin hydroacylation protocol applies to a wide array of substrates bearing numerous functional groups and many complex structural units. The reaction proves to be scalable (up to 5 g). Different functionalized fatty acids, petrochemicals and naturally occurring alkanes can be synthesized with this protocol. A radical chain mechanism is implicated in the process.

DEGRADATION OF POLYCYCLIC AROMATIC HYDROCARBONS TO RENDER THEM AVAILABLE FOR BIODEGRADATION

A method for the degradation of polycyclic aromatic compounds is disclosed that involves dissolving ozone in a bipolar solvent comprising a non-polar solvent in which is of sufficiently non-polar character to solubilized the polycyclic aromatic compounds, and a polar-water-compatible solvent which is fully miscible with the non-polar solvent to form a single phase with the non-polar solvent. The bipolar solvent with dissolved ozone is contacted with the polycyclic aromatic compounds to solubilize the polycyclic aromatic compounds and react the dissolved polycyclic aromatic compounds with the ozone to degrade the dissolved polycyclic aromatic compounds to oxygenated intermediates. The bipolar solvent is then mixed with sufficient water to form separate non-polar and polar phases, the non-polar phase comprising the non-polar solvent and the polar phase comprising the non-polar solvent and the oxygenated intermediates. The polar phase is then diluted and incubated with bacteria to biodegrade the oxygenated intermediates.

Temperatures and enthalpies of solid-solid and melting transitions of the odd-numbered n-alkanes C21, C23, C25, C27, and C29

Very high purity samples of normal pentacosane and heptacosane are made by synthesis: the procedures for the C25 and C27 synthesis and the original conditions of their purification, particularly using the extraction by supercritical carbon dioxide, are described. Measurements of temperatures and enthalpies of the solid-solid transitions and of the melting transition were carried out by differential scanning calorimetry on the C25 and C27 synthetic samples and the odd-numbered homologous n-alkanes (from C21 to C29). The results show the importance of the effect of the impurities, particularly for the δ and γ crystal-crystal transition temperatures of C25 and C27. Several current data of the literature are also shown concerning the temperatures and the enthalpies of solid-solid and melting transitions of these five n-alkanes.