Does BMA mean n-butyl methacrylate or isobutyl methacrylate?

In most commercial usage the bare abbreviation means the normal isomer, n-butyl methacrylate, CAS 97-88-1. The branched isomer, isobutyl methacrylate, is a different substance with its own identifiers and a different contribution to copolymer hardness, and the tertiary isomer is different again. Because all three are abbreviated loosely in day-to-day correspondence, an order written as BMA alone is ambiguous. Write the full chemical name and the CAS number on every enquiry, purchase order and goods-inwards record.

Why must the monomer not be blanketed with pure nitrogen?

Because the stabiliser used in commercial methacrylate monomers requires dissolved oxygen to function. It intercepts radicals by a mechanism that consumes oxygen, so a drum stripped of oxygen contains an inhibitor that is chemically present and functionally absent. The correct headspace is air, or air diluted with nitrogen to a specified oxygen content, never an inert blanket. This is one of the very few cases in a chemical store where displacing oxygen makes a material more dangerous rather than less, and it catches people whose instinct is trained on flammable solvents.

How should inhibitor content be read on a certificate?

As a starting condition rather than a permanent property. The certificate reports the inhibitor level at release; that level falls in storage as the stabiliser does its job, and it falls faster in warm conditions, in light and in the presence of contamination. A long-stored drum can meet its original certificate on every other line while having very little inhibitor left. Where storage has been long or uncertain, retest the inhibitor level before charging a reactor rather than relying on the release figure.

What is popcorn polymerisation and why does it matter here?

It is a self-propagating, expanding polymer growth that forms in dead legs, vapour spaces, valve bonnets and residues where inhibitor cannot reach. Once seeded it continues under conditions that would not start a normal polymerisation, and it grows mechanically enough to jam valves and distort equipment. The controls are housekeeping controls: no unswept dead legs, no long-standing residues, no lines left full between campaigns, and clean vessels before refilling. It is not a reason to avoid methacrylate monomers, but it is a reason to design the pipework as if the monomer were reactive, because it is.

How does the butyl ester change a copolymer compared with the methyl one?

The four-carbon ester side chain is flexible and bulky, so it loosens chain packing and lowers the temperature at which the polymer softens. Against the methyl ester it gives a softer, more flexible and more extensible polymer, better adhesion and easier film formation, at the cost of hardness and block resistance. Against the corresponding acrylate it gives a harder polymer with the weathering advantage of the methacrylate backbone. Formulators use it as the soft component of an all-methacrylate system, which keeps the durability while tuning flexibility.

Qu'est-ce que Thréonine ?

Thréonine est un composé chimique enregistré sous le numéro CAS 72-19-5. Formule brute: C4H9NO3. Masse molaire: 119.12 g/mol. IUPAC: (2S,3R)-2-amino-3-hydroxybutanoic acid.

Quel est le numéro CAS de Thréonine ?

Le numéro CAS de Thréonine est 72-19-5 — un identifiant unique du Chemical Abstracts Service (CAS).

Quelle est la formule brute de Thréonine ?

Formule brute: C4H9NO3. Masse molaire: 119.12 g/mol. logP (XLogP3): -2.9. PSA: 83.6 Å².

Où acheter Thréonine ?

Thréonine est disponible dans notre boutique. Voir le produit : https://epchems.online/products/l-threonine/

D'où proviennent les données chimiques de Thréonine ?

Les données chimiques de Thréonine proviennent de sources faisant autorité : PubChem (NIH), ChEMBL (EBI). PubChem CID: 6288. Conformes au règlement CLP (CE 1272/2008), disponibles sous licence CC-BY 4.0.

Thréonine

CAS 72-19-5 · C₄H₉NO₃ · MW 119.12 g/mol

À propos de Thréonine

Thréonine est un composé chimique enregistré sous le numéro CAS 72-19-5, de formule brute C₄H₉NO₃, et de masse molaire 119.12 g/mol.

La molécule contient 17 atomes reliés par 16 liaisons chimiques. Le nom systématique IUPAC complet de ce composé est (2S,3R)-2-amino-3-hydroxybutanoic acid. Le modèle 3D interactif ci-dessus permet de visualiser l'arrangement spatial des atomes — vous pouvez le faire pivoter à la souris, zoomer avec la molette et basculer entre les modes de visualisation squelette / Ball & Stick / Space Fill.

Du point de vue des propriétés physico-chimiques, le coefficient de partage logP = -2.9 (valeur négative, composé hydrophile), surface polaire PSA = 83.6 Å², 3 donneurs et 4 accepteurs de liaisons hydrogène. Ces paramètres sont essentiels pour évaluer la biodisponibilité et l'interaction avec les biomolécules.

Les données chimiques de ce composé proviennent de PubChem (NIH NLM NCBI), l'une des plus grandes bases de données chimiques au monde. Toutes les informations sont mises à jour automatiquement et enrichies de traductions des mentions de danger GHS conformes au règlement CLP (CE 1272/2008). Le widget ci-dessus peut être utilisé à des fins éducatives, de recherche et commerciales.

Propriétés physico-chimiques

Wzór sumaryczny	C₄H₉NO₃
Masa molowa	119.12 g/mol
IUPAC	(2S,3R)-2-amino-3-hydroxybutanoic acid
SMILES	`C[C@H]([C@@H](C(=O)O)N)O`
InChIKey	`AYFVYJQAPQTCCC-GBXIJSLDSA-N`
logP (XLogP3)	-2.9
PSA	83.6 Å²
HBD / HBA	3 / 4
PubChem CID	CID 6288 ↗

Littérature scientifique

Literatura naukowa

10 artykułów · 7 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (10 artykułów)

Wysokość słupka = liczba artykułów w roku. Hover dla szczegółów.

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Heat Capacities of L-Cysteine, L-Serine, L-Threonine, L-Lysine, and L-Methionine

Václav Pokorný, Vojtěch Štejfa, Jakub Havlín et al. (2023) · Molecules

Cytowania: 27Open AccessDOI ↗PDF ↗

Synthesis of (2R, 3S)- or (2S, 3R)-2-amino-3-trifluoromethyl-3-hydroxyalkanoic acid derivatives (threonine and allo-threonine analogs) from enantiopure 4,4,4-trifluoro-3-hydroxybutanoic acid

Andrea R. Sting, Dieter Seebach (1996) · Tetrahedron

Cytowania: 34$ PaywallDOI ↗

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Threonine-rich carboxyl-terminal extension drives aggregation of stalled polypeptides.

Chang WD, Yoon MJ, Yeo KH et al. (2024) · Molecular cell

Open AccessDOI ↗PubMed ↗PDF ↗

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Comprehensive analysis of peripheral blood free amino acids in MASLD: the impact of glycine-serine-threonine metabolism.

Mino M, Kakazu E, Sano A et al. (2024) · Amino acids

Open AccessDOI ↗PubMed ↗PDF ↗

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Glycosylation of serine/threonine-rich intrinsically disordered regions of membrane-associated proteins in streptococci.

Rahman MM, Zamakhaeva S, Rush JS et al. (2025) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

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Threonine phosphorylation of STAT1 safeguards gut epithelial integrity and restricts interferon-mediated cytotoxicity.

Metwally H, Elbrashy MM, Kayama H et al. (2025) · Proceedings of the National Academy of Sciences of the United States of America

Open AccessDOI ↗PubMed ↗PDF ↗

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Threonine fuels glioblastoma through YRDC-mediated codon-biased translational reprogramming.

Wu X, Yuan H, Wu Q et al. (2024) · Nature cancer

Open AccessDOI ↗PubMed ↗PDF ↗

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An atlas of substrate specificities for the human serine/threonine kinome.

Johnson JL, Yaron TM, Huntsman EM et al. (2023) · Nature

Open AccessDOI ↗PubMed ↗PDF ↗

A novel O-GlcNAcylation at threonine 71 of histone H4 is a component of heterochromatin.

Hayakawa K, Hirosawa M, Nara D et al. (2025) · Journal of biochemistry

$ PaywallDOI ↗PubMed ↗

ChemInform Abstract: Synthesis of (2R,3S)‐ or (2S,3R)‐2‐Amino‐3‐trifluoromethyl‐3‐ hydroxyalkanoic Acid Derivatives (Threonine and allo‐Threonine Analogues) from Enantiopure 4,4,4‐Trifluoro‐3‐hydroxybutanoic Acid.

A. R. STING, D. SEEBACH (1996) · ChemInform

$ PaywallDOI ↗

Dane z PubMed (NIH NLM), OpenAlex (CC0), Semantic Scholar (AI2). AI Summary wygenerowane przez Semantic Scholar TLDR. Artykuły z ikoną wymagają płatnego dostępu.

Synonymes

L-threonine · threonine · 72-19-5 · (2S,3R)-2-amino-3-hydroxybutanoic acid · Threonin · L-(-)-Threonine · (S)-Threonine · 2-amino-3-hydroxybutyric acid · Treonina · (2S,3R)-2-Amino-3-hydroxybutyric acid · Threoninum · L-Threonin · L-thr · (2S)-threonine · L-2-Amino-3-hydroxybutyric acid

Sources des données

📊 PubChem CID 6288 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acheter en boutique

L-Threonine →

Molécules apparentées

2-Ethylhexanoic Acid CAS 149-57-5 · C8H16O2 Trichloroethylene CAS 127-18-4 · C2Cl4 Citric acid monohydrate CAS 77-92-9 · C6H8O7 Propylene glycol monomethyl ether (PM) CAS 107-98-2 · C4H10O2 L-Valine CAS 72-18-4 · C5H11NO2 2-Butanone CAS 78-93-3 · C4H8O