Substance profile
(2-methylpropyl)lithium
(2-methylpropyl)lithium is a chemical substance with the molecular formula C4H9Li.
01 · Identification
What (2-methylpropyl)lithium is
(2-methylpropyl)lithium is a chemical substance with the molecular formula C4H9Li. Its molecular formula is C4H9Li and its molecular weight is 64.1 g/mol.
Under the GHS it carries the signal word Danger.
02 · Identifiers
(2-methylpropyl)lithium identifiers and molecular data
(2-methylpropyl)lithium CAS number and EC number
(2-methylpropyl)lithium molecular formula and molecular weight
Other names for (2-methylpropyl)lithium
- isobutyllithium
03 · GHS classification
(2-methylpropyl)lithium hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
(2-methylpropyl)lithium pictograms and signal word
(2-methylpropyl)lithium hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Pyrophoric liquids or Pyrophoric solids | Category 1 | H250 | GHS02 |
| In contact with water emits flammable gases GHS chapter 2.12 | Category 1 | H260 | GHS02 |
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
| Specific target organ toxicity - single exposure GHS chapter 3.8 | Category 3 narcotic | H336 | GHS07 |
| Hazardous to the aquatic environment - acute GHS chapter 4.1 | Category 1 | H400 | GHS09 |
| Hazardous to the aquatic environment - chronic GHS chapter 4.1 | Category 1 | H410 | GHS09 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
(2-methylpropyl)lithium hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H250 | Catches fire spontaneously if exposed to air. |
| H260 | In contact with water releases flammable gases which may ignite spontaneously. |
| H336 | May cause drowsiness or dizziness. |
| H314 | Causes severe skin burns and eye damage. |
| H400 | Very toxic to aquatic life. |
| H410 | Very toxic to aquatic life with long lasting effects. |
(2-methylpropyl)lithium supplemental EU statements (EUH)
| Code | Statement |
|---|---|
| EUH014 | Reacts violently with water. |
This page lists only the codes assigned to (2-methylpropyl)lithium. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for (2-methylpropyl)lithium
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of (2-methylpropyl)lithiu… issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
(2-methylpropyl)lithium precautionary statements
CLP Annex VI assigns 8 precautionary statements to (2-methylpropyl)lithium. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Disposal
What has to happen to the contents and the empty container.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
(2-methylpropyl)lithium name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | (2-метилпропил)литий изобутиллитий |
| Spanish español | (2-Metilpropil)litio isobutil-litio |
| Czech čeština | (2-methylpropyl)lithium isobutyllithium |
| Danish dansk | (2-methylpropyl)lithium isobutyllithium |
| German Deutsch | (2-Methylpropyl)lithium Isobutyllithium |
| Estonian eesti | (2-metüülpropüül)liitium isobutüülliitium |
| Greek ελληνικά | (2-μεθυλοπροπυλο)λίθιο ισοβουτυλολίθιο |
| English English | (2-methylpropyl)lithium isobutyllithium |
| French français | (2-méthylpropyl)lithium isobutyllithium |
| Croatian hrvatski | (2-metilpropil)litij izobutillitij |
| Italian italiano | (2-metilpropil)litio isobutillitio |
| Latvian latviešu | (2-metilpropil)litijs izobutillitijs |
| Lithuanian lietuvių | (2-metilpropil)litis izobutillitis |
| Hungarian magyar | (2-metilpropil)lítium izobutil-lítium |
| Maltese Malti | (2-metilpropil)litju isobutillitju |
| Dutch Nederlands | (2-methylpropyl)lithium isobutyllithium |
| Polish polski | (2-metylopropylo)lit isobutylolit |
| Portuguese português | (2-metilpropil)lítio isobutillítio |
| Romanian română | (2-metilpropil)litiu izobutillitiu |
| Slovak slovenčina | 2-metylpropyllítium izobutyllítium |
| Slovenian slovenščina | (2-metilpropil)litij izobutillitij |
| Finnish suomi | (2-metyylipropyyli)litium isobutyylilitium |
| Swedish svenska | (2-metylpropyl)litium isobutyllitium |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
(2-methylpropyl)lithium GHS label elements
Everything CLP Annex VI fixes for (2-methylpropyl)lithium, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
(2-methylpropyl)lithium
- Catches fire spontaneously if exposed to air.
- In contact with water releases flammable gases which may ignite spontaneously.
- May cause drowsiness or dizziness.
- Causes severe skin burns and eye damage.
- Very toxic to aquatic life.
- Very toxic to aquatic life with long lasting effects.
- Reacts violently with water.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Avoid release to the environment.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- Immediately call a POISON CENTER/doctor/…
- Do NOT induce vomiting.
- Collect spillage.
- Dispose of contents/container to …
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open (2-methylpropyl)lithium in the GHS label constructor →
07 · Transport
(2-methylpropyl)lithium UN number and transport classification
Transport classification is a separate system from the GHS classification above. It decides how a package is marked and how a load may be carried; it does not follow from the workplace label, and the workplace label does not follow from it. The entries below are linked by CAS number, never by name.
(2-methylpropyl)lithium under UN 1415 — shipping name, class and packing group
Europe · ADR 2025, Table A
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels (column 5) |
|---|---|---|---|---|
| LITHIUM | 4.3 | W2 | I | |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 4.3 is “Substances which, in contact with water, emit flammable gases” (ADR 2.1.1.1).
United States · 49 CFR 172.101 Hazardous Materials Table
| Proper shipping name (column 2) | Class or division | PG | Labels (column 6) |
|---|---|---|---|
| Lithium | 4.3 | I | |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 4.3 is “Dangerous when wet material” (49 CFR 173.2).
08 · Questions
(2-methylpropyl)lithium — frequently asked questions
What is the CAS number of (2-methylpropyl)lithium?
The CAS number of (2-methylpropyl)lithium is 920-36-5. Its EC number is 440-620-2.
What is the chemical formula of (2-methylpropyl)lithium?
The molecular formula of (2-methylpropyl)lithium is C4H9Li and its molecular weight is 64.1 g/mol.
What does a (2-methylpropyl)lithium label have to show?
Under CLP Annex VI the label for (2-methylpropyl)lithium carries the pictograms Flame, Corrosion, Exclamation mark and Environment and the signal word is Danger.
Is (2-methylpropyl)lithium flammable?
Yes. CLP Annex VI assigns (2-methylpropyl)lithium H250 and H260 — catches fire spontaneously if exposed to air.
Is (2-methylpropyl)lithium a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for (2-methylpropyl)lithium. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
Nearby
Substances next to (2-methylpropyl)lithium
Keep going: substances starting with 0–9, or search the whole database by name, CAS number, pictogram or signal word.