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Impurities and reference standards

N-Methylphthalimide

Also known as Phthalimide, N-methyl-, 1H-Isoindole-1,3(2H)-dione, 2-methyl-, N-methyl phthalimide

CAS 550-44-7Formula C9H7NO2Molar mass 161.16 g/molEC 208-982-4
GHS signal word: Warning. Pictograms: Harmful or irritant 19 suppliers listed
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N-Methylphthalimide chemical structure, C9H7NO2, CAS 550-44-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
550-44-7
Formula
C9H7NO2
Molar mass
161.16 g/mol
Physical form
Powder
HS code
292519
Category
Impurities and reference standards
Illustrative photo, a shrink wrapped pallet of kraft paper sacks in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is N-Methylphthalimide?

Plain description, key identifiers and synonyms

N-Methylphthalimide is a chemical substance with the molecular formula C9H7NO2 and a molar mass of 161.16 g/mol. Its CAS registry number is 550-44-7. The IUPAC name is 2-methylisoindole-1,3-dione.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-methylisoindole-1,3-dione
CAS number
550-44-7 CAS number cross-checked
EC number
208-982-4
Molecular formula
C9H7NO2
UNII
647UP45J2U
MDL number
MFCD00023063
InChIKey
ZXLYYQUMYFHCLQ-UHFFFAOYSA-N
InChI
InChI=1S/C9H7NO2/c1-10-8(11)6-4-2-3-5-7(6)9(10)12/h2-5H,1H3
SMILES (canonical and isomeric)
CN1C(=O)C2=CC=CC=C2C1=O

Synonyms

  • Phthalimide, N-methyl-
  • 1H-Isoindole-1,3(2H)-dione, 2-methyl-
  • N-methyl phthalimide
  • 2-methyl-isoindole-1,3-dione
  • 5-21-10-00273 (Beilstein Handbook Reference)
  • 2-Methylisoindoline-1,3-dione
  • 2-methylisoindole-1,3-dione
  • 2-Methyl-1H-isoindole-1,3(2H)-dione
  • N-Methylphthalimide, 98%
  • 2-Methyl-1H-isoindole-1,3(2H)-dione #
  • Milnacipran Impurity 20
  • N-Nethylphthalimide
  • Rivaroxaban Impurity 8
  • 1H-Isoindole-1, 2-methyl-
  • 2-methylbenzo[c]azoline-1,3-dione
  • 2-methylbenzo[c]azolidine-1,3-dione
  • N-Methylphthalimide(Discontinued,See C4X-103320)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Powderexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
161.16 g/molcalc.
Exact mass
161.0477 Dacalc.
LogP (octanol/water)
0.91calc.
Topological polar surface area
37.38 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
12calc.
Rings
2calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.11calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1NC(=O)c2ccccc21

O=C1NC(=O)c2ccccc21

2 rings, 11 atoms, the Phthalimide ring system.

2,700 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

N-Methylphthalimide suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 19 suppliers
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Where suppliers are based

19 suppliers in 7 countries

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N-Methylphthalimide price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Industrial uses: Intermediate.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code N-Methylphthalimide is traded under.

HS 2925.19Indicative HS code

Imides and their derivatives, salts thereof, other

World exports in 2024
$295M
+11.7% vs 2023, imports $348M
2019 to 2024
Top exporters
  1. China29.7%
  2. Japan22.7%
  3. United Kingdom10.0%
Top importers
  1. United States12.7%
  2. Brazil12.6%
  3. China10.5%
Reported customs values in USD, not prices.Full trade data

The HS code shown for N-Methylphthalimide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about N-Methylphthalimide, based on the data on this page

What is N-Methylphthalimide?

N-Methylphthalimide is a chemical substance with the molecular formula C9H7NO2 and a molar mass of 161.16 g/mol. Its CAS registry number is 550-44-7. The IUPAC name is 2-methylisoindole-1,3-dione.

What is the CAS number of N-Methylphthalimide?

The CAS registry number of N-Methylphthalimide is 550-44-7.

What is the molecular formula and weight of N-Methylphthalimide?

The molecular formula of N-Methylphthalimide is C9H7NO2 and its molar mass is 161.16 g/mol.

What is N-Methylphthalimide used for?

Industrial uses: Intermediate.

Is N-Methylphthalimide hazardous?

N-Methylphthalimide carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of N-Methylphthalimide?

N-Methylphthalimide is usually classified under HS code 292519 (Imides and their derivatives, salts thereof, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy N-Methylphthalimide?

CompoundList lists 19 suppliers of N-Methylphthalimide in China, India, United States, Canada and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy N-Methylphthalimide in India?

4 suppliers in India list N-Methylphthalimide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of N-Methylphthalimide?

Suppliers quote N-Methylphthalimide on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle N-Methylphthalimide

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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