API Process Intermediates & Related Compounds

Benzo[d]isoxazole

Name: Benzo[d]isoxazole
Brand: Zemixal
SKU: ZX-039780

Available on request

Benzo[d]isoxazole (CAS 271-95-4) supplier Zemixal. Request a quote with price, lead time and documents. Catalogue no. ZX-039780.

Pack sizes

CAS number271-95-4

FormulaC₇H₅NO

Molar mass119.12 g/mol

Physical formSolid

HS code2933

InChIKeyKTZQTRPPVKQPFO-UHFFFAOYSA-N

IUPAC name1,2-benzoxazole

About Benzo[d]isoxazole

Zemixal supplies Benzo[d]isoxazole within its pharma Intermediates & Building Blocks portfolio. Key data: CAS 271-95-4, formula C7H5NO and molar mass 119.12 g/mol. It is handled as a solid.

Use cases we see most often

API route development
Impurity fate & purge studies
Analytical method development

Storage and safety notes

Hazard communication follows GHS (Warning: H315, H319 and H335). Our SDS lists exposure controls and first-aid measures.

Available as 10 mg, 25 mg, 50 mg and 100 mg. Larger or split packs can be arranged. Every shipment includes a batch certificate of analysis and a 16-section SDS. Add it to your quote list and our team replies with price, lead time and shipping options within one business day.

Reference standards for Ascorbic acid

See every impurity, metabolite and related compound we list for this API.

Ascorbic acid standards

Typical uses

API route development
Impurity fate & purge studies
Analytical method development

Applications

Pharmaceutical Manufacturing and QC Research Labs and Universities

Specifications and identifiers

Specifications of Benzo[d]isoxazole
Product name	Benzo[d]isoxazole
Catalogue number	ZX-039780
CAS number	271-95-4
IUPAC name	1,2-benzoxazole
Molecular formula	C₇H₅NO
Molar mass	119.12 g/mol
Exact mass	119.0371
Physical form	Solid
XLogP3	1.6
H-bond donors / acceptors	0 / 2
Topological polar surface area	26 Å²
HS code	2933
InChIKey	KTZQTRPPVKQPFO-UHFFFAOYSA-N
SMILES	C1=CC=C2C(=C1)C=NO2
PubChem CID	71073
Synonyms	1,2-Benzisoxazole, Benz(d)isoxazole, Indoxazene, 4,5-Benzisoxazole, 1-Oxa-2-aza-1H-indene, 1,2-benzoisoxazole, Isoindoxazine, 4,5-Benzisoazole, 1-Oxa-2-azaindene

Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.

Safety and GHS hazards

Irritant or harmful

Signal word Warning

H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary statements P261, P264, P264 + P265, P271, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, P501

Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.

Pack sizes

Pack sizes of Benzo[d]isoxazole
10 mg	Quoted on request
25 mg	Quoted on request
50 mg	Quoted on request
100 mg	Quoted on request

Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.

Questions about Benzo[d]isoxazole

Which CAS number identifies Benzo[d]isoxazole?

Benzo[d]isoxazole is registered under CAS 271-95-4. You may also see it listed as 1,2-Benzisoxazole, Benz(d)isoxazole, Indoxazene. Our catalogue number for this item is ZX-039780.

What are the formula and molar mass of Benzo[d]isoxazole?

For Benzo[d]isoxazole, its formula is C7H5NO and its molar mass is 119.12 g/mol. The systematic (IUPAC) name is 1,2-benzoxazole. InChIKey KTZQTRPPVKQPFO-UHFFFAOYSA-N lets you match it in any structure database.

How is Benzo[d]isoxazole used in pharmaceutical QC?

Benzo[d]isoxazole is a characterised reference material linked to Ascorbic acid. Laboratories use it to identify and quantify this impurity during method development and validation, stability work, batch release testing and regulatory submissions.

What grade and pack sizes are available for Benzo[d]isoxazole?

The grade and assay are confirmed on the quotation and the batch COA. Standard packs are 10 mg, 25 mg, 50 mg, 100 mg. Larger quantities and custom packing can be quoted on request.

Which documents come with Benzo[d]isoxazole?

Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.

Can Zemixal ship Benzo[d]isoxazole to my country?

Yes. Because Benzo[d]isoxazole is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.

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