tert-Butylphosphonic acid
Tert-Butylphosphonic acid (CAS 4923-84-6) is an organophosphorus compound with the linear formula (CH3)3CP(O)(OH)2 and a molecular weight of 138.10 g/mol. This white to off-white crystalline solid serves as a valuable building block in organic synthesis. Its applications span the creation of diverse chemical intermediates and specialised phosphorus-containing molecules, making it a key reagent for researchers and industrial chemists.

Organic Synthesis Intermediate
Tert-Butylphosphonic acid is employed as a versatile intermediate in the synthesis of more complex organic molecules. It facilitates the introduction of the tert-butylphosphonyl group into various chemical structures.
Reagent in Phosphorus Chemistry
This compound is utilised in the development of novel phosphorus-containing compounds. It plays a role in research exploring new materials and functional molecules.
Building Block for Speciality Chemicals
It serves as a foundational building block for the production of speciality chemicals and phosphonates with specific industrial applications.
| Molecular weight | 138.10 |
|---|---|
| Linear formula | (CH3)3CP(O)(OH)2 |
| Assay | 98% |
| Melting point | 187-189 °C(lit.) |

Hazard statements
- H314Causes severe skin burns and eye damage
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 3261 8 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | C |
| Risk statements (R) | 34 |
| Safety statements (S) | 26-27-28-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is tert-Butylphosphonic acid used for?
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Tert-Butylphosphonic acid is primarily used as a building block in organic synthesis and as a reagent in phosphorus chemistry for creating speciality chemicals.
What is the CAS number and formula for tert-Butylphosphonic acid?
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The CAS number is 4923-84-6 and the linear formula is (CH3)3CP(O)(OH)2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies tert-Butylphosphonic acid with an assay of 98%. We do not represent this product as meeting USP, BP, or EP pharmacopoeia standards.
How should tert-Butylphosphonic acid be handled safely?
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Tert-Butylphosphonic acid causes severe skin burns and eye damage (H314). Handle with appropriate personal protective equipment, including eye protection, gloves, and respiratory protection (type P3 filter). Ensure adequate ventilation. Refer to the Safety Data Sheet for full details.
Is tert-Butylphosphonic acid a controlled substance?
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The provided data does not indicate that tert-Butylphosphonic acid is a controlled substance.
How is tert-Butylphosphonic acid packed and exported?
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Tert-Butylphosphonic acid is packed according to UN 3261, 8/PGII regulations for transport. As a global supplier, Tech Serve Solutions exports chemicals worldwide, adhering to all relevant shipping and customs regulations.
How can I request a sample or quote for tert-Butylphosphonic acid?
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To request a sample or obtain a quotation, please contact our sales department via the website or direct email, specifying the quantity required and your delivery location.
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