What chemical does DESMP CAS 31618-90-3 identify?

DESMP identifies diethyl (p-toluenesulfonyloxy)methylphosphonate, also written as diethyl (tosyloxy)methylphosphonate. It is not diethyl methylphosphonate. Because the abbreviation is not self-defining, purchase documents should carry the expanded name, CAS number, molecular structure and an agreed identity method.

Which controls should be specified when purchasing DESMP as an industrial intermediate?

Specify assay and method, appearance, water, residual solvents, related substances and any process-specific impurity limits. The inquiry should also state quantity, packing and downstream acceptance criteria. Review the offered batch against its actual COA, TDS and SDS before approving it for production.

DESMP CAS 31618-90-3

DESMP , CAS 31618-90-3 , is diethyl p-toluenesulfonyloxymethylphosphonate , also described as diethoxyphosphorylmethyl 4-methylbenzenesulfonate. Its molecular formula is C12H19O6PS and molecular weight is 322.32 g/mol. It is an organophosphonate synthesis reagent, not 3-thiocyanatopropylmethyldiethoxysilane and not a rubber silane coupling agent. Buyers should qualify identity, assay, water, residual tosylating materials and phosphonate-related impurities against the intended phosphonomethoxy reaction.

CAS: 31618-90-3
Synonyms: DESMP, Diethyl p-toluenesulfonyloxymethylphosphonate, Diethyl (tosyloxymethyl)phosphonate, Diethoxyphosphorylmethyl 4-methylbenzenesulfonate
Molecular Formula: C₁₂H₁₉O₆PS
Grade: Confirm DESMP identity by an appropriate chromatographic and spectroscopic method, assay, water, residual tosylating materials, phosphonate hydrolysis products, related esters and residual solvents against the current COA.
Package: State quantity and destination; confirm the current compatible sealed container, closure, secondary containment, net fill, storage conditions and transport requirements against the SDS before quotation.

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Product Description

1 Identity and physicochemical profile

2 Applications and grade selection

3 Storage and handling

4 Safety, documentation and procurement

Identity and physicochemical profile

Item	Technical guidance
Correct identity	Diethyl p-toluenesulfonyloxymethylphosphonate; diethyl (tosyloxymethyl)phosphonate
CAS number	31618-90-3
Formula / molecular weight	C₁₂H₁₉O₆PS / 322.32 g/mol
Functional character	Activated tosyloxymethyl phosphonate reagent used to introduce a protected phosphonomethoxy group
Key purchase controls	Identity, chromatographic assay, water, residual p-toluenesulfonyl materials, phosphonate hydrolysis products, related esters and residual solvents
Corrected use boundary	DESMP is not an organosilane, thiocyanate, rubber coupling agent or silica reinforcement additive

Applications and grade selection

DESMP is used in controlled organophosphonate and phosphonomethoxy synthesis, including research and manufacturing routes where its activated tosyloxymethyl group reacts with a suitable nucleophile. Conversion depends on substrate, base, solvent, water and impurity profile, so the actual lot should be qualified in the buyer’s protected-intermediate route.

Confirm the complete structure and distinguish DESMP from similarly abbreviated silanes or sulfur-containing additives.
Set limits for assay, water, residual tosyl chloride or tosylate species, hydrolysis products and route-critical phosphonate impurities.
Evaluate conversion, selectivity, residual reagent removal and downstream impurity carryover at small scale.

Storage and handling

Keep the material sealed and protected from moisture, excessive heat and incompatible reagents under the conditions stated in the current COA and SDS. Use dry sampling and promptly reseal the qualified container.

Safety, documentation and procurement

Handle as a reactive synthesis intermediate with suitable gloves, eye protection and ventilation according to the current SDS. Procurement should define the reaction, analytical methods, impurity limits, quantity, packaging, destination and documentation requirements.

FAQ - Technical & Supply Chain

Q:
What chemical does DESMP CAS 31618-90-3 identify?

A: DESMP identifies diethyl (p-toluenesulfonyloxy)methylphosphonate, also written as diethyl (tosyloxy)methylphosphonate. It is not diethyl methylphosphonate. Because the abbreviation is not self-defining, purchase documents should carry the expanded name, CAS number, molecular structure and an agreed identity method.
Q:
Which controls should be specified when purchasing DESMP as an industrial intermediate?

A: Specify assay and method, appearance, water, residual solvents, related substances and any process-specific impurity limits. The inquiry should also state quantity, packing and downstream acceptance criteria. Review the offered batch against its actual COA, TDS and SDS before approving it for production.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

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Storage & Shipping

Product-specific conditions are confirmed before order.

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