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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Ethyl (R)-(+)-2-(4-hydroxyphenoxy)propionate | CAS 71301-98-9

An R-configured phenoxypropionate ester with a free para-phenolic connection site, appearing in published aryloxyphenoxypropionate herbicide routes where enantiomeric composition and selective monoether identity require separate control.

CAS71301-98-9
Molecular formulaC11H14O4
Molecular weight210.23 g/mol

Product overview

One oxygen of the hydroquinone-derived ring carries an R-propionate ethyl ester chain, while the para oxygen remains a free phenolic hydroxyl. This combination of established configuration and an available ether-forming site defines its role in published herbicide synthesis. CAS 71301-98-9 specifies the R ethyl ester stage. Selection should address the R/S composition and the proportion of monoether bearing the free OH needed for the next connection. Doubly substituted hydroquinone derivatives consume that functionality and may therefore require separate limits. Chemical and chiral analyses should be paired with identification of the ethyl ester, including relevant free-acid or alternative-ester species associated with the chosen preparation.

Chemical identity

Chemical name
Ethyl (R)-(+)-2-(4-hydroxyphenoxy)propionate
CAS number
71301-98-9
Molecular formula
C11H14O4
Molecular weight
210.23 g/mol

Application context

Published fenoxaprop-P-ethyl and quizalofop-P-ethyl routes use the free para phenol to connect this R-configured fragment to a heteroaromatic partner. The ethyl phenoxypropionate unit is carried into the product. Qualification should preserve that free phenol and distinguish doubly substituted hydroquinone-related species, which lack the same available OH. Specify the ethyl ester, chiral R/S method and relevant monoether-related impurity controls for the intended coupling.

Chemistry and synthetic role

Two different oxygen functions have different jobs: the aryl ether anchors the chiral propionate, and the free phenol is the next connection point. Ester identity and R configuration are independent attributes; neither is established by a total purity result alone.

Quality review

Measure R/S composition

Agree a chiral method and acceptance criteria for the propionate stereocentre. A positive rotation label or ordinary HPLC assay is not a complete enantiomeric specification.

Retain the free phenol

Review monoether identity and any doubly substituted hydroquinone-related species indicated by the source route. The latter do not provide the same available OH connection.

Confirm the ethyl ester

Distinguish free acid and other ester forms, particularly if the supplier makes a family of phenoxypropionate intermediates. Agree a related-substances method that addresses relevant conversion products.

Preparing a specification

State the R ethyl ester with a free para phenol. Define chemical assay, chiral R/S criteria and hydroquinone-derived related-substances controls; specify water or free-acid limits if required by the receiving etherification.

Packaging and storage

Confirm packaging format, net weight and transport arrangements for the selected grade, order quantity and destination. Request the applicable SDS and label to establish storage and handling conditions.

Documentation

Request chiral and chemical chromatograms, identity spectra and the reporting basis for optical quality. Confirm availability of batch COA, SDS and method information for monoether and ester identity.

Procurement questions

Can the free acid replace this ethyl ester?

That changes the chemical stage and may require a different route; it should not be substituted without technical agreement.

Is total HPLC purity the R content?

Not unless the method resolves and quantifies the enantiomers.

Why check for double substitution?

Substitution of both phenolic oxygens removes the free OH needed for the intended next connection.

Technical sources
  1. Ethyl (R)-(+)-2-(4-hydroxyphenoxy)propionateSanta Cruz Biotechnology
  2. Ethyl (R)-(+)-2-(4-hydroxyphenoxy)propionate X5983AK Scientific
  3. Synthesis of fenoxaprop-P-ethylCN102351808A / Google Patents
  4. Preparation of quizalofop-P-ethylCN102584724B / Google Patents
  5. Synthesis of R-2-(4-hydroxyphenoxy)propionic acid ethyl esterCN112321428A / Google Patents