4-Bromobenzeneboronic Acid Neopentyl Glycol Ester: FAQs
4-Bromobenzeneboronic Acid Neopentyl Glycol Ester: FAQs
4-Bromobenzeneboronic acid neopentyl glycol cyclic ester is a stable, crystalline arylboronic ester widely used as a versatile building block and transmetalation partner in palladium-catalyzed Suzuki–Miyaura cross-coupling reactions and related organoboron transformations.
- Chemical Name
- 4-Bromobenzeneboronic acid neopentyl glycol cyclic ester
- SKU
- B710722
- Compound Class
- Cyclic arylboronic ester (neopentyl glycol boronate)
- Primary Application
- Suzuki–Miyaura cross-coupling; organoboron synthesis building block
- Key Functional Groups
- Aryl bromide and cyclic boronic ester
- Stability Advantage
- Neopentyl glycol esterification improves hydrolytic stability vs. free boronic acid
Overview and Chemical Identity
4-Bromobenzeneboronic acid neopentyl glycol cyclic ester (Aladdin SKU: B710722) is an organoboron compound in which the boronic acid moiety of 4-bromophenylboronic acid is protected as a cyclic ester with neopentyl glycol (2,2-dimethyl-1,3-propanediol). The resulting five-membered cyclic boronate offers improved air and moisture stability relative to the parent boronic acid, making it easier to handle, weigh, and store under standard laboratory conditions.
The molecule presents two orthogonal reactive sites: the aryl bromide, which can undergo oxidative addition to palladium(0) catalysts, and the cyclic boronate ester, which participates in transmetalation steps. This dual functionality makes the compound a valuable bifunctional building block in medicinal chemistry, materials science, and complex natural-product synthesis.
Handling, Storage, and Safety
As with most aryl bromide-containing organoboron reagents, standard precautions should be observed. The compound should be handled in a well-ventilated fume hood, and appropriate personal protective equipment (lab coat, gloves, and safety glasses) must be worn. Avoid inhalation of dust or aerosols.
For storage, keep the reagent in a tightly sealed container away from moisture and strong oxidizing agents. Cool, dry storage (typically 2–8 °C or room temperature under inert atmosphere depending on lot-specific recommendations) prolongs shelf life. Always consult the Safety Data Sheet (SDS) supplied by Aladdin Scientific before use, and follow institutional chemical hygiene plans.
Use in Suzuki–Miyaura Cross-Coupling Reactions
The Suzuki–Miyaura reaction is one of the most widely employed palladium-catalyzed C–C bond-forming reactions in organic synthesis. 4-Bromobenzeneboronic acid neopentyl glycol cyclic ester can function in this reaction in two complementary ways: (1) the aryl bromide moiety can serve as the electrophilic coupling partner, undergoing oxidative addition to Pd(0), after which an external boronate or boronic acid completes the catalytic cycle; or (2) under conditions that promote ester hydrolysis or direct transmetalation, the boronate ester itself acts as the nucleophilic partner.
Typical reaction conditions involve a Pd(0) or Pd(II) precatalyst (e.g., Pd(PPh₃)₄ or Pd(dppf)Cl₂), an inorganic base (e.g., K₂CO₃ or Cs₂CO₃), and a polar protic or mixed solvent system (e.g., DMF/water or THF/water) at elevated temperature. The neopentyl glycol ester is generally compatible with these standard conditions; however, researchers should verify hydrolysis kinetics under their specific reaction parameters, as the cyclic ester may hydrolyze more slowly than pinacol boronates under some mild conditions.
Ordering and Quality Information
4-Bromobenzeneboronic acid neopentyl glycol cyclic ester is available from Aladdin Scientific under SKU B710722. For current pricing, available pack sizes, purity specifications, and Certificate of Analysis (CoA), please visit the product page on the Aladdin Scientific website or contact your local Aladdin sales representative.
When placing an order, ensure you specify the correct SKU to avoid confusion with structurally related boronic acids or boronate esters. For bulk or custom quantity inquiries, reach out to Aladdin Scientific's procurement team. All products are subject to Aladdin's standard quality control procedures; lot-specific CoA documents are available upon request.
Frequently asked questions
What is 4-Bromobenzeneboronic acid neopentyl glycol cyclic ester used for?
This compound is primarily used as a bifunctional building block in palladium-catalyzed Suzuki–Miyaura cross-coupling reactions, where either the aryl bromide or the boronate ester functionality can participate depending on the reaction design. It is also used in medicinal chemistry and materials science as a versatile intermediate for constructing biaryl and complex aromatic frameworks.
How should I store 4-Bromobenzeneboronic acid neopentyl glycol cyclic ester to maintain its stability?
Store the compound in a tightly sealed container in a cool, dry place, away from moisture and oxidizing agents. Refrigerated storage (2–8 °C) under an inert atmosphere is generally recommended to maximize shelf life. Always refer to the lot-specific Safety Data Sheet and Certificate of Analysis from Aladdin Scientific for definitive storage instructions.
Is the neopentyl glycol boronate ester directly usable in Suzuki coupling without prior hydrolysis?
In many cases, yes. Cyclic boronate esters, including neopentyl glycol esters, can undergo in-situ hydrolysis under the aqueous basic conditions typically used in Suzuki–Miyaura reactions, releasing the active boronic acid species. However, the hydrolysis rate of the neopentyl glycol ester may differ from that of pinacol esters, so reaction optimization—including base strength, water content, and temperature—may be required to achieve optimal yields.
What palladium catalysts are compatible with this reagent?
Common palladium catalysts used with arylboronate esters include Pd(PPh₃)₄, Pd(dppf)Cl₂, Pd(OAc)₂ with phosphine ligands, and various Pd-NHC complexes. Catalyst choice should be guided by the specific coupling partner, solvent system, and substrate sensitivity. Researchers are encouraged to screen multiple catalysts to identify optimal conditions for their particular transformation.
How does the neopentyl glycol boronate ester compare to the pinacol boronate ester in terms of reactivity?
Both neopentyl glycol and pinacol boronate esters are cyclic protecting groups for boronic acids that enhance stability and handling. Pinacol esters are more widely reported in the literature, but neopentyl glycol esters can offer advantages in crystallinity and aqueous workup, as neopentyl glycol is more water-soluble than pinacol. Relative transmetalation rates may vary; specific comparative data for this compound should be verified against primary literature or empirical screening.
References
- Miyaura, N.; Suzuki, A. Palladium-Catalyzed Cross-Coupling Reactions of Organoboron Compounds. Chemical Reviews 1995, 95 (7), 2457–2483. doi:10.1021/cr00039a007
- Hall, D. G. (Ed.) Boronic Acids: Preparation and Applications in Organic Synthesis, Medicine and Materials, 2nd ed.; Wiley-VCH: Weinheim, 2011.
- Aladdin Scientific. Product Page: 4-Bromobenzeneboronic acid neopentyl glycol cyclic ester, SKU B710722. Aladdin Scientific Corp.
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