Description

Boronic Acid, Cyclopentyl-, Diethyl Ester (9Ci) is a valuable organoboron compound, specifically a cyclopentylboronic ester, widely utilized as a key synthetic intermediate. Its primary value lies in enabling efficient carbon-carbon bond formation, particularly in Suzuki-Miyaura cross-coupling reactions, which are fundamental to modern pharmaceutical and agrochemical research. This chemical is essential for R&D chemists and process development scientists in the pharmaceutical, agrochemical, and advanced materials sectors who require high-purity building blocks for constructing complex molecular architectures.

Application

• Pharmaceutical Intermediate: A crucial building block in the synthesis of active pharmaceutical ingredients (APIs) and drug candidates via palladium-catalyzed cross-coupling reactions.
• Agrochemical Synthesis: Used in the research and development of novel herbicides, fungicides, and insecticides that require the incorporation of the cyclopentyl moiety.
• Material Science Research: Serves as a precursor for creating novel organic electronic materials, polymers, and liquid crystals.
• Chemical Biology & Medicinal Chemistry: Employed in the design and synthesis of chemical probes and tool compounds for target validation and biological pathway studies.
• Catalyst & Ligand Development: Acts as a starting material for synthesizing specialized ligands and catalysts used in asymmetric synthesis.
• Custom Synthesis & Contract Manufacturing: A key reagent for custom synthesis houses and CDMOs (Contract Development and Manufacturing Organizations) serving the life sciences industry.

Basic Information

Product Name	Boronic Acid, Cyclopentyl-, Diethyl Ester (9Ci)
CAS No.	86595-43-9
Molecular Formula	C9H19BO2
Molecular Weight	170.06 g/mol
Synonyms	Cyclopentylboronic Acid Diethyl Ester; Diethyl Cyclopentylboronate; Cyclopentylboronic Acid Diethyl Ester (9CI); Cyclopentyl Diethylboronate; (Diethoxyboranyl)cyclopentane; Cyclopentyl Diethoxyborane; Boronic acid, cyclopentyl-, diethyl ester
EINECS	Contact for details

Quality Control

Our Boronic Acid, Cyclopentyl-, Diethyl Ester (9Ci) is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including NMR (¹H, ¹³C, ¹¹B), GC or HPLC for purity assessment, and Karl Fischer titration for moisture content, to ensure it meets the high standards required for sensitive coupling reactions. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Due to its hygroscopic and highly volatile nature, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent moisture absorption and decomposition. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (NMR)	Conforms to structure
Purity (GC/HPLC)	≥ 97.0%
Water Content (KF)	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.