Description

1,3-Benzenediol, 5-Ethynyl- (9Ci) is a specialized organic building block featuring a resorcinol core functionalized with an ethynyl group, offering unique reactivity for advanced synthesis. This compound is valued for its role as a key intermediate in the development of complex molecules, particularly in pharmaceutical and material science research. It is primarily sought by R&D chemists and process development scientists in the fine chemical, agrochemical, and advanced polymer industries for constructing novel molecular architectures.

Application

• Pharmaceutical Intermediate: Serves as a critical building block in the synthesis of active pharmaceutical ingredients (APIs), especially those requiring a functionalized phenolic scaffold.
• Agrochemical Research: Used in the development of new herbicides, fungicides, and plant growth regulators where its ethynyl group enables further derivatization.
• Material Science & Polymer Chemistry: Acts as a monomer or cross-linking agent in the production of specialty resins, adhesives, and high-performance polymers.
• Organic Synthesis & Chemical Research: A versatile reagent for click chemistry (e.g., Huisgen cycloaddition) and other coupling reactions due to the presence of the alkyne functionality.
• Ligand & Catalyst Development: Utilized in the preparation of novel ligands for metal catalysis and organocatalysts.
• Dye & Pigment Intermediate: Employed in the synthesis of advanced organic dyes and functional colorants.

Basic Information

Product Name	1,3-Benzenediol, 5-Ethynyl- (9Ci)
CAS No.	145078-84-8
Molecular Formula	C8H6O2
Molecular Weight	134.13 g/mol
Synonyms	5-Ethynylbenzene-1,3-diol; 5-Ethynylresorcinol; 3-Hydroxy-5-ethynylphenol; 1,3-Dihydroxy-5-ethynylbenzene; 5-Ethynyl-1,3-benzenediol; Resorcinol, 5-ethynyl-
EINECS	Contact for details

Quality Control

Our 1,3-Benzenediol, 5-Ethynyl- (9Ci) is produced under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via FT-IR and NMR, to ensure it meets the high standards required for research and development applications. Certificates of Analysis (COA) detailing all specifications are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials such as strong oxidizing agents. Due to its light-sensitive nature, prolonged exposure to light should be avoided.

Specification

Item	Specification
Appearance	White to off-white powder or crystalline solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

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