Description

5,5'-[9H-Fluoren-9-Ylidenebis(4,1-Phenyleneoxy)]Bis-1,3-Isobenzofurandione is a high-purity, specialized chemical intermediate with the CAS number 59507-08-3. This compound is valued for its unique molecular architecture, which makes it a critical building block in the synthesis of advanced polymers and functional materials. It is primarily sought by R&D and production teams in the advanced electronics, high-performance polymer, and specialty coatings industries for developing next-generation products.

Application

• Polyimide Monomer: A key precursor for synthesizing high-temperature, high-strength polyimide resins used in flexible printed circuits (FPC) and advanced semiconductor packaging.
• Advanced Polymer Synthesis: Serves as a core building block for engineering plastics with exceptional thermal stability, mechanical strength, and chemical resistance.
• Electronic Materials: Used in the development of dielectric layers, insulating films, and other critical components for microelectronics and optoelectronics.
• Specialty Coatings & Adhesives: Imparts superior durability and performance in high-end industrial coatings and high-temperature adhesives.
• Pharmaceutical Intermediate: Potential use as a sophisticated synthon in the research and development of complex active pharmaceutical ingredients (APIs).
• Liquid Crystal Polymers (LCPs): A functional monomer for creating LCPs with tailored properties for connectors, sensors, and other precision components.

Basic Information

Product Name	5,5'-[9H-Fluoren-9-Ylidenebis(4,1-Phenyleneoxy)]Bis-1,3-Isobenzofurandione
CAS No.	59507-08-3
Molecular Formula	C43H22O8
Molecular Weight	666.64 g/mol
Synonyms	9,9-Bis[4-(3,4-dicarboxyphenoxy)phenyl]fluorene dianhydride; BPFPA; 4,4'-(9-Fluorenylidene)diphenol bis(trimellitate) dianhydride; 4,4'-(9H-Fluoren-9-ylidene)diphenyl bis(trimellitate) dianhydride; 9,9-Bis[4-(3,4-dicarboxyphenoxy)phenyl]fluorene dianhydride; Fluorene-based dianhydride monomer; BPFDA; 4,4'-(9-Fluorenylidene)diphenol bis(trimellitic anhydride)
EINECS	Contact for details

Quality Control

Every batch of our 5,5'-[9H-Fluoren-9-Ylidenebis(4,1-Phenyleneoxy)]Bis-1,3-Isobenzofurandione is manufactured and tested under a strict quality management system. We ensure high purity and batch-to-batch consistency through advanced analytical techniques including HPLC, NMR, and FT-IR. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment 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 a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the container is sealed immediately after use to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to reference spectrum
Purity (HPLC)	≥ 98.5%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm

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