CAS 122640-83-9 is bis cyclohexyl-3,4,3 ‘, 4′ – tetracarboxylic dianhydride (HBPDA), a monomer of cycloaliphatic tetracarboxylic dianhydride with the molecular formula C ₁₆ H ₁₈ O ₆ and molecular weight of 306.31. It is mainly used for the synthesis of high-performance cycloaliphatic polyimides and functionalized imide intermediates.

Basic Information
-Chinese name: Bicyclohexyl-3,4,3 ‘, 4′ – tetracarboxylic dianhydride (also known as hydrogenated biphenylmethane dianhydride, hydrogenated biphenylmethane dianhydride HBPDA)
-English name: Dicyclohexyl-3,4,3′,4′-tetracarboxylic dianhydride / Dodecahydro-[5,5'-biisobenzofuran]-1,1′,3,3′-tetraone
-Molecular formula: C ₁₆ H ₁₈ O ₆; Molecular weight: 306.31 g/mol
-Appearance: White to nearly white powder or crystal
-Melting point: about 208 ° C; density:~1.37 g/cm ³
-Storage conditions: sealed, dry, inert gas protection (easily hygroscopic and hydrolyzed)

Structural features and reactivity
-Containing two saturated cyclohexane skeletons and two pairs of adjacent cyclic anhydride structures, it combines flexibility, lipophilicity, and high reactivity; The steric hindrance of anhydride sites is smaller than that of aromatic counterparts, and their electrophilicity is significant.
-Typical reaction: Upon contact with water, the ring opens to form the corresponding tetracarboxylic acid; Preparation of cycloaliphatic polyimides by condensation with aromatic/aliphatic diamines (improving transparency, solubility, and processability); Can be bisimidized with hydroxyl containing primary amines to retain side chain functional groups.

main purpose
-Polymer materials: synthesis of low dielectric, high transparency, and heat-resistant cycloaliphatic polyimide films/resins (in the fields of electronic packaging and optical films).
-Fine synthesis: used as a bifunctional imidization reagent to prepare functional molecules containing specific side groups.
-Positioning: It is a high-end synthetic material intermediate and not a bulk general chemical.

Safety and Compliance
-Customs code: 2917.20.0000 (acid anhydride); Moisture absorbing and requires moisture-proof operation; The specific GHS classification shall be based on the supplier SDS.
-The commercially available purity is commonly 97% -99%, and the price of reagent grade small packaging fluctuates greatly with specifications (such as 5g, ranging from tens to hundreds of yuan).

Products :

CAS 122640-83-9 HBPDA C16H18O6
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