9,9-Bis(methoxymethyl)-9H-fluorene（Cas 182121-12-6 Internal Electron donor for Ziegler-Natta Catalyst)

♦Brief  introduction

9,9-Bis(methoxymethyl)-9H-fluorene represents a next-generation internal electron donor

with a unique combination of rigidity, electronic modulation, and process compatibility. It holds

strong potential to replace or complement traditional phthalates and silane-based donors in high-performance

polypropylene catalyst systems, especially where enhanced stereoselectivity and environmental profile

are key considerations.

♦ Application

Organic Electronics:

Used in the synthesis of conjugated polymers and small molecules for OLEDs, OPVs, and organic semiconductors.

Synthetic Intermediate:

The methoxymethyl groups serve as protecting groups and can be cleaved or substituted, making the compound

a versatile building block in organic synthesis.

Photoresists & Lithography:

Useful in the development of photoactive materials due to the fluorene core’s UV-absorbing properties and thermal

stability.

Ziegler–Natta Catalysts:

9,9-Bis(methoxymethyl)-9H-fluorene, due to its rigid fluorene core and flexible ether functionalities,

can efficiently coordinate to transition metal centers (typically TiCl₄ on MgCl₂ supports) and modulate

their electron density. This leads to enhanced stereocontrol and narrow molecular weight distributions in the

produced polymer.

Overview as catalyst:

9,9-Bis(methoxymethyl)-9H-fluorene is a specially functionalized fluorene derivative featuring two

methoxymethyl (–CH₂OCH₃) substituents at the 9-position. Its unique molecular structure offers both

steric protection and electron-donating capability, making it a promising internal electron donor (IED)

in Ziegler–Natta (ZN) catalyst systems for the polymerization of propylene.

Role in Ziegler–Natta Catalysts:

In traditional Ziegler–Natta systems, internal electron donors are crucial for:

• Controlling stereoselectivity (isotacticity) of the resulting polypropylene.

• Modifying the coordination environment of the titanium active sites.

• Improving catalyst activity, particle morphology, and polymer properties.

9,9-Bis(methoxymethyl)-9H-fluorene, due to its rigid fluorene core and flexible ether functionalities,

can efficiently coordinate to transition metal centers (typically TiCl₄ on MgCl₂ supports) and modulate their

electron density. This leads to enhanced stereocontrol and narrow molecular weight distributions in the

produced polymer.

Advantages as an Internal Electron Donor:

♦ Storage:

Store at room temperature, away from direct sunlight

♦ Inspection Method

Physical Appearance: Visual inspection

Purity Analysis: Gas chromatography (GC)

Acid Value: Potentiometric titration

Water Content: Moisture analyzers

Refractive Index: Refractometer

Density: Density meter

Performance comparison