3806-34-6

Basic information

• Product Name: O,O'-Dioctadecylpentaerythritol bis(phosphite)
• Synonyms: -2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane;3,9-Bis(octadecyloxy);Distearylpentaerythritol Diphosphite;Distearyl Pentaerythrityl Diphsophite;Weston 618;2,4,8,10-Tetraoxa-3,9-diphosphaspiro5.5undecane, 3,9-bis(octadecyloxy)-;CYCLICNEOPENTANETETRAYLBIS(OCTADECYLPHOSPHITE);Antioxidant 618
• CAS NO: 3806-34-6
• Molecular Formula: C₄₁H₈₂O₆P₂
• Molecular Weight: 733.04
• EINECS: 223-276-6
• Product Categories: Polymer Additives;Polymer Science;Stabilizers
• Mol File: 3806-34-6.mol
• Article Data: 2

Chemical Properties

• Melting Point: 44-47 °C(lit.)
• Boiling Point: 692.244 °C at 760 mmHg
• Flash Point: >230 °F
• Appearance: /
• Density: 1.05[at 20℃]
• Vapor Pressure: 3.19E-18mmHg at 25°C
• Storage Temp.: 2-8°C
• Water Solubility: 330ng/L at 25℃
• CAS DataBase Reference: O,O'-Dioctadecylpentaerythritol bis(phosphite)(CAS DataBase Reference)
• NIST Chemistry Reference: O,O'-Dioctadecylpentaerythritol bis(phosphite)(3806-34-6)
• EPA Substance Registry System: O,O'-Dioctadecylpentaerythritol bis(phosphite)(3806-34-6)

Safety Data

• WGK Germany: 3
• Hazardous Substances Data: 3806-34-6(Hazardous Substances Data)

Usage

Uses

Color stabilizer for polymers

General Description

3,9-Bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane is a diphosphaspiro compound which contains two phosphorus atoms and can be used as an antioxidant and as a reducing agent.

Flammability and Explosibility

Nonflammable

InChI:InChI=1/C41H82O6P2/c1-3-5-7-9-11-13-15-17-19-21-23-25-27-29-31-33-35-42-48-44-37-41(38-45-48)39-46-49(47-40-41)43-36-34-32-30-28-26-24-22-20-18-16-14-12-10-8-6-4-2/h3-40H2,1-2H3

Synthetic route

1-octadecanol (112-92-5) + Pentaerythritol (115-77-5) → dioctadecyl pentaerythritol diphosphite (3806-34-6)

Conditions	Yield
With lithium hydroxide; triethyl phosphite at 130 - 160℃; for 2h; Temperature; Reagent/catalyst; Time;	98.2%

1-octadecanol (112-92-5) + pentaerythritol diphosphite → dioctadecyl pentaerythritol diphosphite (3806-34-6)

Conditions	Yield
at 160℃; for 0.00694444h; Time; Temperature;

Upstream product

• 112-92-5 1-octadecanol 
• 115-77-5 Pentaerythritol 

Relevant articles and documents

Preparation method of high-performance phosphorus-containing antioxidant 618

The invention relates to a preparation method of high-performance phosphorus-containing antioxidant 618. The preparation method comprises the following steps: adding a proper amount of triethyl phosphite, pentaerythritol, octadecanol and a catalyst into a reactor, controlling the temperature to be 120-130 DEG C, and carrying out heat preservation reaction for 1 hour; and then adjusting the vacuumdegree to -0.04 MPa to -0.07 MPa, heating to 160 DEG C, carrying out heat preservation for 1 h, removing ethanol generated in the reaction process, and carrying out hot filtration to obtain a target product. The method has the advantages of high product purity, high yield, simple process treatment, no waste generation, environmental protection, energy saving, short production period and easy process control.