1,1,1,3,3,5,7,7,7-Nonamethyl-5-octacosyltetrasiloxane(CAS: 67762-83-8)

1,1,1,3,3,5,7,7,7-Nonamethyl-5-octacosyltetrasiloxane is a high-molecular-weight organosiloxane with a crystalline form at room temperature. The molecular weight is approximately 1000 g/mol. It is poorly soluble in water but soluble in organic solvents. Chemically, it is less reactive than lower molecular weight organosiloxanes, showing low reactivity under normal conditions.

1,1,1,3,3,5,7,7,7-Nonamethyl-5-octacosyltetrasiloxane is synthesized through the reaction of octacosylsilane with a mixture of methyl siloxanes in the presence of a Lewis acid catalyst, such as zinc chloride. The process involves condensation reactions leading to the formation of the desired tetrasiloxane with high selectivity and good yields.

1,1,1,3,3,5,7,7,7-Nonamethyl-5-octacosyltetrasiloxane is utilized in industries such as pharmaceuticals, where it can be used as a stabilizer, and in polymers, for improving physical properties. It is also used in sensors and semiconductors as a component in certain formulations, primarily due to its chemical stability and high molecular weight.

When handling 1,1,1,3,3,5,7,7,7-Nonamethyl-5-octacosyltetrasiloxane, it is essential to wear appropriate personal protective equipment (PPE), including gloves, goggles, and a lab coat. Work should be carried out in a well-ventilated area or a fume hood. In case of a spill, immediately clean up using appropriate absorbent materials and follow safety guidelines for disposal. Always refer to the Safety Data Sheet (SDS) for detailed safety information.