Title: Octamethylcyclotetrasiloxane CAS Registry Number: 556-67-2 Molecular Formula: C8H24O4Si4 Molecular Weight: 296.62 Percent Composition: C 32.39%, H 8.16%, O 21.58%, Si 37.87% Literature References: Isolated from the hydrolysis product of dimethyldichlorosilane: Patnode, Wilcock, J. Am. Chem. Soc. 68, 358 (1946). Properties: Oily liquid. mp 17.5°. bp 175°. bp20 74°. d 0.9558. nD20 1.3968. Melting point: mp 17.5° Boiling point: bp 175°; bp20 74° Index of refraction: nD20 1.3968 Density: d 0.9558 Use: Preparation of methyl silicon oils.

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