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|Section3= }} Octamethylcyclotetrasiloxane, also called D4, is an organosilicon compound with the formula ()4. lt is a colorless viscous liquid. It is a common cyclomethicone. Like other cyclomethicones, it is slightly volatile. It has attracted scrutiny because it is pervasive in the environment.〔Wang, De-Gao; Norwood, Warren; Alaee, Mehran; Byer, Jonathan D.; Brimble, Samantha "Review of Recent Advances in Research on the Toxicity, Detection, Occurrence and Fate of Cyclic Volatile Methyl Siloxanes in the Environment" Chemosphere 2013, volume 93, pages 711–725. 〕 ==Production== Commercially, D4 is produced by cracking polysiloxanes. The silicone polymer equilibrates in the presence of a strong base to give the tetramer :n/4 ()n → n ()4 The pentamer decamethylcyclopentasiloxane is also generated. These two cyclic species are separated from the polymer by distillation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Octamethylcyclotetrasiloxane」の詳細全文を読む スポンサード リンク
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