Synthesis and characterization of cage and bicyclic silsesquioxanes via dehydration of silanols

Autor:	Miwako Arai, Masafumi Unno, Ryoji Tanaka, Keisuke Takada, Shamsul Bahri Alias, Hideyuki Matsumoto
Rok vydání:	1999
Předmět:	Bicyclic molecule General Chemistry medicine.disease Silsesquioxane Inorganic Chemistry chemistry.chemical_compound Silanol chemistry Yield (chemistry) Siloxane Polymer chemistry medicine Dehydration Cage
Zdroj:	Scopus-Elsevier
ISSN:	1099-0739 0268-2605
DOI:	10.1002/(sici)1099-0739(199904)13:4<303::aid-aoc846>3.0.co;2-#
Popis:	Synthesis of cage and ladder silsesquioxanes by the dehydration of silanols using dicyclohexylcarbodiimide (DCC) is described. The reaction of 1,3-dicyclohexyldisiloxane-1,1,3,3-tetraol with DCC gave octa(cyclohexylsilsesquioxane) in 13% yield. The bicyclic ladder siloxane 3 (Ph8Thex2Si6O7) was prepared from 1,1,3,3-tetraphenyldisiloxane-1,3-diol and 1,3-dithexyldisiloxane-1,1,3,3-tetraol (Thex or thexyl denotes 1,1,2-trimethylpropy) at 80 °C. In this reaction, the propellane-type cage siloxane 2 (Ph6Thex2Si5O6) was generated also. Upon reaction completion at 120 °C, only 2 was obtained. The reaction from the same starting compounds with diisopropylcarbodiimide at 80 °C resulted in another caged siloxane, Ph4Thex4Si6O8 (5). The structures of 2, 3 and 5 were determined by X-ray crystallography. Copyright © 1999 John Wiley & Sons, Ltd.
Databáze:	OpenAIRE
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