Well-defined cyclic silanol derivatives

Abstract

Cyclic silanol derivatives (CSDs), possessing siloxane rings consisting of T-unit silicon and oxygen atoms, are considered efficient precursors for the preparation of versatile well-defined building blocks of hybrid materials such...

BINOL and triazole-containing Janus rings and 29-8-29-membered tricyclic ladder-type hybridized siloxane: application in the fluorescence sensing of anions

“…S13†) demonstrated the all- cis structure of 5 , with three single peaks attributed to the T-unit silicon atoms (Si in blue) at −78.79 ppm, silicon atoms of carbosilane (Si in green) at 4.86 ppm, and M-unit silicon atoms (Si in red) at 12.08 ppm, which is in accordance with those found in the previous reports. 25,33,34 In addition, the MALDI-TOF mass spectrum confirmed the structure of compound 5 with its ([M + Na] + , 2667.54, calcd 2667.88) peak.…”

“…Functionalization of all-cis cyclic silanols through hydroxyl groups, accessing well-defined all-cis-cyclic tetrasiloxanes (all-cis-T 4 , also named "Janus rings") bearing a variety of reactive functional groups, has been intensively reported over the last decade. 25 Functionalized all-cis-T 4 have potential in different application fields such as coating materials and photoactive and optical materials. [26][27][28] Very recently, two pyrene-substituted all-cis-T 4 have been proved to be selective sensors for the detection of gold ions and L-cysteine.…”

Sequential hydrothiolation–hydrosilylation: a route to the creation of new organosilicon compounds with preset structures

“…The synthetic approaches developed previously made it possible to obtain quite a few organosilicon compounds with diverse structures and properties. 4,5 The sequential application of Grignard and hydrosilylation reactions makes it possible to obtain carbosilane dendrimers. [6][7][8] The preparation of Rebrov's salts 9,10 from alkoxysilanes is a way for synthesizing silsesquioxane polymer brushes, 11 superbranched siloxanes, [12][13][14][15] and siloxane dendrimers.…”

Synthesis and characterization of sulfide/sulfone-containing 18-8-18-membered-ring ladder-type siloxanes

“…18 So far, a variety of functional groups have been successfully introduced into all-cis-T 4 by extending their upper and/or lower side chains via well-known organic transformations. 19 The hydrosilyl-substituted all-cis-T 4 are one of the most useful starting materials to access versatile Janus-type materials because they can be prepared with ease in large scales from accessible all-cis cyclic silanol/silanolate and chlorodimethylsilane. 18,[20][21][22] Moreover, the Si-H groups of these all-cis-T 4 can be easily modified by effective hydrosilylation and the resulting compounds have potential in the field of coating or photoactive materials.…”

“…It is worth noting that the high sensitivity of Si-O bond to base makes it not facile to control the precise structure and reactivity during the introduction of heteroatoms into siloxane framework. 19,34 The insertion of sulfide/sulfone into siloxane skeleton would provide the compounds conjunct properties of both organic sulfur and inorganic Si-O-Si components including high refractive index, high thermal stability, good processability, just to name a few. These innovative well-defined ladder-type compounds bearing a hybrid skeleton show high thermal stability and their crystal structures were determined by X-ray crystallographic analysis.…”