874748-98-8

Upstream product

• 307531-92-6 1,3,5,7,9,11,14-heptaisobutyltricyclo[7.3.3.15,11]heptasiloxane-endo-3,7,14-triol 
• 13688-90-9 trichloro[4-(chloromethyl)phenyl]silane 

Downstream Products

• 1228039-21-1 C₃₅H₆₉N₃O₁₂Si₈ 

Relevant academic research and scientific papers

Spherical Supramolecular Structures Constructed via Chemically Symmetric Perylene Bisimides: Beyond Columnar Assembly

Like other discotic molecules, self-assembled supramolecular structures of perylene bisimides (PBIs) are commonly limited to columnar or lamellar structures due to their distinct π-conjugated scaffolds and unique rectangular shape of perylene cores. The discovery of PBIs with supramolecular structures beyond layers and columns may expand the scope of PBI-based materials. A series of unconventional spherical packing phases in PBIs, including A15 phase, σ phase, dodecagonal quasicrystalline (DQC) phase, and body-centered cubic (BCC) phase, is reported. A strategy involving functionalization of perylene core with several polyhedral oligomeric silsesquioxane (POSS) cages achieved spherical assemblies of PBIs, instead of columnar assemblies, due to the significantly increased steric hindrance at the periphery. This strategy may also be employed for the discovery of unconventional spherical assemblies in other related discotic molecules by the introduction of similar bulky functional groups at their periphery. An unusual inverse phase transition sequence from a BCC phase to a σ phase was observed by increasing annealing temperature.

A quaternary ammonium salt, obtained from the oxidation catalyst, and a method of manufacturing the catalyst using epoxy deriv.

PROBLEM TO BE SOLVED: To provide a technique for efficiently producing an epoxy derivative having a liquid crystalline skeleton, in which a non-halogen solvent can be used as a reaction solvent and an oxidation catalyst can be recovered from a reaction product.SOLUTION: A specific quaternary ammonium salt obtained by introducing a tertiary amine into silsesquioxane of T8 through an organic group is prepared, an oxidation catalyst is prepared from this quaternary ammonium salt, tungstic acids and phosphoric acids or a specific heteropolyacid such as tungstophosphoric acid, and hydrogen peroxide, and using this oxidation catalyst, a specific epoxy derivative is produced from a specific olefin derivative having a carbon-carbon unsaturated double bond at one end or both ends in the presence of hydrogen peroxide, wherein the epoxy derivative is obtained by oxidizing the carbon-carbon unsaturated double bond of the olefin derivative to an epoxy group. This oxidation catalyst is recovered from the reaction product by precipitation with a poor solvent after the epoxidation reaction.

Self-assembly and secondary structures of linear polypeptides tethered to polyhedral oligomeric silsesquioxane nanoparticles through click chemistry

In this study, we used click chemistry to synthesize a new macromolecular self-assembling building blocks, linear polypeptide-b-polyhedral oligomeric silsesquioxane (POSS) copolymers, from a mono-azido-functionalized POSS (N 3-POSS) and several alkyne-poly(γ-benzyl-L-glutamate) (alkyne-PBLG) systems. The incorporation of the POSS unit at the chain end of the PBLG moiety allowed intramolecular hydrogen bonding to occur between the POSS and PBLG units, thereby enhancing the α-helical conformation in the solid state, as determined through Fourier transform infrared spectroscopy and wide-angle X-ray diffraction analyses. POSS-b-PBLG underwent hierarchical self-assembly, characterized using small-angle X-ray scattering, to form a bilayer-like nanostructure featuring α-helical or β-sheet conformations and POSS aggregates. Thermogravimetric analysis indicated that the thermal degradation temperature increased significantly after incorporation of the POSS moiety, which presumably formed an inorganic protection layer on the nanocomposite's surface.