62725-49-9

Usage

InChI:InChI=1/C24H24O8Si4/c25-35(26)30-33(21-13-5-1-6-14-21,22-15-7-2-8-16-22)29-34(31-36(27,28)32-35,23-17-9-3-10-18-23)24-19-11-4-12-20-24/h1-20,25-28H

Upstream product

• 2996-92-1 phenyl trimethylsiloxane 
• 98-13-5 Phenyltrichlorosilane 
• 6425-92-9 all-cis-1,3,5,7-tetrahydroxy-1,3,5,7-tetraphenylcyclotetrasiloxane 
• 10581-02-9 phenyltri(n-butoxy)silane 

Downstream Products

• 80446-54-4 r-2,c-4,t-6,t-8-tetrahydroxy-2,4,6,8-tetraphenylcyclotetrasiloxane 
• 80446-55-5 r-2,t-4,c-6,t-8-tetrahydroxy-2,4,6,8-tetraphenylcyclotetrasiloxane 
• 3511-13-5 5,5,7,7,13,13,15,15-octamethyl-1,3,9,11-tetraphenyl<9.5.1.1^3,9>octasiloxane 
• 70145-17-4 2,4,6,8-tetraphenyl-2,4,6,8-tetrakis(trimethylsiloxy)cyclotetrasiloxane 
• 76802-21-6 2,4,6,8-tetraphenyl-4,6,8-tris(trimethylsiloxy)-2-cyclotetrasiloxanol 
• 70127-27-4 1,3,5,7,9,11,13,17-octaphenyl-5,7,13,15,tetrakis(trimethylsiloxy)tricyclo<9.5.1.1^3,9>octasiloxane 

Relevant academic research and scientific papers

The influence of hcl concentration on the rate of the hydrolysis–condensation reaction of phenyltrichlorosilane and the yield of (Tetrahydroxy)(tetraphenyl) cyclotetrasiloxanes, synthesis of all its geometrical isomers and thermal self-condensation of the

The rate of hydrolysis–condensation reaction of phenyltrichlorosilane in water-acetone solutions and the product yields were shown to significantly depend on the concentration of HCl (CHCl) in the solutions. The main product of the reaction was all-cis-(t

Synthesis of siloxane analogs of calixarenes

First siloxane analogs of calixarenes were synthesized based on the stereoregular cis-tetraphenylcyclotetrasiloxanetetrol. Different methods were used to study properties of new compounds in bulk, as well as their behavior at the water-air interface.

Synthetic application of silicates/silanolates and their hydrolyzed polysilanol siloxanes for polyhedral oligomeric silsesquioxanes (POSSs)

Several types of silicate and their hydrolyzed polysilanols were applied to the synthesis of polyhedral oligomeric silsesquioxanes (POSSs). Silicate cubic octasilicate [Si8O20]8? 5 was silylated with trimethylchlorosilane to yield the incompletely trimethylsilylated cubic octasilicate [Si8O20](SiMe3)7H 1b bearing one silanol in addition to the totally trimethylsilylated derivative [Si8O20](SiMe3)8 1a. Further silylation of the monosilanol 1b with dimethylchlorosilane and α,ω-hydridochlorooctamethyltetrasiloxane resulted in the formation of POSSs 1c,d, which have hydrosilyl groups as elongated siloxane side chain. Attempts to generate an amino-substituted POSS via chloromethyldimethylsilylation of silicate 5 followed by reaction with amine as well as lithium amide failed. Amino-substitution was accomplished via the use of amine as a catalyst for the capping reaction of incompletely condensed trisilanol 10b with γ-aminopropyltrimethoxysilane affording mono amino-functionalized POSSs 2b,c in moderate yields. Another group of silanolates 7-9 was hydrolyzed with AcOH or HCl to give the corresponding cyclic polysilanol siloxanes 11a-c, respectively. Amine-catalyzed condensation of several of these polysilanol siloxanes 11a-c resulted in the formation of POSSs in high yields depending on the structure of substrates.

Unexpected Selectivity in Cyclotetrasiloxane Formation by the Hydrolytic Condensation Reaction of Trichloro(phenyl)silane

The hydrolytic condensation reaction of PhSiCl3in aqueous solution forming cyclotetrasiloxane [C6H5SiO(OH)]4was studied in detail. The reaction, originally reported by J. F. Brown, was believed to provide only one cyclotetrasiloxane diastereomer, cis,cis,cis-isomer 1. However, our detailed study clearly showed not only the formation of 1 (55.5 % yield) but also the formation of two other diastereomers, the cis,cis,trans isomer (11.9 % yield) and the cis,trans,cis isomer (4.3 % yield), without the formation of the last conceivable trans,trans,trans isomer (A possible mechanism for the selective formation of the three diastereomers was proposed, in which it was assumed that the cyclotetrasiloxanes were formed by cyclization exclusively through the meso diastereomer of the linear tetrasiloxanes but not through the dl diastereomer. This selective cyclization was reasonably explained by considering the stable conformations of the linear tetrasiloxanes in a highly polar aqueous medium.

Cyclic tetrasiloxanetetraols: Formation, isolation, and characterization

Hydrolysis of trialkoxysilanes having various substituents gave cyclic tetrasiloxanetetraols with all-cis isomer as the major fraction in the presence of equimolar amounts of water and sodium hydroxide. All stereoisomers of phenyl derivative were produced

Composition, insulating film and process for producing the same

A composition comprising at least one of a compound represented by formula (I); a hydrolysate of the compound represented by formula (I); and a condensate of the compound represented by formula (I) and the hydrolysate of the compound represented by formula (I): wherein R1 represents a hydrogen atom or a substituent; R2 represents a hydrogen atom, an alkyl group, an aryl group, an acyl group, an arylcarbonyl group, a group having a quaternary ammonium atom or a metal atom; and m represents an integer of from 6 to 30.

Mechanism for the Formation of Poly(phenylsilsesquioxane)

Poly(phenylsilsesquioxane) with molecular weight of 1400 was synthesized by hydrolysis of phenyltrichlorosilane, followed by condensation of the resulting hydrolyzates in the presence of a catalytic amount of hydrochloric acid in methyl isobutyl ketone. T