Silsesquioxanes as models of silica supported catalyst I. [3‐(Diphenylphosphino)propyl]‐hepta[propyl]‐[octasilsesquioxane] and [3‐mercapto‐propyl]‐hepta[propyl]‐[octasilsesquioxane] as ligands for transition‐metal ions

Hendan, Benedikt J.; Marsmann, H.C.

doi:10.1002/(sici)1099-0739(199904)13:4<287::aid-aoc844>3.3.co;2-g

Cited by 8 publications

(33 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The organoalkoxysilanes of the type R n Si(OR′) 4-n with various R organic functional groups and OR′ alkoxy groups are well known as precursors for the preparation of silica-based organic-inorganic hybrids. Like gel permeation chromatography, DOSY NNR showed a plateau between 70 to 100 hours in the growth of the oligomers, a time at which, according to 29 Si NMR spectroscopy, the well-defined octakis(3-mercaptopropylsilsesquioxane) is the major species. [5] A number of studies were carried out on different organically modified alkoxysilanes in which the pre-hydrolysis step usually initiated the network formation.…”

Section: Introductionmentioning

confidence: 99%

“…[24,25] As we reported recently, NBB synthesis is achievable under strictly controlled conditions by exploiting in situ water production (ISWP) provided by the esterification reaction between a carboxylic acid and an alcohol. This starting precursor with its thiol function is interesting for different applications that range from the immobilization on the hybrid surface of biomolecules, such as enzymes or proteins [28] and transition metals, [29] to the development of biosensing [30] and peptide separation [31] devices. [26,27] In this paper we report on the structural development and growth mechanisms of NBBs prepared by the ISWP route from 3-mercaptopropyltrimethoxysilane (McPTMS).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

et al. 2016

View full text Add to dashboard Cite

Thiol-functionalized nanobuilding blocks (NBBs) were synthesized from 3-mercaptopropyltrimethoxysilane by using the in situ water production (ISWP) process in which the water needed to hydrolyze the precursor was provided by means of an esterification reaction. In the present study the reaction between 1-propanol and chloroacetic acid was used. Whereas the growth of the Si oligomers was followed at room temperature and 100°C using 1D 29 Si and 2D 1 H-29 Si heteronuclear single quantum correlation (HSQC) NMR spectroscopic experiments, the amount of water delivered along the process was followed by means of 1 H NMR spectroscopy. The results show a good correlation between the evolution of the degree [a]

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Confirmation of the POSS-M24 structure is provided by the 13 C NMR spectrum, which exhibits, exclusively, sharp signals for carbon belonging to the fully converted vinyl groups in the MPTMS addition to octavinyloctasilsesquioxane (Fig. 3).…”

Section: Hsmentioning

confidence: 64%

“…1 H, 13 C and 29 Si nuclear magnetic resonance NMR spectra were recorded with a Brucker AVANCE III DRX-500 MHz spectrometer using CDCl 3 or C 6 D 6 as solvents. Spectrometer operating frequencies were 500.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of New Polyfunctional Cage Oligosilsesquioxanes and Cyclic Siloxanes by Thiol-ene Addition

Rózga-Wijas

Chojnowski

2012

J Inorg Organomet Polym

View full text Add to dashboard Cite

A novel octakis-2{ [3-(trimethoxysilyl)propyl] thio}ethyl-octasilsesqioxane (POSS-M24) was synthesized by radical thiol-ene addition of 3-mercaptopropyltrimethoxysilane, (MPTMS) to octavinyloctasilsesquioxane, (POSS-V8) in the presence of 2,2 0 azobisisobutyronitryl under mild conditions (60°C, toluene solution). Nano-building POSS units bearing both types of groups, 2-[3-(trimethoxysilyl)propylthio]-ethyl and vinyl, pendant to the POSS-cage were obtained by partial addition of MPTMS to the vinyl functions. Finally the thiol-ene addition of MPTMS to 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane (V 3 ) and 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane (V 4 ) were explored. The structures of the thiol-ene addition products were confirmed by 29 Si NMR and mass Spectroscopy.

show abstract

Proximity Effect using a Nanocage Structure: Polyhedral Oligomeric Silsesquioxane‐Imidazolium Tetrachloro‐ palladate Salt as a Precatalyst for the Suzuki–Miyaura Reaction in Water

et al. 2016

View full text Add to dashboard Cite

A polyhedral oligomeric silsesquioxane‐imidazolium tetrachloropalladate salt (POSS‐Imi‐PdCl4) was prepared by the reaction of a polyhedral oligomeric silsesquioxane‐imidazolium chloride salt (POSS‐Imi‐Cl) with PdCl2 and used as a pre‐catalyst for the Suzuki–Miyaura reaction in water at 100 °C at a low loading (0.08–0.16 mol %). Biphenyl compounds were isolated in high to excellent yields. A comparison of the POSS‐based catalyst with the corresponding catalyst without the nanocage structure (i.e., 1‐butyl‐3‐methylimidazolium tetrachloropalladate) highlighted the role of the POSS structure to reach higher yields in the Suzuki–Miyaura reaction. This result is ascribed to a proximity effect of the imidazolium moieties linked to the nanocage structure. Fresh and used catalytic materials were characterised by using X‐ray photoelectron spectroscopy and TEM.

show abstract

Silsesquioxanes as models of silica supported catalyst I. [3‐(Diphenylphosphino)propyl]‐hepta[propyl]‐[octasilsesquioxane] and [3‐mercapto‐propyl]‐hepta[propyl]‐[octasilsesquioxane] as ligands for transition‐metal ions

Cited by 8 publications

References 13 publications

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

Mechanism and Kinetics of Oligosilsesquioxane Growth in the In Situ Water Production Sol–Gel Route: Dependence on Water Availability

Synthesis of New Polyfunctional Cage Oligosilsesquioxanes and Cyclic Siloxanes by Thiol-ene Addition

Proximity Effect using a Nanocage Structure: Polyhedral Oligomeric Silsesquioxane‐Imidazolium Tetrachloro‐ palladate Salt as a Precatalyst for the Suzuki–Miyaura Reaction in Water

Contact Info

Product

Resources

About