The chemistry of titanium coupling agents

1981 ◽  
Vol 34 (3) ◽  
pp. 653 ◽  
Author(s):  
RSP Coutts
Keyword(s):  
Spectroscopic Properties ◽  
Wood Fibre ◽  
The Other ◽  
Coupling Agents ◽  
Synthesis And Characterization ◽  
Cement Composites ◽  
Titanium Alkoxides ◽  
Reinforced Cement

Modified titanium alkoxides, which have been shown to be effective as coupling agents in the preparation of wood-fibre reinforced cement composites, are described in this publication. The synthesis and characterization of two previously unknown alkoxides are reported together with some spectroscopic properties of the other compounds.

Coupling agents in wood fibre-reinforced cement composites

Composites ◽  
1979 ◽  
Vol 10 (4) ◽  
pp. 228-232 ◽  
Author(s):  
R.S.P. Coutts ◽  
M.D. Campbell
Keyword(s):  
Wood Fibre ◽  
Coupling Agents ◽  
Cement Composites ◽  
Reinforced Cement

Synthesis and Characterization of Chiral Conducting Polymers Based on Polypyrrole

1997 ◽  
Vol 50 (9) ◽  
pp. 939 ◽  
Author(s):  
Fang Chen ◽  
Parveen Akhtar ◽  
Leon A. P. Kane-Maguire ◽  
Gordon G. Wallace
Keyword(s):  
Conducting Polymers ◽  
Propionic Acid ◽  
Spectroscopic Properties ◽  
Optically Active ◽  
Synthesis And Characterization ◽  
Chiroptical Properties ◽  
Covalently Bonded ◽  
Circular Dichroïsm ◽  
Ring Position

A range of optically active pyrrole monomers have been synthesized in which a chiral sub- stituent is covalently bonded either to the pyrrole N or C3 ring position, namely (–)-(1R)-4-methyl-N-(1-phenylethyl)pyrrole-3-carboxamide, (+)-(1S)-4-methyl-N-(1-phenylethyl)pyrrole-3-carboxamide, (–)-(1R)-4-methyl-N-(1-naphthylethyl)pyrrole-3-carboxamide, (+)-(1S)-4-methyl-N-(1-naphthylethyl)pyrrole-3-carboxamide, (+)-(2S)-2-(1H-pyrrol-1-yl)propionic acid, (+)-(1S)-N-(1-phenyl-ethyl)pyrrole, and (–)-(1R)-N-(1-phenylethyl)pyrrole. Their chiroptical properties have been established by circular dichroism spectroscopy. Electropolymerization of the three N-substituted pyrrole monomers provided films of chiral conducting polymers, whose electrical and spectroscopic properties are described. Although oxidation of the C3 substituted pyrrole monomers was also facile, electrodeposition was poor and films of the associated polymers could not be obtained.

Synthesis and Characterization of Novel Gold(III) Complexes of Asymmetrically Aryl-Substituted 1,2-Dithiolene Ligands Featuring Potential-Controlled Spectroscopic Properties

2010 ◽  
pp. n/a-n/a ◽  
Author(s):  
Lucia Ambrosio ◽  
M. Carla Aragoni ◽  
Massimiliano Arca ◽  
Francesco A. Devillanova ◽  
Michael B. Hursthouse ◽  
...  
Keyword(s):  
Spectroscopic Properties ◽  
Synthesis And Characterization

Microstructure Synthesis and Characterization of Carbon Nanofibers Reinforced Cement-Based Composites

2019 ◽  
Vol 47 (6) ◽  
pp. 20180270 ◽  
Author(s):  
Baomin Wang ◽  
Baolin Guo ◽  
Yu Han ◽  
Yuan Zhang ◽  
Yang Li
Keyword(s):  
Carbon Nanofibers ◽  
Synthesis And Characterization ◽  
Reinforced Cement

scholarly journals Darstellung und Charakterisierung einfacher α-Sila- und α,ω-Disilaalkane als Vorstufen für die CVD-Erzeugung von amorphem Silicium a-SiC:H / Synthesis and Characterization of Simple α-Sila- and α,ω-Disilaalkanes: Precursors for the CVD Production of Amorphous Silicon a-SiC:H

1987 ◽  
Vol 42 (9) ◽  
pp. 1088-1096 ◽  
Author(s):  
Hubert Schmidbaur ◽  
Cornelia Dörzbach
Keyword(s):  
Amorphous Silicon ◽  
Spectroscopic Properties ◽  
High Yield ◽  
Synthesis And Characterization ◽  
Nmr Data ◽  
Functional Derivatives ◽  
New Compounds

Preparative methods have been explored for the synthesis of small, volatile polysilaalkanes, which could serve as starting materials for the production of amorphous silicon a-SiC:H. High yield pathways have been developed for H3SiCH2CH2SiH3 and H3SiCH2CH2CH2SiH3. These compounds can be converted into symmetrically halogen-functional derivatives through the reac­tions with SnCl4 or Br2. The homologous H3SiCH2CH2SiH2CH3 has also been prepared and halogenated, starting from the corresponding vinylsilane via the hydrosilylation route. Allylsilanes were the source of the synthesis of H3SiCH2CH=CH2, CH3SiH2CH2CH=CH, SiH2(CH2CH = CH2)2, SiH2(CH2CH2CH2SiH3)2, or HSi(CH2CH2CH2SiH3)3. Methylated deriva­tives are also available. - Some physical and spectroscopic properties of the new compounds have been investigated. In particular. NMR data were collected and used for an assessment of structure and isomerism.

Synthesis and Characterization of Highly Conjugated Unsymmetrically Substituted Phthalocyanines

1997 ◽  
Vol 01 (03) ◽  
pp. 221-226 ◽  
Author(s):  
GEMA DE LA TORRE ◽  
TOMÁS TORRES
Keyword(s):  
Spectroscopic Properties ◽  
Second Order ◽  
Synthesis And Characterization ◽  
Optical Responses ◽  
Delocalized Electron ◽  
Non Linear ◽  
Linear Optical ◽  
High Degree

Unsymmetric push-pull phthalocyanines with a high degree of conjugation achieved by introducing π-delocalized electron substituents were synthesized by statistical condensation of two different diiminoisoindolines. The characterization and spectroscopic properties of these push-pull phthalocyanines are described. These compounds are targeted for the study of their second-order non-linear optical responses.

scholarly journals Synthesis and characterization of enantiopure planar–chiral phosphorus-linked diferrocenes

2021 ◽  
Vol 77 (3) ◽  
pp. 152-160
Author(s):  
Philipp Honegger ◽  
Alexander Roller ◽  
Michael Widhalm
Keyword(s):  
Crystal Structures ◽  
The Other ◽  
Synthesis And Characterization ◽  
Chiral Compound ◽  
One Step ◽  
Subsequent Cyclization ◽  
P Type ◽  
Phosphine Sulfide

In the course of an ongoing synthetic project on cyclic diferrocenylphosphines, we obtained a group of planar–chiral diferrocenyl compounds useful as precursors for subsequent cyclization. Here we report the crystal structures of two symmetric compounds [(FcA)2(Ph)P], one of which contains four stereogenic centres (two C chiral and two planar chiral centres), i.e. 1,1′-(phenylphosphanediyl)bis{(2S p)-2-[(1R)-1-(acetyloxy)ethyl]ferrocene}, [Fe2(C5H5)2(C24H25O4P)], and the other phosphine sulfide is a purely planar–chiral compound (two planar chiral centres), i.e. bis[(2S p)--2-ethenylferrocen-1-yl]phenylphosphane sulfide, [Fe2(C5H5)2(C20H17PS)]. Owing to the stereocentres present, reactions performed on [(FcA)2(Ph)P]-type compounds strongly favour one ferrocene unit over the other due to diastereoselectivity. Furthermore, we present four related structures where the ferrocene units are not identical [(FcA)(FcB)(Ph)P]. These are {(2S p)-2-[(1R)-1-(acetyloxy)ethyl]ferrocen-1-yl}[(2S p)-2-ethenylferrocen-1-yl]phenyl-(S)-phosphine sulfide, [Fe2(C5H5)2(C22H21O2PS)], [(2S p)-2-ethenylferrocen-1-yl]{(2S p)-2-[(1R)-1-hydroxyethyl]ferrocen-1-yl}phenyl-(S)-phosphine sulfide, [Fe2(C5H5)2(C20H19OPS)], {(2S p)-2-[(1R)-1-(acetyloxy)ethyl]ferrocen-1-yl}{(2S p)-2-[(1R)-1-hydroxyethyl]ferrocen-1-yl}phenyl-(R)-phosphine sulfide, [Fe2(C5H5)2(C22H23O3PS)], and {(2S p)-2-[(1R)-1-benzylamino)ethyl]ferrocen-1-yl}[(2S p)-2-ethenylferrocen-1-yl]phenyl-(S)-phosphine sulfide, [Fe2(C5H5)2(C27H26NPS)]. All of the structures are accessible in one step from known precursors.

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