ChemInform Abstract: INFLUENCE OF ANGLE STRAIN ON THE STEREOCHEMISTRY OF THE NUCLEOPHILIC DISPLACEMENTS AT SILICON: STEREOCHEMICAL BEHAVIOR OF OPTICALLY ACTIVE SYSTEMS CONTAINING BOTH AN INTRACYCLIC SILICON ATOM AND AN INTRACYCLIC LEAVING GROUP

1981 ◽  
Vol 12 (1) ◽  
Author(s):  
R. CORRIU ◽  
C. GUERIN
Keyword(s):  
Silicon Atom ◽  
Optically Active ◽  
Active Systems ◽  
Leaving Group

scholarly journals Preparation of optically active bicyclodihydrosiloles by a radical cascade reaction

2013 ◽  
Vol 9 ◽  
pp. 1326-1332 ◽  
Author(s):  
Koichiro Miyazaki ◽  
Yu Yamane ◽  
Ryuichiro Yo ◽  
Hidemitsu Uno ◽  
Akio Kamimura
Keyword(s):  
Silicon Atom ◽  
Cascade Reaction ◽  
Radical Cyclization ◽  
Optically Active ◽  
Unsaturated Ester ◽  
Terminal Alkyne ◽  
Silyl Radical ◽  
Vinyl Radical ◽  
Radical Cascade ◽  
Carbonyl Radical

Bicyclodihydrosiloles were readily prepared from optically active enyne compounds by a radical cascade reaction triggered by tris(trimethylsilyl)silane ((Me3Si)3SiH). The reaction was initiated by the addition of a silyl radical to an α,β-unsaturated ester, forming an α-carbonyl radical that underwent radical cyclization to a terminal alkyne unit. The resulting vinyl radical attacked the silicon atom in an SHi manner to give dihydrosilole. The reaction preferentially formed trans isomers of bicyclosiloles with an approximately 7:3 to 9:1 selectivity.

Depolarization of Scattered Light by Optically Active Systems

1965 ◽  
Vol 69 (2) ◽  
pp. 689-691 ◽  
Author(s):  
P. F. Mijnlieff ◽  
H. Zeldenrust
Keyword(s):  
Scattered Light ◽  
Optically Active ◽  
Active Systems

Synthesis & Characterization of Optically-Active Lanthanide-Doped Hybrid Inorganic-Organic Systems

1999 ◽  
Vol 576 ◽  
Author(s):  
R.E. Taylor-Smith ◽  
K. M. Choi
Keyword(s):  
Sol Gel ◽  
Systems Design ◽  
Optically Active ◽  
Materials Chemistry ◽  
Active Systems ◽  
Organic Systems ◽  
Bridged Silsesquioxane ◽  
Molecular Composites ◽  
Rare Earth Doped

ABSTRACTThe materials chemistry of sol-gel-derived inorganic-organic molecular composites offers significant potential for molecular-level systems design. One focus in this arena is the chemical design and microstructural engineering of optically-active systems. We report the generation of rare-earth-doped inorganic-organic hybrids, based on a bridged polysilsesquioxane architecture. Derived from lanthanide precursors such as Erbium isopropoxide, which we co-condense with the requisite silsesquioxane monomer, these systems exhibit significant optical activity. In experiments on hybrids doped with Erbium, we conclusively demonstrate strong fluorescence at wavelengths in the vicinity of 1540 nm, from stimulation with 488 nm radiation. We discuss materials-driven impacts of the bridged-silsesquioxane architecture on system complexities arising from the solution sol-gel route which would affect fluorescence efficiencies and luminescence levels, such as hydroxyl impurities and clustering-effects.

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