ISSN:
0044-2313
Keywords:
Organic silicic acid derivatives
;
cage-like structures
;
hydrosilylation
;
n.m.r. spectroscopy
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Reaction of the Cage-like Silicic Acid Derivative [(CH3)2HSi]8Si8O20 with Unsaturated Organic CompoundsBy 29Si, 1H, and 13C NMR investigations were shown that the eight HSi≡groups of the double four-ring silicic acid derivative [(CH3)2HSi]8Si8O20 react with the following unsaturated compounds: vinylcyclohexene, allyl glycidyl ether, methyl methacrylate, octadecene-1, and styrene. The resulting oily products are soluble in organic solvents. The compounds were characterized by the chemical shifts of the 29Si, 1H, and 13C NMR signals. Their formulae are [C6H9(CH2)2Si(CH3)2]8Si8O20, [CH3OOCCH(CH3)CH2Si(CH3)2]8Si8O20, [CH3(CH2)17Si(CH3)2]8Si8O20 and [C6H5(CH2)2Si(CH3)2]8Si8O20, and [C6H5CH(CH3)Si(CH3)2]8 Si8O20, respectively. Mainly the addition reactions do not follow the Markovnikov rule.
Notes:
29Si-, 1H- und 13C-NMR-Untersuchungen zeigen, daß das Doppelvierring-kieselsäurederivat [(CH3)2HSi]8Si8O20 mit seinen acht HSi≡Gruppen pro Molekül Additionsreaktionen mit den einfach ungesättigten Verbindungen Vinylcyclohexen, Allylglycidylether, Methacrylsäuremethylester, Octadecen-1 und Styren eingeht. Die Addition erfolgt überwiegend entgegen der Markovnikov-Regel.Als Reaktionsprodukte werden meist ölartige, in organischen Lösungsmitteln lösliche Verbindungen der Formeln [C6H9(CH2)2Si(CH3)2]8Si8O20, [CH3OOCCH(CH3)CH2Si(CH3)2]8Si8O20, CH3(CH2)17Si([CH3)2]8Si8O20 und [C6H5(CH2)2Si(CH3)2]8Si8O20 bzw. [C6H5CH(CH3)Si(CH3)2]8Si8O20 erhalten, die durch die chemischen Verschiebungen der 29Si-, 1H- und 13C-NMR-Signale charakterisiert werden.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19915960109
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