Selective hydrobromination method of olefinically unsaturated compounds
Selective hydrobromination method of olefinically unsaturated compounds in the presence of activators under the -20 to +50 °C is realised by hydrogen bromide or mixture of hydrogen chloride with hydrogen bromide, prepared by at least one technologically available methods, whilst at least one olefini...
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Main Authors | , , , , , |
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Format | Patent |
Language | English Slovak |
Published |
09.01.2003
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Summary: | Selective hydrobromination method of olefinically unsaturated compounds in the presence of activators under the -20 to +50 °C is realised by hydrogen bromide or mixture of hydrogen chloride with hydrogen bromide, prepared by at least one technologically available methods, whilst at least one olefinically unsaturated compound is introduced into the contact with the gas containing oxygen as an activator and hydrogen bromide or at least one olefinically unsaturated compound with the gas containing oxygen (particularly molecular oxygen) and the mixture of hydrogen chloride with dry hydrogen bromide and eventually another gas. Whilst the amount of oxygen (O2, O3, super-oxide) or of the mixture of oxygen with organic peroxide as an activator reaches 0.005 to 20 wt. % / olefinically unsaturated compounds. At least one part of the activator can affect the reactants before the hydrobromination step. The hydrobromination does not run without the activator, with the activator just hydrobromination and substantially "in anti-Markovnikov form".
Spôsob selektívnej hydrobromácie olefinicky nenasýtených zlúčenín za prítomnosti aktivátorov pri -20 až +50 °C sa uskutočňuje samotným bromovodíkom alebo zmesou chlorovodíka s bromovodíkom, pripravených aspoň jedným z technologicky dostupných postupov, pričom najmenej jedna olefinicky nenasýtená zlúčenina sa vedie do styku s kyslík obsahujúcim plynom ako aktivátorom a bromovodíkom alebo najmenej jedna olefinicky nenasýtená zlúčenina s kyslík obsahujúcim plynom (hlavne molekulovým kyslíkom) a zmesou chlorovodíka so suchým bromovodíkom a prípadne s ďalším plynom. Pritom množstvo kyslíka (O2, O3, super-oxid) alebo zmesi kyslíka s organickým peroxidom ako aktivátorom dosahuje 0,005 až 20 % hmotn./olefinicky nenasýtené zlúčeniny. Aspoň časťou aktivátora možno pôsobiť na reaktanty ešte pred stupňom hydrobromácie. Bez aktivátora neprebieha hydrobromácia, s aktivátorom len hydrobromácia a v podstate "antimarkovnikovsky".ŕ |
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Bibliography: | Application Number: SK19940000817 |