Reaktion #55499

Reaktionsgleichung

sulfuric acid

2,2,6,6-tetramethyl-4-hydroxy-4-cyanopiperidine

sulfuric acid

acetic acid

→

2-iso-Octyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-spiro-[4,5]-decane

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter cooling the main portion of the solvent
2. 2
   workup.DISTILLATIONis distilled off under reduced pressure
3. 3
   Filtrationsuction-filtered
4. 4
   Sonstigethus yielding 292 g=69% of th

Vorschrift

182 g of 2,2,6,6-tetramethyl-4-hydroxy-4-cyanopiperidine, 284 g of isononyl-aldehyde and 200 g of concentrated sulfuric acid are stirred for 25 hours at 60° C. in 600 g of glacial acetic acid in a 2 liter apparatus with agitator. After cooling the main portion of the solvent is distilled off under reduced pressure. The residue is stirred with 500 ml of acetone and suction-filtered, thus yielding 292 g=69% of th. of the sulfuric acid salt of the intended compound.

Quelle