Reaktion #2032446

Reaktionsgleichung

methyl oleate

1,18-dimethyl-9-octadecenedicarboxylic acid

9-octadecene

→

2-decyl-[1,3]dioxolane

Lösungsmittel

ethylene glycol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAfter 5, 30 and 60 minutes
2. 2
   Sonstigeafter 60 minutes

Vorschrift

A mixture of 2-undecen-1-ol and methyl 11-hydroxy-9-undecenoate (0.5 ml, obtained from the cross-metathesis of methyl oleate with butenediol; composition: 8.7% methyl oleate, 13.2% 9-octadecene and 1,18-dimethyl-9-octadecenedicarboxylic acid, 61.2% alcohol cross-metathesis products, 16.9% aldehyde cross-metathesis products) and 4.5 ml of ethylene glycol are combined. Further samples are taken for GC, GC-MS and GPC. By means of a magnetic stirrer, the reaction mixture is stirred at 120° C. for 60 minutes. After 5, 30 and 60 minutes the samples for GC, GC-MS and GPC measurements are taken and the reaction is stopped. Conversion of both alcohol cross-metathesis products after 60 minutes: 90%. Total yield (over two steps) of the 2-decyl-[1,3]dioxolane (protected undecanal): 67%; total yield (over two steps) of the methyl undecanoate-11-[1,3]dioxolane (protected methyl 11-oxoundecanoate): 69%; by-products (oligomers): 5%.

Quelle