N,N-Dimethylglycine → trans-Stilbene

Beteiligte Stoffe

Reaktionsschritte

To a reaction vessel standing on a scale which is sealed with a septum cap, 5.3 mg (0.02 mmol) of (CH3CN)2PdCl2, 45 mg (0.12 mmol) of Ph4PCl and 12.4 mg (0.12 mmol) of dimethylglycine are added, followed by two cycles of evacuation and flushing with argon. Under argon, 657.7 mg (8 mmol) of anhydrous sodium acetate and 1 ml of NMP are added. 452 mg (4.01 mmol) of Cl-benzene and 636 mg (6.11 mmol) of styrene is mixed with 1 ml of NMP and added dropwise in 6 portions within 6 hours, the first portion being added at room temperature and the others at 140° C. Stirring is performed at 140° C. for a total of 24 h. According to the processing described in Example 1 using 10 ml of diethyl ether, a 64.2% yield of Heck products (97.4% trans-stilbene, 0.6% cis-stilbene, and 2.0%- 1,1-diphenylethene) is obtained with 76.6% conversion of Cl-benzene.

Herkunft & Nachweise