تفاعل #820027

معادلة التفاعل

phenylglyoxylic acid (2-hydroxyethoxy)ethyl ester

4,4′-diphenylmethane diisocyanate

→

Phenylglyoxylic acid 2-{2-[4-(4-isocyanatobenzyl)-phenylcarbamoyloxy]-ethoxy}-ethyl ester

المذيبات

toluene

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONinitial charge in a 50 ml multi-necked flask
2. 2
   درجة الحرارةthe solution is cooled
3. 3
   تركيزthe toluene is concentrated
4. 4
   أخرىa rotary evaporator
5. 5
   أخرىThe residue is dried under a high vacuum for two hours
6. 6
   أخرى4.6 g of a viscous, slightly brownish oil are obtained

الإجراء التجريبي

Under argon gas, 2.14 g of the phenylglyoxylic acid (2-hydroxyethoxy)ethyl ester from Example 1 and 2.24 g of 4,4′-diphenylmethane diisocyanate (Desmodur VL, Bayer) in 15 g of toluene are placed as the initial charge in a 50 ml multi-necked flask and refluxed at 110° C. After 19 hours, the solution is cooled and the toluene is concentrated using a rotary evaporator. The residue is dried under a high vacuum for two hours. 4.6 g of a viscous, slightly brownish oil are obtained. The conversion and the composition of the product mixture are verified by 1H-NMR spectrum and IR spectrum (NCO bands).

المصدر