14557
Accordingly , in this work , 11 novel hybrid - boron - containing molecules , namely eight 1 , 4 - dihydropyridines and three 3 , 4 - dihydropyrimidinones , derived from formylphenylboronic acids ( ortho , meta and para ) , were obtained using a green approach , involving H - 4CR and B - 3CR practices , in the presence of ethanol , which is a green solvent , and using three comparatively different modes of activation ( mantle heating , yield 3 % - 7 % in 24 h , Infrared Radiation ( IR ) irradiation , yield 12 % - 17 % in 12 h , and microwave irradiation , yield 18 % - 80 % , requiring very low reaction times of 0 . 25 - 0 . 33 h ) .
 boron, 1 , 4 - dihydropyridines, 3 , 4 - dihydropyrimidinones, formylphenylboronic acids, ethanol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 boron, 1 , 4 - dihydropyridines, 3 , 4 - dihydropyrimidinones, formylphenylboronic acids, ethanol