8275
A series of 17 , 17 - dialkyl - 3 , 14 - diaryltetrabenzofluorenes were efficiently prepared by using Suzuki - Miyaura cross - coupling reactions of the corresponding 3 , 14 - dibromo derivatives .
 Chemical: 17 , 17 - dialkyl - 3 , 14 - diaryltetrabenzofluorenes; Chemical: 3 , 14 - dibromo
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 17 , 17 - dialkyl - 3 , 14 - diaryltetrabenzofluorenes; Chemical: 3 , 14 - dibromo