24476
Mechanistic experiments suggested that C - H activation is turnover - limiting and irreversible and that insertion of the diazo compound favors electron - deficient substrates .
 Chemical: C - H; Chemical: diazo
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: C - H; Chemical: diazo