21424
Nickel and Cobalt - Catalyzed Coupling of Alkyl Halides with Alkenes via Heck Reactions and Radical Conjugate Addition .
 Chemical: Nickel; Chemical: Cobalt; Chemical: Alkyl Halides; Chemical: Alkenes
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: Nickel; Chemical: Cobalt; Chemical: Alkyl Halides; Chemical: Alkenes