Translate the given Spanish text to English

[EX Q]: Methods of preparing the copper compositions are also disclosed.
[EX A]: Tambien se describen metodos para preparar las composiciones de cobre.

[EX Q]: ; and ring A represents phenyl, etc.)
[EX A]: ; y el anillo A representa fenilo, etc.

[EX Q]: ; R3 may be hydrogen, CN, C1-C6-alkyl, etc.
[EX A]:
; R3 puede ser hidrógeno, CN, C1-C6-alquilo, etc.