simultaneous reactions

https://doi.org/10.1351/goldbook.S05680
Composite
reactions, in which processes like A 1 Y and B 2 Z occur in parallel, can be called simultaneous or
parallel reactions
. Sometimes there is
competition
involved, like in the scheme: A+B 1 Y and A+C 2 Z where B and C compete with one another for A.
Source:
PAC, 1993, 65, 2291. (Nomenclature of kinetic methods of analysis (IUPAC Recommendations 1993)) on page 2297 [Terms] [Paper]