Suzuki Cross-Coupling work-up question

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worryingchem
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Hi, in class I'm doing a Suzuki Cross Coupling reaction based on
"Nickel-Catalyzed SuzukiMiyaura
Couplings in Green Solvents" by Stephen D. Ramgren, Liana Hie, Yuxuan Ye, and Neil K. Garg.
The reaction involved the bromo-aryl reacting with the boronic acid in heated t-amyl alcohol in the presence of NiCl2(PCy3)2 and tripotassium phosphate.

During the work-up, the first thing we did was transferred our solvent into a test tube of 1M HCl. The product is supposed to be in the aqueous layer, but I don't know how a biphenyl product would dissolve in the aqueous layer.
Can someone clear this up for me? Thank you.
Scheme of a Suzuki cross-coupling: 4-substituted bromobenzene (R1) plus 4-substituted phenylboronic acid (R2) with NiCl2(PCy3)2 and K3PO4 in t-amyl alcohol under hv gives a biphenyl with R1 and R2 at the para positions.
 
Can you think of any organic molecules that are soluble in 1M HCl?
What are R1 and R2?