Thank you for your reply , to answer your question, peptide coupling. Yes I understand you what you say makes since.
but the literature I am reading calls for Pyrrolidine (2 mole) is slowly added to 164 ml conc. HCl in 400 g ice water and the pH was adjusted to 3-4.
The literature has no more details than this. So do you think maybe the author adjusted the pH with more HCL? Sorry for my English but it is not my native tongue.