Rif Brachot 31a

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31a
{Brachot 42b}
ALTHOUGH THE PERFUME IS NOT BROUGHT IN TILL AFTER THE MEAL.

Gemara:
Specifically when they reclined does one bless Hamotzi for all of them.
But if they did not recline, no.

And if they say: let us go and eat bread in this particular place, then even if they did not recline, but rather each one eats from his own loaf, it is as if they established {the meal together}, and one blesses {HaMotzi} for all of them, as we learnt {in a brayta}:

If 10 were 10 travelling on the road, even if they all eat from a single loaf, each one must make the blessing for himself. If they sat down to eat, even if each ate from his own loaf, one blesses for all of them, and we establish this such that, for example, they say "Let us go and eat bread in this particular place."

{Brachot 43a}
And wine, too requires reclining {for them to form a group such that one blesses on behalf of everyone} like Rabbi Yochanan (for Rabbi Yochanan said) And if they recline one blesses for all of them Borei Peri HaGafen. And if they did not recline, each one blesses for himself.

They asked Ben Zoma: for what reason do they say that if wine was brought within the meal, each blesses for himself?
He said to them: Because {during the meal} the gullet is not empty. {and they won't be able to answer Amen; or Rashi - since their attention will be towards swallowing and not on he that blesses.}

{The Mishna had said:}"THE SAME ONE SAYS [THE BENEDICTION] OVER THE PERFUME":

From this we deduce that there is one superior than him {who could have said it, but yet he is the one to say the blessing over the perfume}.

{The gemara had, but Rif does not cite: Why? Because he washed his hands first after the meal.}

This supports Rav, for Rav Chiyya bar Ashi cited Rav: One who washes his hands at the end {of the meal} first is prepared {who has the right} for the blessing {of grace after the meal}.

R Zera cited R Yirmiya: From when does he bless on the perfume? From the time the smoke column ascends.