Latin dunc

if I have to believe my dictionary, the "dunc" shouldn't be a form
resulted from *dum-que and it is not a syncoped form from "do:nec" but
it is a form which has been builded as tum - >tunc, thus dunc is from
"dum".

Rom. has "deci" for the meaning of "therefore", (equivalent of French
"donc", Italian "dunque") with a strange "e" there, thus the word is
considered to be a new building from "de"(begining with) +"aci" (here),
but not from Latin "dunc". I don't pay too much to this explanation
because phoneticaly it doesnt matches. "de" has the alternation "d�" and
de+aci = d� aci > da-ci(absorbtion of "�" into next "a" d� aci > d'aci).

Questions:

-has Latin "dum" a cognate in Greek "de" here?
-when has been "tunc" replaced by "dunc" in Latin?
-is there in Romance any romance which still use a derivative
of "tunc" instead of a derivative of "dunc"?

Alex




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