C. F. Keil and Franz Delitzsch on Ecclesiastes 1:11

Ecc 1:11 “There is no remembrance of ancestors; and also of the later ones who shall come into existence, there will be no remembrance for them with those who shall come into existence after them.” With זכּרון (with Kametz) there is also זכרון, the more common form by our author, in accordance with the usage of his age; Gesen., Elst., and others regard it here and at Ecc 2:16 as constr., and thus לרא as virtually object-gen. (Jerome, non est priorum memoria); but such refinements of the old syntaxis ornata are not to be expected in our author: he changes (according to the traditional punctuation) here the initial sound, as at Ecc 1:17 the final sound, to oth and uth. אין ל is the contrast of היה ל: to attribute to one, to become partaker of. The use of the expression, “for them,” gives emphasis to the statement. “With those who shall come after,” points from the generation that is future to a remoter future, cf. Gen 33:2. The Kametz of the prep. is that of the recompens. art.; cf. Num 2:31, where it denotes “the last” among the four hosts; for there הא is meant of the last in order, as here it is meant of the remotely future time.