Turkey edge five-goal thriller
The dismissal of Vincent Kompany just after the hour hit Belgian hopes and Guus Hiddink's side duly capitalised when Semih Senturk fired home.
Van Buyten's second of the night put Belgium on course for an unlikely point before Arda Turan popped up to win it inside the final 15 minutes as Turkey maintained their perfect start to the group following Friday's victory over Kazakhstan.
Belgium coach Georges Leekens, meanwhile, must be rueing his luck after seeing his side again emerge with nothing to show from a strong display following on from their narrow 1-0 loss to Germany four days ago.
Belgium went ahead after 28 minutes from a set-piece which caught the hosts napping. Toby Alderweireld's corner evaded the Turkish backline and Van Buyten had a simple job to bury a header high into the roof of the net.
Turkey almost hit back immediately when Altintop let fly with a long-range effort that sailed over the bar, but the hosts would have to wait until the second period to get back on level terms.
Five minutes after the restart Ismail Koybasi worked his way to the right side of the penalty area before sending over a cross which found Altintop, whose initial effort was saved by Logan Bailly before the Bayern Munich midfielder buried the rebound.
Belgium's hopes of holding on for a point were hit after 64 minutes when Kompany picked up a second yellow card for a badly timed challenge on Altintop, and Turkey wasted no time in capitalising on their advantage.
Just three minutes later Turan fired over an inviting cross from the right and Senturk reacted quickest to sweep the ball home from inside the six-yard box.
The visitors refused to lie down, however, and against the odds dredged up an equaliser moments later when Kevin Mirallas' header was flicked on by Romelu Lukaku and Van Buyten claimed his second of the night with a firm header.
Turkey still had something left in the tank and pushed forward in search of the winner.
It arrived 12 minutes from time when Altintop's corner was only half-cleared by Bayern team-mate Van Buyten. Gokhan Gonul picked up on the loose ball and sent over an inviting cross from which Turan turned home a dramatic winner.