insert pair doesn't work with *, $ and %

[Dieter Wilhelm]

Hi

For a special mode I'd like to have key bindings duplicating various
characters like e. g.

(global-set-key "\C-c{" 'insert-pair)

this does work as expected (I'm getting a pair of {} and the point is
within the pair).  But I can't get the analogous with *, $ and % to
run, I'm just getting one of these characters back and not a pair.
What am I missing here?

-- 
    Best wishes

    H. Dieter Wilhelm
    Darmstadt, Germany