[plt-scheme] quasiquote?

> (define name 'sscanf)
> (define args '(string format-string . args))
> `(,name . ,args)
(sscanf string format-string . args)
> `(,name , at args)
. append: expects argument of type <proper list>; given (string format-string . args)
>

 From my experience with Common Lisp i expected the two quasiquote expressions to print the same.   Am i doing somethine wrong in Scheme or is this a bug?
I'm using  200alpha12 (iteration 0)