find don't accept -exec argument

[tipoll]

Hello

I have a problem to call find out of tcl
All of these lines fail with the same error message

exec find -exec ls -l \{\}{\;}
eval [ list exec find -exec ls -l \{\}{\;} ]

find: missing argument to `-exec'
This happens if -exec is not closed with \;

I tried

% exec echo {\;}

to figure out what the shell would get from tcl and there
it is

\;

Why is my find command not closed properly and is there a
better way to pass commands to the shell?

Thanks for your help!