Why does query_posts only work in the sidebar?

I am trying to display the most recent posts in a specific category on the single page of an article before the comment section but it seems as though the query_posts just fails. If I grab the same following snippet and move it to the sidebar, it works just fine. Any ideas?

<?php query_posts(‘cat=4&showposts=10’); ?>

<?php while (have_posts()) : the_post(); ?>
• “><?php the_title(); ?>

<?php endwhile;?>