Remove sidebar in single.php

you can take the easy/hack approach and remove it with css instead, paste this in singles.php right after <?php get_header(); ?>

<style type='text/css'>
.right_sidebar #sidebar { display:none !important; }/*hides sidebar*/
.right_sidebar #content { background: white !important; } /*removes gray sidebar color*/
.right_sidebar #main,
.right_sidebar #main_inner { width: Xpx !important; } /*where Xxp is whatever width you want the main column*/
</style>

it’s not the best way to do it, but should do the trick.