No Sidebar for Pages and Sidebar for Blog

Hello Everyone, I am trying to figure out how to do the following. I want to have the front page with a sidebar, the inside pages without no sidebar and then the blog (posts) have a sidebar. Below is my script and I am running the Twenty Twelve theme.

<?php if ( is_front_page() ) { ?>

<?php if ( is_active_sidebar( ‘sidebar-1’ ) ) : ?>
<div id=”secondary” class=”widget-area” role=”complementary”>
<?php dynamic_sidebar( ‘sidebar-1’ ); ?>
</div><!– #secondary –>
<?php endif; ?>

<?php } else { ?>

<?php }?>

Any help would be great.

Thank you!