How to move from a subdirectory to root directory using .htaccess

See more:

PHP

web_development

I have to move one step back to root directory.
I have a sub directory "products". There is a file product.php in this directory.

I want to redirect this URL

http://www.example.com/products/product.php

To

http://www.example.com/catalog.php

for this I have written the following rule

RewriteRule ^products/product.php catalog.php

But This rule takes to

http://www.example.com/products/catalog.php

while catalog.php exists in root directory.

How can I set the RewriteRule to move it to root directory.

Note: I don't want to give the absolute path http://www.example.com/catalog.php to move it to root directory.