unable to convert .htaccess to web.config

For this pc of code

<IfModule mod_rewrite.c>
RewriteEngine On
#RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
</IfModule>

i am using

<rule name="rule 1A" stopProcessing="true">
<match url="."  />
<action type="Rewrite" url="/index.php"  />
</rule>

but not work... why ?