syntax highlghting in vim

I have text files which have extensions *.sc. So to make syntax highlighting for some of the keywords in that type of text files I created ~/.vim/syntax/sc.cim. Below is the file content.

user $ cd ~/.vim/syntax/
user $ cat sc.vim 
" Syntax highlightor file for files ending in *.sc
syn keyword basicLanguageKeywords interface channel behavior
user $

Also I added following line to ~/.vimrc

au BufRead,BufNewFile *.sc set filetype=sc

Now I was hoping that when I do :set syntax=sc in vim, the syntax highlighting would be in effect for *.sc files. But it is not working.

What is wrong here ?