imapping issue

Hallo.

On Vim I want to imap the following sequence of command under the hotkey
Ctrl-S:

imap <C-S> <Esc>:w<Enter>i
imap <Ctrl>S <Esc>:w<Enter>i

but it doesnt work, nor the first version nor the second one.

It works properly if I change hotkey, for example:

imap <F12> <Esc>:w<Enter>i

works as one can expect.

What is wrong with Ctrl_S?

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