Is there a way to sync bookmarks between chrome and safari on an ongoing basis? I have Chrome and Safari both installed on my Mac.

My underlying need is wanting to use Chrome on my MacBook Pro and to have all bookmarks I create to sync to mobile Safari on my iOS devices.   

Yes, I could just use chrome on my iPhone, but I don't want to as iOS directs other apps to always open URL in Mobile Safari.

Is there a way to have two way sync from OS X Chrome to iOS Mobile Safari whether through a cloud service or my Mac which can run 24/7?
The chrome extension "Xmarks" may serve your needs. The extension syncs bookmarks between computers.
https://chrome.google.com/webstore/detail/ajpgkpeckebdhofmmjfgcjjiiejpodla
seems to be available for both chrome and safari. Then if you use icloud sync, bookmarks "should" propagate to your mobile device. Changes on the idevice would propagate back to desktop safari. What is unknown, is if you would have to periodically launch Safari on the mac to get things in sync. NOTE that this solution runs on PCs only (Using a '.com' ap / program). If on Apple only, will work only if your Mac also runs Windows.