It seems like your sentence was cut off. If you're trying to say that none of you expected the chairman to do something specific, you might complete the sentence like this:

"None of us expected the chairman to [verb] [object]."

For example:

• "None of us expected the chairman to show up."
• "None of us expected the chairman to resign."
• "None of us expected the chairman to give such a long speech."

Could you please provide more details so I can help you complete the sentence appropriately?