(iii) do a deal with company A to direct B to vote a particular...

(iii) do a deal with company A to direct B to vote a particular way.

But say you own 49% of the shares of company B your example - wouldn't you feel jipped?

I think the issue here is that Company A and company B are separate entities in the eyes of the law - transactions between them have to be valid. Company B giving up, for nothing, something worth a lot of money to company A would seem to violate the separate nature of the two entities. Leaving aside the issue of jipped shareholders, creditors in Company B would not be happy that's for sure. If you lend money to a company, then that company decides to give for free some of its assets to its owners, before bankrupting itself and defaulting on its debt, you'd be pretty peeved that's for sure.