as soon as vs whereupon

as soon as

conj
  • At the moment when; immediately after. 

  • Used other than figuratively or idiomatically: see as, soon. 

  • Used to indicate that the first action mentioned is as likely as, or is preferred to, the second action mentioned. 

prep
  • Used other than figuratively or idiomatically: see as, soon. 

whereupon

conj
  • After which, in consequence. 

  • Upon which. 

How often have the words as soon as and whereupon occurred in a corpus of books? (source: Google Ngram Viewer )