1. 
   Cross-conjugation
   Cross-conjugation is a special type of conjugation in a molecule, when in a set of three Pi bonds only two pi-bonds interact with each other by conjugation, the third one is excluded from interaction. In classical terms it means that the strict alternation of single and double bonds—CH=CH–CH=CH...
   Found op http://en.wikipedia.org/wiki/Cross-conjugation
   
   
2. 
   cross-conjugation
   In a system XC₆H₄GY this is conjugation involving the substituent X, the benzene ring, and the side-chain connective-plus-reaction site GY, i.e. either X is a +R group and GY is a -R group, or X is a -R group and GY is a +R group. In Hammett correlations this situation can lead...
   Found op http://www.chem.qmul.ac.uk/iupac/gtpoc/CoCy.html
   
   

Tip: double click on a word to show its meaning.