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Suunnzary. Photoelectron spectroscopy has been used to examine the conseqncnces of steric inhibition of conjugation in a distorted vinyl sulfide and vinyl ether. Based upon the degree of interaction a deviation from coplanarity of 70"-75" is calculated for 9-oxabicyclo[3.3.ljnon-l-ene (3) and approximately 75"-80" for the sulfur analog 6 .Twisting two conjugated, individually planar n-systems K and S by an angle @ES with respect to each other produce:; changes in the electronic structure of the molecule R-S. Within the framework of a simple HXO-type model these changes are linked to the decrease of the crossteri-u,

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