The He(I) photoelectron (PE) spectra of the diphosphacyclobutadienes 2 and 3 have been recorded. The interpretation of the first PE bands is based on SCF‐MO calculations (MNDO method). It is found that the first two bands correspond to π‐MOs which are mainly localized in the four‐membered ring. The first two bands are shifted towards higher energy in the PE spectrum of 3 ; we ascribe this to an electron transfer from the four‐membered ring in 3 to the phenyl substituents.
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Veszprémi et al. (1988) studied this question.
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