Chemical Properties of 3a,6a-Diaza-1,4-diphosphapentalenes. Addition of p -Ditolyl Disulfide

Reaction of cyclohexane-annulated 3a,6a-diaza-1,4-diphosphapentalene with p -ditolyl disulfide gives the 1,4-adduct, while the double-decker ditriflate based on 2,3,5,6-tetramethyl-1 H ,4 H -3a,6a-diaza-1,4-diphosphapentalene leads to the cross-deck adduct. The type of addition depends on the location of the HOMO: on the π-system of diazadiphosphapentalene in the first case, and in the interdeck space in the second.