Substituent effect on the lifetime of Localized Singlet Biradicals with pai single-bonded character

Abstract

We have previously found that the introduction of alkoxy-groups at the C(2) position of cyclopentane-1,3-diyls makes the singlet the ground-state spin-multiplicity. The lifetime of the singlet biradicals was found to be dependent on the chain-length of the alkoxy-group. In this study, unsymmetrically substituted acetal moiety was introduced at the C(2) position to clarify the role of the substituents. We will discuss the detail mechanism of the reactivity of the singlet diradicals with  single-bonded character.