Determining the Conformational Landscape of σ and π Coupling Using <i>para</i>-Phenylene and “Aviram–Ratner” Bridges
作者:Daniel E. Stasiw、Jinyuan Zhang、Guangbin Wang、Ranjana Dangi、Benjamin W. Stein、David A. Shultz、Martin L. Kirk、Lukasz Wojtas、Roger D. Sommer
DOI:10.1021/jacs.5b04629
日期:2015.7.29
donor-bridge-acceptor (D-B-A) electronic coupling matrix elements (H(DA), determined from the magnetic exchange coupling, J) involving a spin SD = 1/2 metal semiquinone (Zn-SQ) donor and a spin S(A) = 1/2 nitronylnitroxide (NN) acceptor mediated by the σ/π-systems of para-phenylene and methyl-substituted para-phenylene bridges and by the σ-system of a bicyclo[2.2.2]octane (BCO) bridge are presented and discussed
the solid state efficiently for aldehydes whose (E)-photoenols (i) are more stable than their corresponding benzocyclobutenols and (ii) are not sterically congested. However, rapid cyclization to benzocyclobutenols is found to be the sole pathway for sterically encumbered (E)-enols derived from aldehydes 6−8. Given that the execution of heteromolecular reactions in the solid state is a challenge, the