SYNTHESIS AND CHARACTERIZATION OF KINETICALLY STABILIZED 1,3-DIPHOSPHACYCLOBUTENE DERIVATIVES

Abstract

1-(2,4,6-Tri-tert-butylphenyl)-2-phosphaethyne (1) was allowed to react with 0.5 equiv of an alkyllithium and subsequently with an alcohol to afford a bulky 1,3-diphosphacyclobutene, and its structure and coordination properties on transition metals were investigated. On the other hand, 1 was allowed to react with an alkyllithium and iodomethane to form a stable biradical, 1,3-diphosphacyclobutane-2,4-diyl.

Keywords:

• 1,3-Diphosphacyclobutene
• biradical
• kinetic stabilization
• phosphaalkyne
• phosphorus

This work was supported in part by Grants-in-Aid for Scientific Research (No. 13304049 and 14044012) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.