This phosphine, also known as (R)-(+)-5,5'-Bis(diphenylphosphino)-4,4'-bi-1,3-benzodioxole presents as a white to very pale yellow-red crystalline powder. Keep container tightly closed. Store in a cool and dark place under inert gas - this substance is air-sensitive. (R)-(+)-SEGPHOS(regR) is incompatible with oxidizing agents.