Sterically hindered organotin compounds. Part 3. The reaction between di-tert-butyltin oxide and organoboronic acids

Abstract

The reaction between (Bu^t₂SnO)₃ and BR(OH)₂[R = Ph or 2,4,6-Me₃C₆H₂(mes)] has been investigated and found to yield two classes of product. The first is a boron-rich species, cyclo-Bu^t₂SnO(RBO)₂, which exists alongside its acyclic hydrolysis product SnBu^t₂[OB(OH)R]₂. The second product, which is tin-rich, SnBu^t₂(OH)₂[(Bu^t₂SnO)₂OBR]₂, can be formulated as cyclo-RBO(Bu^t₂SnO)₂ chelated across one Sn–O–Sn unit by a molecule of SnBu^t₂(OH)₂. The crystal and molecular structures of SnBu^t₂[OB(OH)Ph]₂ and SnBu^t₂(OH)₂[(Bu^t₂SnO)₂OBC₆H₂Me₃-2,4,6]₂·2MeCN have been determined.