Sterically hindered organotin compounds. Part 3. The reaction between di-tert-butyltin oxide and organoboronic acids
Abstract
The reaction between (But2SnO)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-But2SnO(RBO)2, which exists alongside its acyclic hydrolysis product SnBut2[OB(OH)R]2. The second product, which is tin-rich, SnBut2(OH)2[(But2SnO)2OBR]2, can be formulated as cyclo-RBO(But2SnO)2 chelated across one Sn–O–Sn unit by a molecule of SnBut2(OH)2. The crystal and molecular structures of SnBut2[OB(OH)Ph]2 and SnBut2(OH)2[(But2SnO)2OBC6H2Me3-2,4,6]2·2MeCN have been determined.