Methods for purifying tin compounds

A method for producing a tin compound having formula (A1) and having a purity of 95 mol % or more, the method comprising a step of distilling the tin compound, wherein the distillation step employs a distillation tower having multiple distillate outlets, and wherein the tin compound (A1) is obtained from a distillate outlet located below the highest outlet in a vertical direction of the distillation tower:

• RSnX3 (A1)
• wherein R is an organic group with 1 to 30 carbon atoms, which may be partially substituted with halogen, oxygen, or nitrogen atoms, X is selected from OR′ or NR′2, R′ is an organic group with 1 to 10 carbon atoms, which may be partially substituted with halogen, oxygen, or nitrogen atoms, when there are multiple R′ groups in the molecule, they may be the same or different in structure, and they may also be bonded to form a cyclic structure.

A method for producing a tin compound having formula (A1) and having a purity of 95 mol % or more, the method comprising a step of distilling the tin compound, wherein the distillation step employs a packed distillation tower equipped with insulation equipment and/or heating equipment:

• RSnX3 (A1)
• wherein R is an organic group with 1 to 30 carbon atoms, which may be partially substituted with halogen, oxygen, or nitrogen atoms. X is selected from OR′ or NR′2, R′ is an organic group with 1 to 10 carbon atoms, which may be partially substituted with halogen, oxygen, or nitrogen atoms, when there are multiple R′ groups in the molecule, they may be the same or different in structure, and they may also be bonded to form a cyclic structure.

A tin compound with a purity of 95 mol % or more and having formula (B1), wherein a content of each halogen atom (fluorine, chlorine, bromine, iodine) is 10 ppm or less by mass:

• RBSnXB3 (B1)
• wherein RB is an organic group with 1 to 30 carbon atoms, which may be partially substituted with oxygen or nitrogen atoms, XB is selected from OR′B or NR′B2, R′B is an organic group with 1 to 10 carbon atoms, which may be partially substituted with oxygen or nitrogen atoms, when there are multiple R′B groups in the molecule, they may be the same or different in structure, and they may also be bonded to form a cyclic structure.