Method for preparing and processing catalyst solutions

A method for preparing a solution B comprising at least one catalyst in at least one second solvent, comprising the following steps:

• (A) providing a solution A comprising the at least one catalyst in at least one first solvent,
• (B) combining the solution A from step (A) with activated carbon,
• (C) removing the activated carbon from the solution A, and
• (D) exchanging the at least one first solvent in solution A for at least one second solvent to obtain the solution B, comprising the at least one catalyst in at least one second solvent,
• wherein the at least one catalyst is at least one cyclic tin compound of the formula (I), (II), (III), or (IV);
• where n>1,
• where n>1,
• where;
• D represents —O—, —S—or —N(R1)—,
• where R1 represents a saturated or unsaturated, linear or branched aliphatic or cycloaliphatic or an optionally substituted aromatic or araliphatic radical having up to 20 carbon atoms, which may optionally comprise heteroatoms from the group of oxygen, sulfur and nitrogen, or represents hydrogen or the radical
• D* represents —O—or —S—;
• X, Y and Z represent identical or different radicals selected from alkylene radicals of the formulae-C(R2)(R3)—, —C(R2)(R3)—C(R4)(R5)- or —C(R2)(R3)—C(R4)(R5)—C(R6)(R7)- or ortho-arylene radicals or the formulae
• wherein R2 to R11 independently of one another represent saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 20 carbon atoms, which may optionally comprise heteroatoms from the group of oxygen sulfur and nitrogen, or are hydrogen,
• L1 and L2 independently of one another represent —O—, —S—, —OC(═O)—, —SC(═O)—, —SC(═S)—, —OS(═O)2O—, —OS(═O)2—or —N(R12)—,
• wherein R12 represents a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or an optionally substituted aromatic or araliphatic radical having up to 20 carbon atoms and may optionally comprise heteroatoms from the group of oxygen, sulfur and nitrogen, or represents hydrogen;
• L3 and L4 independently of one another represent —OH, —SH, —OR13, —Hal, —OC(═O)R14, —SR15, —OC(═S)R16, —OS(═)2OR17, —OS(═O)2R18 or —NR19R20, or L3 and L4 together represent -L1-X-D-Y-L2-,
• wherein R13 to R20 independently of one another represent saturated or unsaturated linear or branched, aliphatic or cycloaliphatic or optionally substituted aromatic or araliphatic radicals having up to 20 carbon atoms, which may optionally comprise heteroatoms from the group of oxygen, sulfur and nitrogen, or are hydrogen.