A compound of formula I: I: wherein L1, L2, L3, and L4 are each independently selected from -O- and -S-; R1, R3, R1', and R3' each independently represent a divalent aliphatic, araliphatic, cycloaliphatic or aromatic group having up to 20 carbon atoms, which can optionally contain one or more heteroatom selected from the group consisting of oxygen, sulfur and nitrogen; R2 and R2' represent a divalent aliphatic group having up to 20 carbon atoms; R4, R5, R4', and R5' each independently represent hydrogen or a monovalent residue derived from reaction of a respective N-H group with an isocyanate, an ethylenically unsaturated compound, a lactone, a dilactone, a thiolactone, a lactam, a thiolactam, a carboxylic acid or derivative thereof, or an epoxide; wherein the compound comprises a reaction product of: (i) a tin compound; and (ii) an adduct of: (a) a compound having two secondary amine groups and two additional active hydrogen-containing functional groups; and (b) a reactant comprising an isocyanate, an ethylenically unsaturated compound, a lactone, a dilactone, a thiolactone, a lactam, a thiolactam, a carboxylic acid or derivative thereof, and/or an epoxide; wherein the compound (a) having two secondary amine groups and two additional active hydrogen-containing functional groups comprises an N, N'-substituted alkylene diamine derivative. I: wherein L1, L2, L3, and L4 are each independently selected from -O- and -S-; R1, R3, R1', and R3' each independently represent a divalent aliphatic, araliphatic, cycloaliphatic or aromatic group having up to 20 carbon atoms, which can optionally contain one or more heteroatom selected from the group consisting of oxygen, sulfur and nitrogen; R2 and R2' represent a divalent aliphatic group having up to 20 carbon atoms; R4, R5, R4', and R5' each independently represent hydrogen or a monovalent residue derived from reaction of a respective N-H group with an isocyanate, an ethylenically unsaturated compound, a lactone, a dilactone, a thiolactone, a lactam, a thiolactam, a carboxylic acid or derivative thereof, or an epoxide; wherein the compound comprises a reaction product of: (i) a tin compound; and (ii) an adduct of: (a) a compound having two secondary amine groups and two additional active hydrogen-containing functional groups; and (b) a reactant comprising an isocyanate, an ethylenically unsaturated compound, a lactone, a dilactone, a thiolactone, a lactam, a thiolactam, a carboxylic acid or derivative thereof, and/or an epoxide; wherein the compound (a) having two secondary amine groups and two additional active hydrogen-containing functional groups comprises an N, N'-substituted alkylene diamine derivative. L1, L2, L3, and L4 are each independently selected from -O- and -S-; R1, R3, R1', and R3' each independently represent a divalent aliphatic, araliphatic, cycloaliphatic or aromatic group having up to 20 carbon atoms, which can optionally contain one or more heteroatom selected from the group consisting of oxygen, sulfur and nitrogen; R2 and R2' represent a divalent aliphatic group having up to 20 carbon atoms; R4, R5, R4', and R5' each independently represent hydrogen or a monovalent residue derived from reaction of a respective N-H group with an isocyanate, an ethylenically unsaturated compound, a lactone, a dilactone, a thiolactone, a lactam, a thiolactam, a carboxylic acid or derivative thereof, or an epoxide; wherein the compound comprises a reaction product of: (i) a tin compound; and (ii) an adduct of: (a) a compound having two secondary amine groups and two additional active hydrogen-containing functional groups; and (b) a reactant comprising an isocyanate, an ethylenically unsaturated compound, a lactone, a dilactone, a thiolactone, a lactam, a thiolactam, a carboxylic acid or derivative thereof, and/or an epoxide; (i) a tin compound; and (ii) an adduct of: (a) a compound having two secondary amine groups and two additional active hydrogen-containing functional groups; and (b) a reactant comprising an isocyanate, an ethylenically unsaturated compound, a lactone, a dilactone, a thiolactone, a lactam, a thiolactam, a carboxylic acid or derivative thereof, and/or an epoxide; (a) a compound having two secondary amine groups and two additional active hydrogen-containing functional groups; and (b) a reactant comprising an isocyanate, an ethylenically unsaturated compound, a lactone, a dilactone, a thiolactone, a lactam, a thiolactam, a carboxylic acid or derivative thereof, and/or an epoxide; wherein the compound (a) having two secondary amine groups and two additional active hydrogen-containing functional groups comprises an N, N'-substituted alkylene diamine derivative.