| 摘要 |
<p>There is described a method for splitting at least one disulphide bond -S-S-, where each of the sulphur atoms is directly bound covalently to its respective aliphatic carbon atom in an organic substance which contains at least one such disulphide bond, in which each bond -S-S- which is split is converted substantially to two reactive groups of the formulae -S-S-R1 and R2-S-S-, where R1 and R2 are equal or different and each is an organic residue. Splitting of the bond is effected by reacting said organic substance with a mixture of a compound R3-S-S-R4 and a compound capable of existing in the tautomeric forms R5-S-H and HR5 = S or corresponding resonance-stabilised anion forms, in which compounds the residues R3, R4 and R5 i) are organic residues of which all are different, two are equal or all are equal, and ii) are defined in a) that each of the aforesaid sulphur atoms in the compounds R3-S-S-R4 and R5-S-H is bound to a carbon atom in an aromatic ring and b) that under prevailing splitting conditions a compound R3-S-H or R4-S-H released by the reaction of the compound R3-S-S-R4 and the compound R5-S-H exist substantially in their tautomeric forms HR3 = S, HR4 = S and HR5 = S respectively, or corresponding resonance-stabilized anion forms. In each of the groups -S-S-R1 and R2-S-S- produced by splitting the disulphide bond, R1 and R2 are each a residue of the group which consists of R3, R4 and R5. The invention also relates to an organic compound produced by the aforesaid splitting and exhibiting at least one group -S-S-R1 and/or R2-S-S- bound covalently to an aliphatic carbon atom, in which groups R1 and R2 have the aforegiven significance. </p> |
