| 主权项 |
1. A mixture, comprising:
a compound of the structure Ia: whereinR1 is selected from the group consisting of—(C1-C12)-alkyl, and —(C3-C12)-cycloalkyl,andR2, R3 are each independently selected from the group consisting of—(C1-C12)-alkyl, —(C6-C20)-aryl, and —(C3-C12)-cycloalkyl,the R2 and R3 radicals are optionally bridged to one another, and optionally have a —(C6-C20)-aryl-(C6-C20)-aryl unit,wherein the alkyl, cycloalkyl and aryl groups mentioned are optionally substituted,and comprising a compound of the structure IIb: whereinR41, R42, R43, R44, R45, R51, R52, R53, R54, R55, R61, R62, R63, R64, R65 are each independently selected from the group consisting of—H, —O—(C1-C12)-alkyl, —O—(C6-C20)-aryl, —(C6-C20)-aryl, halogen, —COO—(C1-C12)-alkyl, —CO—(C1-C12)-alkyl, —CO—(C6-C20)-aryl, —COOH, and —OH. |
