[CH3:1][C:2]1[CH:3]=[C:4]([C:10]([C:13]2[CH:18]=[C:17]([CH3:19])[C:16]([OH:20])=[C:15]([CH3:21])[CH:14]=2)([CH3:12])[CH3:11])[CH:5]=[C:6]([CH3:9])[C:7]=1[OH:8].[N:22]#[C:23]Cl.C([O-])([O-])=O.[Na+].[Na+]>O>[CH3:21][C:15]1[CH:14]=[C:13]([C:10]([C:4]2[CH:3]=[C:2]([CH3:1])[C:7]([O:8][C:23]#[N:22])=[C:6]([CH3:9])[CH:5]=2)([CH3:12])[CH3:11])[CH:18]=[C:17]([CH3:19])[C:16]=1[OH:20]28.4 g (0.1 mol) of 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane are suspended in 500 ml of water and 300 ml of dichloromethine. After cooling to 0° C, 15 ml (0.3 mol) of cyanogen chloride are added. 10.6 g (0.1 mol) of Na2CO3, dissolved in 50 ml of water, are then added dropwise over the course of 2 hours, with vigorous stirring, in such a way that a pH value of between 7.5 and 8.5 is maintained constantly in the reaction mixture. At the same time, the reaction temperature is kept at about 0° C by cooling. Thereafter, the reaction is terminated by slow addition of 1 N NaOH, the 1 N NaOH being added in such a way that a pH value of 7.5 to 8.0 is constantly maintained in the reaction mixture and persists as the final value. After the end of the reaction, the organic phase is separated off, washed with 50 ml of water and concentrated at room temperature. 30.8 g (99% of theory) of 2-(3,5-dimethyl-4-hydroxyphenyl)-2-(3,5-dimethyl-4-cyanatophenyl)-propane are obtained as the residue.
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