Phosphorus oxide (P4O10) → Quinacridone

HRID 1603383Notes

Reaction equation

HRID 1603383 reaction equation
O=P12OP3(OP(OP(O3)(O1)=O)(=O)O2)=O.[NH:15]([C:22]1[CH:30]=[C:29]([C:31](O)=[O:32])[C:28]([NH:34][C:35]2[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=2)=[CH:27][C:23]=1[C:24](O)=[O:25])[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1>>[CH:38]1[CH:39]=[C:40]2[C:31]([C:29]3[C:28]([NH:34][C:35]2=[CH:36][CH:37]=1)=[CH:27][C:23]1[C:24]([C:21]2[C:16]([NH:15][C:22]=1[CH:30]=3)=[CH:17][CH:18]=[CH:19][CH:20]=2)=[O:25])=[O:32]

Participants

3

Reactant 2

HCID 14812Phosphorus oxide (P4O10)HCID 823512,5-Dianilinoterephthalic acid

Product 1

HCID 13976Quinacridone

Conditions

Temperature
85 °C

Procedure

424 parts of polyphosphoric acid, containing 85.0% P2O5, are introduced into a pressure vessel. Then 84.7 parts of 2,5-dianilinoterephthalic acid are introduced with stirring at from 80 to 90° C. and the mixture is heated at 125° C. for 1 hour during which ring closure takes place to form the quinacridone. The reaction mixture is then introduced into a second pressure vessel where it is hydrolyzed under pressure and with stirring with 1906 parts of 30.9% phosphoric acid at 140° C. During this hydrolysis the temperature rises to 155° C. The mixture is stirred at 155° C. for 0.5 hour. Then it is cooled to 60° C. and the pigment is filtered off with suction, washed to neutrality with water and dried at 80° C.

Workup

  1. additionare introduced into a pressure vessel
  2. temperaturethe mixture is heated at 125° C. for 1 hour during which ring closure

Sources & evidence

ORD record
ord-8d0be143209a438b8d99f5a093d45d4f
Source dataset
uspto-grants-1999_11
Patent number
US05989333

Reaction notes

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