Toluene 2,4-Diisocyanate → Toluene 2,6-Diisocyanate

HRID 437326

Reaction equation

HRID 437326 reaction equation
C[C:2]1[C:3](=[CH:7][C:8](=[CH:12][CH:13]=1)[N:9]=[C:10]=[O:11])[N:4]=[C:5]=[O:6].[C:14]([O-])(=O)CCCCCCCCCCC.C([O-])(=O)CCCCCCCCCCC.C([Sn+2]CCCC)CCC>C(C(CCCC)CO)C>[CH3:14][C:7]1[C:3]([N:4]=[C:5]=[O:6])=[CH:2][CH:13]=[CH:12][C:8]=1[N:9]=[C:10]=[O:11]

Participants

4

Reactant 2

HCID 11443Toluene 2,4-DiisocyanateHCID 9809426Di-n-butyldilauryltin

Product 1

HCID 7040Toluene 2,6-Diisocyanate

Reagents, catalysts & solvents 1

HCID 77202-EthylhexanolCatalyst

Procedure

In another reactor, a fully blocked diurethane of 80/20 2,4/2,6-toluene diisocyanate mixture was prepared by slowly adding 87.1 parts of 80/20 toluene diisocyanate to 142 parts of 2-ethylhexanol containing 1 drop of dibutyl tin dilaurate with external cooling to maintain the reaction mixture below 100° C.

Workup

  1. temperaturewith external cooling
  2. temperatureto maintain the reaction mixture below 100° C.

Sources & evidence

ORD record
ord-a6666a6430cd41f49d614a849d2b6073
Source dataset
uspto-grants-1977_06
Patent number
US04031050

Linked notes

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