Process for the preparation of poly- and oligothiophenes on an industrial scale
View Patent ↗Process for industrial scale synthesis of poly- and oligothiophenes, which works in concentrated solution. In this process, a solution which comprises an organometallic thiophene reagent is added to a second solution which comprises a catalyst.
1. Process for polymerization of at least one thiophene derivative having at least two leaving groups, the polymerization proceeding by means of an organometallic thiophene compound and of at least one catalyst, wherein a first solution which comprises the at least one organometallic thiophene compound is metered into a second solution which comprises the at least one catalyst, where the polymer concentration defined by the concentration of the two solutions (at 100% conversion) is ≧5% by weight.
2. Process according to claim 1 , wherein the concentration of the organometallic thiophene compound in the first solution is ≧6% by weight.
3. Process according to claim 1 , wherein the volume ratio in l/l of the first and of the second solution is ≧3:1 to ≦20:1.
4. Process according to claim 1 , wherein the metering time t within which the first solution is added fully to the second solution is
t
=
500
k
Min
m
⋆
V
reactor
A
reactor
m
3
m
2
where k is ≧0.2 to ≦5 and “V reactor ” is the volume, “A reactor ” the heat exchange surface, of the vessel in which the reaction takes place.
5. Process according to claim 1 , wherein the at least one thiophene derivative contains at least one leaving group selected from the group of halogens, sulphates, sulphonates and diazo groups.
6. Process according to claim 1 , wherein the leaving groups of the at least one thiophene derivative are identical.
7. Process according to claim 1 , wherein the organometallic thiophene compound contains at least one metal selected from the group consisting of zinc, magnesium, tin and boron.
8. Process according to claim 1 , wherein the at least one catalyst comprises nickel, palladium or both.
9. Process according to claim 1 , wherein the at least one thiophene derivative comprises at least one compound of the formula:
where R is selected from the group consisting of hydrogen, hydroxyl, halogen, pseudohalogen, formyl, carboxyl derivatives, carbonyl derivatives, alkyl, long-chain alkyl, alkoxy, long-chain alkoxy, cycloalkyl, haloalkyl, aryl, arylene, haloaryl, heteroaryl, heteroarylene, heterocycloalkylene, heterocycloalkyl, haloheteroaryl, alkenyl, haloalkenyl, alkynyl, haloalkynyl, keto, ketoaryl, haloketoaryl, ketoheteroaryl, ketoalkyl, haloketoalkyl, ketoalkenyl, haloketoalkenyl, phosphoalkyl, phosphonates, phosphates, phosphine, phosphine oxide, phosphoryl, phosphoaryl, sulphonyl, sulphoalkyl, sulphoarenyl, sulphonate, sulphate, sulphone, amine, polyether, silylalkyl and silylalkyloxy, where, in the case of suitable radicals, one or more nonadjacent CH 2 groups may independently be replaced by —O—, —S—, —NH—, —NR—, —SiRR—, —CO—, —COO—, —OCO—, —OCO—O—, —SO 2 —, —S—CO—, —CO—S—, —CY 1 ═CY 2 or —C≡C—, and in such a way that oxygen and/or sulphur atoms are not bonded directly to one another, wherein terminal CH 3 groups are interpreted as CH 2 groups in the sense of CH 2 —H and where X and X′ are each independently a leaving group.
10. Process according to claim 1 , wherein the at least one catalyst comprises at least one compound selected from the group consisting of nickel and palladium catalysts with ligands selected from the group consisting of tri-tert-butylphosphine, triadamantylphosphine, 1,3-bis(2,4,6-trimethylphenyl)imidazolidinium chloride, 1,3-bis(2,6-diisopropylphenyl)-imidazolidinium chloride or 1,3-diadamantylimidazolidinium chloride or mixtures thereof; bis(triphenylphosphino)palladium dichloride (Pd(PPh 3 )Cl 2 ), palladium(II) acetate (Pd(OAc) 2 ), tetrakis(triphenylphosphine)palladium (Pd(PPh 3 ) 4 ), tetrakis(triphenylphosphine)nickel (Ni(PPh 3 ) 4 ), nickel(II) acetylacetonate Ni(acac) 2 , dichloro(2,2′-bipyridine)nickel, dibromobis(triphenylphosphine)nickel (Ni(PPh 3 ) 2 Br 2 ) bis(diphenylphosphino)propanenickel dichloride (Ni(dppp)Cl 2 ) or bis(diphenylphosphino)ethanenickel dichloride Ni(dppe)Cl 2 and mixtures thereof.
11. Process according to claim 1 , wherein said polymerization is performed at ≧+20 to ≦+200° C.
12. Process according to claim 1 , wherein said polymerization is performed at ≧1−≦30 bar.
13. The process of claim 9 , wherein said leaving group is Cl, Br or I.
14. The process of claim 13 , wherein said leaving group is Br.