PROCESS FOR SYNTHESIZING OLIGO/POLYTHIOPHENES BY A "ONE-POT" SYNTHESIS ROUTE
The present invention is based on a “one-pot synthesis process” for preparing thiophenes from thiophene monomers with two leaving groups under metal catalysis.
1 . Process for polymerizing 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 mixture which comprises the at least one thiophene derivative and the at least one catalyst is admixed with at least one metal and/or at least one organometallic compound.
2 . Process according to claim 1 , wherein the at least one thiophene derivative contains at least one leaving group selected from the group consisting of halogens, sulphates, sulphonates and diazo groups.
3 . Process according to claim 1 or 2 , characterized in that, wherein the leaving groups of the at least one thiophene derivative are identical.
4 . 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.
5 . Process according to claim 1 , wherein the mixture which comprises the at least one thiophene derivative and the at least one catalyst is admixed with at least one metal selected from the group consisting of zinc, magnesium, tin and boron.
6 . Process according to claim 4 , wherein the at least one metal is magnesium in the presence of at least one organohalide.
7 . Process according to claim 1 , wherein the at least one catalyst comprises nickel and/or palladium.
8 . 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 and/or 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 optionally are independently 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 (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 Cl, Br or I.
9 . 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 ) Br 2 ), bis(diphenylphosphino)propanenickel dichloride (Ni(dppp)Cl 2 ), bis(diphenylphosphino)ethanenickel dichloride Ni(dppe)Cl 2 and mixtures thereof.
10 . Process according to claim 1 , wherein said process is performed batchwise.
11 . Process according to claim 1 , wherein said process is performed continuously.
12 . Process according to claim 1 , wherein said process is performed at a temperature of ≧+20 to ≦+200° C.
13 . Process according to any claim 1 , wherein said process is performed at a pressure of ≧1-≦30 bar.
14 . Poly/oligothiophene prepared by the process of claim 1 .
15 . Oligothiophene according to claim 13 with a chain length of n≧2 to ≦20 monomer units.
16 . Oligothiophene according to claim 14 or 15 having a polydispersity index PDI of ≧1 to ≦3.
17 . Polythiophene according to claim 14 having a molecular weight of ≧1000 to ≦30 000.