Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
  • C07D495/22—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains four or more hetero rings

Definitions

• the disclosure generally relates to methods of making fused thiophene compounds.
• US Pat. 7,705,108 to He, M., et al, entitled "FUSED THIOPHENES, METHODS FOR MAKING FUSED THIOPHENES, AND USES THEREOF.”
• the disclosure provides improved methods of making fused thiophene (FT) compounds, and polymers thereof.
• FTx or like abbreviations can refer to a fused thiophene compound, polymerizable monomers thereof, and polymers thereof, where x is an integer indicating the number of fused thiophene ring or cycle units fused into a single core unit, for example, an FT2 has two fused rings in the core unit, an FT3 has three fused rings in the core unit, an FT4 has four fused rings in the core unit, an FT5 has five fused rings in the core unit, and like higher designations in the core unit.
• DCXFT4 or like abbreviations represent the class of symmetrical di-beta- substituted fused thiophene compounds where X is an integer representing the di-(R) substituent, which designates the number of carbon atoms in each R substituent or group attached to the core of a 3,7,10,14- tetrathiatetracyclo[6.6.0.0 2 ' 6 .0 9 ' 13 ]tetradeca- 1 (8),2(6),4,9( 13), 11 -pentaene.
• DC 10FT4 or like abbreviations represent the specific DCXFT4 compound: 3,7-Didecyl thieno[3,2-b]thieno[2',3':4,5]thieno[2,3-d]thiophene where the "10” represents the C 10 di-decyl substituents attached to the core (see J. Org. Chem., 2007, 72, 442-451), or (IUPAC) 5, 12-didecyl-3,7,10, 14- tetrathiatetracyclo[6.6.0.0 2 ' 6 .0 9 ' 13 ]tetradeca- 1 (8),2(6),4,9(13), 11 -pentaene.
• DC17FT4 or like abbreviations represent a specific DCXFT4 compound: 3,7-diheptadecyl thieno[3,2-b]thieno[2',3':4,5]thieno[2,3-d]thiophene, where the "17” represents each of the C 17 heptadecyl substituents attached to the core (see J. Org. Chem. ibid.
• DC21FT4 or like abbreviations represent a specific DCXFT4 compound: 3,7-di-heneicosyl thieno[3,2-b]thieno[2',3':4,5]thieno[2,3-d]thiophene where the "21” represents the C 21 di-heneicosyl substituents attached to the core (see J. Org. Chem. ibid), or (IUPAC) 5, 12-dihencosyl-3,7,10, 14- tetrathiatetracyclo[6.6.0.0 2 ' 6 .0 9 ' 13 ]tetradeca- 1 (8),2(6),4,9(13), 11 -pentaene.
• Hydrocarbon generally refer to monovalent, such as -R, or divalent -R- moieties, and can include, for example, alkyl hydrocarbons, aromatic or aryl hydrocarbons, alkyl substituted aryl hydrocarbons, alkoxy substituted aryl hydrocarbons, heteroalkyl hydrocarbons, hetero aromatic or heteroaryl hydrocarbons, alkyl substituted heteroaryl hydrocarbons, alkoxy substituted heteroaryl hydrocarbons, and like hydrocarbon moieties, and as illustrated herein.
• Alkyl includes linear alkyls, branched alkyls, and cycloalkyls.
• a hydroxy substituted alkyl can be a 2-hydroxy substituted propylene of the formula -CH 2 -CH(OH)-CH 2 -, an alkoxy substituted alkyl, can be a 2-methoxy substituted ethyl of the formula -CH 2 -CH 2 -0-CH 3 , an amino substituted alkyl, can be a 1-dialkylamino substituted ethyl of the formula -CH(NR 2 )-CH 3 , an oligo- (oxyalkylene), poly-(oxyalkylene), or poly-(alkylene oxide) substituted alkyl, can be, for example, of the partial formula -(R-0) x -, where x can be, for example, from 1 to about 50, and from 1 to about 20, and like substituted oxyalkylene substituents, such as of the formula -(CR 5 -CHR 5 -0) x - where R 5 is hydrogen or a substituted or unsubstit
• Aryl includes a mono- or divalent- phenyl radical or an ortho-fused bicyclic carbocyclic radical having about nine to twenty ring atoms in which at least one ring is aromatic.
• Aryl (Ar) can include substituted aryls, such as a phenyl radical having from 1 to 5 substituents, for example, alkyl, alkoxy, halo, and like substituents.
• Het includes a four-(4), five-(5), six-(6), or seven-(7) membered saturated or unsaturated heterocyclic ring having 1, 2, 3, or 4 heteroatoms selected from the group consisting of oxy, thio, sulfinyl, sulfonyl, selenium, tellurium, and nitrogen, which ring is optionally fused to a benzene ring.
• Het also includes "heteroaryl,” which encompasses a radical attached via a ring carbon of a monocyclic aromatic ring containing five or six ring atoms consisting of carbon and 1, 2, 3, or 4 heteroatoms each selected from the group consisting of non-peroxide oxy, thio, and N(X) wherein X is absent or is H, O, (Ci-4)alkyl, phenyl, or benzyl, and a radical of an ortho-fused bicyclic heterocycle of about eight to ten ring atoms derived therefrom, particularly a benzo -derivative or one derived by fusing a propylene, trimethylene, or tetramethylene diradical thereto.
• heteroaryl encompasses a radical attached via a ring carbon of a monocyclic aromatic ring containing five or six ring atoms consisting of carbon and 1, 2, 3, or 4 heteroatoms each selected from the group consisting of non-peroxide oxy, thio
• halo or halide includes fluoro, chloro, bromo, or iodo.
• Alkyl, alkoxy, etc. include both straight and branched groups; but reference to an individual radical such as "propyl” embraces only the straight chain radical, a branched chain isomer such as "isopropyl” being specifically referred to.
• the carbon atom content of various hydrocarbon-containing (i.e., hydrocarbyl) moieties can alternatively be indicated by a prefix designating a lower and upper number of carbon atoms in the moiety, i.e., the prefix _ j indicates a moiety of the integer "i" to the integer "j" carbon atoms, inclusive.
• a prefix designating a lower and upper number of carbon atoms in the moiety i.e., the prefix _ j indicates a moiety of the integer "i" to the integer "j" carbon atoms, inclusive.
• (Ci- C 8 )alkyl or Ci_ 8 alkyl refers to an alkyl of one to eight carbon atoms, inclusive
• hydro carbyloxy such as (Ci-C 8 )alkoxy or Ci_ 8 alkoxy refers to an alkoxy radical (-OR) having an alkyl group of one to eight carbon atoms, inclusive.
• Ci_ 8 alkyl can be, for example, methyl, ethyl, propyl, isopropyl, butyl, iso-butyl, sec-butyl, tert-butyl, pentyl, 3-pentyl, hexyl, heptyl, or octyl;
• C 3 _ i 2 )cycloalkyl can be cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, including bicyclic, tricyclic, or multi-cyclic substituents, and like substituents.
• a specific "hydrocarbyl” can be, for example, (Ci_ 2 4)hydrocarbyl, including all intermediate chain lengths and values.
• Ci_ 8 alkoxy can be, for example, methoxy, ethoxy, propoxy, isopropoxy, butoxy, iso-butoxy, sec-butoxy, pentoxy, 3-pentoxy, hexyloxy, 1-methylhexyloxy, heptyloxy, octyloxy, and like substituents.
• Aryl (Ar) can be, for example, phenyl, naphthyl, anthracenyl, phenanthrenyl, fluorenyl, tetrahydronaphthyl, or indanyl.
• Het can be, for example, pyrrolidinyl, piperidinyl, morpholinyl, thiomorpholinyl, or heteroaryl.
• Heteroaryl can be, for example, furyl, imidazolyl, triazolyl, triazinyl, oxazoyl, isoxazoyl, thiazolyl, isothiazoyl, pyrazolyl, pyrrolyl, pyrazinyl, tetrazolyl, pyridyl, (or its N-oxide), thienyl, pyrimidinyl (or its N- oxide), indolyl, isoquinolyl (or its N-oxide) or quinolyl (or its N-oxide).
• a specific value for Het includes a five-(5), six-(6), or seven-(7) membered saturated or unsaturated ring containing 1, 2, 3, or 4 heteroatoms, for example, non- peroxide oxy, thio, sulfinyl, sulfonyl, selenium, tellurium, and nitrogen; and a radical of an ortho-fused bicyclic heterocycle of about eight to twelve ring atoms derived therefrom, particularly a benzo -derivative or one derived by fusing a propylene, trimethylene, tetramethylene, or another monocyclic Het diradical thereto.
• the starting materials employed in the preparative methods described herein are, for example, commercially available, have been reported in the scientific literature, or can be prepared from readily available starting materials using procedures known in the field. It may be desirable to optionally use a protecting group during all or portions of the above described or alternative preparative procedures. Such protecting groups and methods for their introduction and removal are known in the art. See Greene, T. W.; Wutz, P. G. M. "Protecting Groups In Organic Synthesis," 2 nd ed., 1991, New York, John Wiley & Sons, Inc.
• “Monomer,” “mer,” or like terms refer to a compound that can be (or has already been) covalently combined or linked with other monomers of like or different structure to form homogenous (homopolymers) or heterogenous (e.g., copolymers, terpolymers, and like heteropolymers) chains of the target polymer.
• Suitable monomers as disclosed and illustrated herein can include, for example, low molecular weight polymerizable compounds, such as from about 50 to about 200 Daltons, and higher molecular weight compounds, such as from about 200 to about 10,000 Daltons, including unsaturated oligomeric or unsaturated polymeric compounds.
• Consisting essentially of in embodiments refers, for example, to a compound, to a polymer or a copolymer composition derived from the monomer compound, to a method of making or using the compound, the polymer, a formulation, or a composition, and articles, devices, or any apparatus of the disclosure, and can include the components or steps listed in the claim, plus other components or steps that do not materially affect the basic and novel properties of the compositions, articles, apparatus, or methods of making and use of the disclosure, such as particular reactants, particular additives or ingredients, a particular agent, a particular surface modifier or condition, or like structure, material, or process variable selected.
• Items that may materially affect the basic properties of the components or steps of the disclosure or that may impart undesirable characteristics to the present disclosure include, for example, no or very low monomer solubility, extensive or protracted purification processing because of poor solubility, unnecessary exposure of the resulting polymer to excessively high temperatures, and like contrary steps.
• compositions, devices, apparatus, and methods of the disclosure can include any value or any combination of the values, specific values, more specific values, and preferred values described herein.
• Highly conjugated organic materials such as monomer or polymer compositions of the present disclosure, are being developed for use in a variety of applications, including for example field effect transistors (FETs), thin- film transistors (TFTs), organic light-emitting diodes (OLEDs), electro-optic (EO) applications, as conductive materials, as two photon mixing materials, as organic semiconductors, and as non-linear optical (NLO) materials.
• FETs field effect transistors
• TFTs thin- film transistors
• OLEDs organic light-emitting diodes
• EO electro-optic
• Highly conjugated organic materials can be used, for example, in devices such as RFID tags, an electroluminescent device, such as used in a flat panel display, a photovoltaic, a sensor, and like devices, or a combination thereof.
• the disclosure provides a method for making a ⁇ ''-di-R- substituted fused thiophene compound.
• the disclosure provides a method for making a
• symmetrical or unsymmetrical di-P"-R-substituted fused thiophene compound including, for example:
• R 1 is independently a substituted or unsubstituted, branched or unbranched, Ci to C 6 hydrocarbylene
• a specific example of the a"-carboxy-P"-R- substituted fused thiophene of the formula (III) is the dicarboethoxy compounds where each R 1 is ethoxy or like protecting groups, such as -Me, -propyl, -Bu, i-Bu, -t-Bu, and like groups;
• R is independently a substituted or unsubstituted, branched or unbranched, C 4 to C 25 hydrocarbylene.
• the R can be, for example, a substituted or unsubstituted hydrocarbylene having from 4 to 25 carbon atoms, having from 8 to 22 carbon atoms, having from 10 to 21 carbon atoms, and like R substituents, including intermediate values and ranges.
• R can be, for example, -C 10 H 21 , -CnH 35i or -C 2 iH 43 .
• the di-acylation can be accomplished, for example, with at least two equivalents of an alkyl acyl halide, or like synthon, including a slight excess of the reactant.
• the alkyl acyl halide can be, for example,
• the contacting for the in situ bis-ring formation can be accomplished, for example, with at least two equivalents of 2-mercapto ethyl acetate.
• the decarboxylation of the diacid (IV) can be accomplished, for example, with a heated mixture of cuprous oxide in a suitable glycol ether solvent, or like solvent. In a specific example, the
• decarboxylation of the diacid (IV) was accomplished by heating a mixture of Cu 2 0 in tetraethyleneglycol dimethylether at about 220 to 240 °C.
• the ⁇ ''-di-R- substituted fused thiophene (V) compound prepared was 3,7-diheneicosyl thieno[3,2-b]thieno[2',3 * :4,5]thieno[2,3-d]thiophene (DC21FT4).
• the ⁇ ''-di-R- substituted fused thiophene compounds disclosed and prepared include all
• the disclosure provides an improved route to preparing DCXFT4 and like compounds based on experimentally demonstrated preparation of DC17FT4, DC10FT4, and DC21FT4.
• the disclosed process also eliminates, for example, a diol to diketone oxidation. Instead, the reaction of tetrabromothienothiophene and an acid chloride directly gives a diketone product.
• the disclosed process also includes an improved decarboxylation to provide a DCXFT4 core in the final step (see Shchekotikhin, A. E., et al, Chem Heterocycl Comp. 2007, 43, 439).
• the disclosed process provides a DC17FT4 product by, for example, the steps of: diketone formation (e.g., 44% yield), cyclization to construct the four fused rings (e.g., 84% yield), hydrolysis of the diester to the diacid (96% yield), and decarboxylation (e.g., 85% yield), in an overall yield of about 30%. Further yield improvements are being developed, especially for the diketone formation step.
• Particularly useful aspects of the disclosed method compared to a prior art method can be, for example, shorter synthetic route (four steps compared to at least six or more), a higher overall yield of about 30% versus about 18%.
• Each intermediate (diketone, diester, and diacid) has been obtained in a higher crude yield when compared with the prior method. This in turn provides simpler purification and decreased process time and cost.
• the disclosed preparative method also avoids the use of a chromium oxidizing reagent and a quinoline solvent used in the prior method.
• a synthesis of DC17FT4 from the straight chain C 18 alcohol and tetrabromothienothiophene has been previously disclosed ("prior process"), see commonly owned and assigned, US Pat. 7,705, 108 (ibid), and as illustrated in Scheme 1.
• the prior process gave DC17FT4 in about a 17.6% overall yield.
• shortcomings of the prior process can include, for example: an environmentally unfriendly chromium reagent was used in two steps of the process (see Gavin, I. M., et al, Environ Mol Mutagen. 2007, 48, 650). Quinoline was used in the decarboxylation reaction, which is difficult to remove and can potentially contaminate the product with decomposition products (see Shindo, H., et al, Heterocycles, 1989, 29, 899; Frey, J., et al, Org. Synth., 2006, 83, 209).
• the decarboxylation step also used high temperatures (270-300°C). This prior procedure gave lower overall yields of, for example, from about 15 to about 20 percent.
• the presently disclosed improved procedure provides a process which avoids or mitigates the aforementioned shortcomings.
• the disclosure provides an improved process for preparing DCXFT4 as illustrated in Scheme 2.
• DCXFT4 compounds prepared include, for example:
• R substituents are, respectively: -C 10 H 21 , -CnH ⁇ and -C21H43.
• R substituents are -C 10 H 21
• this compound can be named: 3,7-didecyl thieno[3,2- b]thieno[2 * ,3 * :4,5]thieno[2,3-d]thiophene or 5,12-didecyl-3,7,10,14- tetrathiatetracyclo[6.6.0.0 2 ' 6 .0 9 ' 13 ]tetradeca- 1(8),2(6),4,9(13),11-pentaene.
• this compound can be named: 3,7-diheptadecyl thieno[3,2- b]thieno[2',3':4,5]thieno[2,3-d]thiophene or 5,12-diheptadecyl-3,7,10,14- tetrathiatetracyclo[6.6.0.0 2 ' 6 .0 9 ' 13 ]tetradeca- 1 (8),2(6),4,9(13), 11-pentaene.
• this compound can be named: 3,7-diheneicosyl thieno[3,2- b]thieno[2',3':4,5]thieno[2,3-d]thiophene or 5,12-diheneicosyl
• the disclosure provides a device including at least one of the disclosed monomer compounds, or a polymer thereof.
• the device including, for example, a photovoltaic, an electroluminescent display, a sensor, a transistors, a semiconductor, an RFID tag, a light-emitting diode, or a combination thereof.
• the disclosure provides a preparative processes for an FTx compound to FT(x+2) ring system extension and beta-di-substituent elaboration, for example, an FT2 compound to an FT4 ring system extension and beta-di-substituent elaboration.
• the disclosed preparative process can be readily applied to, for example, analogous systems, such as an FT3 compound to FT5 ring system extension and beta- di-substituent elaboration, an FT4 compound to FT6 ring system extension and beta-di- substituent elaboration, and like extension applications.
• the analogous ring system extended compounds can also be selected for further substituent derivatization or polymerization. Examples
• Step A A suspension of 2,3,5,6- tetrabromothieno[3,2,b]thiophene (9.1 g, 0.2 mol) in anhydrous THF (500 mL) was cooled to -78 °C. Phenyl lithium solution in n-butyl ether (1.8 mol/L, 24 mL, 2.16 eq.) was added drop wise and the reaction mixture was stirred at -78°C. After lhr, an aliquot was removed and quenched, then tested by GC-MS. This test revealed that the di-anion was formed in 100% yield.
• Step B The l- ⁇ 3,6-dibromo-5-octadecanoylthieno[3,2- b]thiophen-2-yl ⁇ octadecan-l-one (30.0 g, 36 mmol) product of Example 1 was mixed with K 2 CC"3 (50 g, 360 mmol) and N,N-dimethylformamide (100 mL). The mixture was heated to 60 °C and ethyl 2-mercaptoacetate (8.8 mL, 79 mmol) was added dropwise. The reaction mixture was stirred for 48 hours at 60 °C under nitrogen, then was poured into ice water (500 mL).
• Step C The 2,6-dicarboethoxy- 3,7- diheptadecylthieno[3,2-b]thieno[2',3':4,5]thieno[2,3-d]thiophene (26.0 g, 30 mmol) product of Example 2, LiOH (2.9 g, 121 mmol in 29 mL water), THF (100 mL), MeOH (20 mL) and a catalytic amount (about 35 mg) of tetrabutylammonium bromide were combined in a round bottomed flask fitted with a condenser and heated at reflux overnight.
• Step D A mixture of the 3,7-diheptadecanyl thieno[3,2-b]thieno[2',3':4,5]thieno[2,3-d]thiophene-2,6-dicarboxylic acid (29 g, 35.5 mmol) product of Example 3, Cu 2 0 (1.16 g, 0.2 eq.) and glycine (1.16 g, 0.3 eq.) in tetraethyleneglycol dimethylether (600 mL) was heated to about 220 to 230 °C in a flask fitted with an outlet bubbler to monitor gas evolution. As the decarboxylation proceeded the evolved gas was monitored periodically.
• Step A A suspension of (2,3,5,6- tetrabromothieno[3,2,b]thiophene (10 g, 21.9 mmol) in anhydrous THF (200 mL) was cooled to -78 °C. Phenyl lithium solution in n-butyl ether (1.8 mol/L, 25 mL, 45 mmol) was added dropwise and the reaction mixture was stirred at -78°C for 4 h. Undecanoyl chloride (9.2 g, 44.9 mmol) was added to the reaction mixture via syringe while maintaining the temperature of the mixture as close to -78 °C as possible.
• the reaction was allowed to warm to RT over about three hours and then stirred overnight at RT.
• the reaction mixture was then quenched by the addition of crushed ice (200 g).
• the reaction mixture was stirred while the ice was allowed to melt.
• Most (greater than about 90%) of the THF was then removed under reduced pressure and the solid was filtered from the residual solution.
• the solid was suspended in water (100 mL) and stirred for lhr then filtered.
• Step B The l- ⁇ 3,6-dibromo-5-octadecanoylthieno[3,2- b]thiophen-2-yl ⁇ octadecan-l-one (6 g, 9.46 mmol) product of Example 5 was dissolved in N,N-dimethylformamide (150 mL) and stirring was started. Potassium carbonate (13.06 g, 94.6 mmol) was added at a rate such that the stirring was not disrupted followed by the addition of 18-crown-6 (10 mg). The mixture was heated to 80 °C and ethylthioglycolate (2.27 g, 18.91 mmol) was added dropwise.
• reaction mixture was stirred for 72 hours at 80 °C under nitrogen. Crushed ice (170 g) was added and the reaction mixture was allowed to stir for 1 hr. The solid was filtered from the solution the re-suspended in water (200 mL) and stirred for 1 hr. The suspension was filtered again and the solid re-suspended in methanol (200 mL) and stirred for another 1 hr.
• Step D A mixture of the 3,7-didecanyl thieno[3,2- b]thieno[2',3':4,5]thieno[2,3-d]thiophene-2,6-dicarboxylic acid (0.50 g, 0.8 mmol) product of Example 7, Cu 2 0 (10 mg, 0.07 mmol), and glycine (10 mg, 0.13 mmol) in tetraethyleneglycol dimethylether (40 mL) was heated to about 240 °C in a flask fitted with an outlet bubbler to monitor gas evolution. As the decarboxylation proceeded the evolved gas was periodically monitored.
• Step A A suspension of (2,3,5,6- tetrabromothieno[3,2,b]thiophene (20 mmol) in anhydrous THF (200 mL) is cooled to -78 °C. Phenyl lithium solution in n-butyl ether (41 mmol) is added dropwise and the reaction mixture is stirred at -78°C for 4 h. Docosanoyl chloride (41 mmol) is added to the reaction mixture via syringe while maintaining the temperature of the mixture as close to -78 °C. The reaction is allowed to warm to RT over about three hours and then stirred overnight at RT.
• reaction mixture is then quenched by the addition of crushed ice (200 g). The reaction mixture is stirred while the ice is allowed to melt. Most (>90%) of the THF is then removed under reduced pressure and the solid is filtered from the residual solution. The solid is suspended in water (100 mL) and stirred for lhr then filtered. The solid is re-suspended in methanol (100 mL), stirred for 1 hr then filtered to give the product l- ⁇ 3,6-dibromo-5-docosanoylthieno[3,2- b]thiophen-2-yl ⁇ docosan-l-one.
• 1H NMR (CD 2 C1 2 ) ⁇ 0.95 - 1.15 (6H, m), 1.30 - 1.82 (76H, m) and 3.17 - 3.32 (4H, m).
• Step B The l- ⁇ 3,6-dibromo-5-docosanoylthieno[3,2- b]thiophen-2-yl ⁇ docosan-l-one (10 mmol) product of Example 9 is dissolved in N,N- dimethylformamide (150 mL) and stirring is started. Potassium carbonate (100 mmol) is added at a rate such that the stirring is not disrupted followed by the addition of 18- crown-6 (10 mg). The mixture is heated to 80 °C and ethylthioglycolate (20 mmol) is added dropwise. The reaction mixture is stirred for 72 hours at 80 °C under nitrogen.
• Step D A mixture of the 3,7-diheneicosyl thieno[3,2- b]thieno[2',3':4,5]thieno[2,3-d]thiophene-2,6-dicarboxylic acid (1.0 mmol) product of Example 11 , Cu 2 0 (0.10 mmol), and glycine (0.16 mmol) in tetraethyleneglycol dimethylether is heated to about 240 °C in a flask fitted with an outlet bubbler to monitor gas evolution. As the decarboxylation proceeds the evolved gas is periodically monitored. After about 1.5 fir no further gas is observed to evolve and after 2 hr total the reaction is terminated.
• the reaction mixture is then precipitated from a 500 mL mixture of 95:5 methanol:water.
• the precipitate is collected by filtration, dissolved in toluene, boiled with concentrated ammonia (3 x 60 mL), and boiled with ethylene diamine tetraacetic acid (0.05 M in water, 2 x 50 mL).
• the organic layer is precipitated from methanol (500 mL). Filtration and vacuum drying (70-80 °C) yields polymeric material.
• Tetrakis(triphenylphosphine)palladium(0) (0.09 g, 0.785 mmol) is added to this mixture.
• the mixture is heated to 125 -130 °C under nitrogen for 16 hrs.
• the mixture is poured into a methanol (400 mL) and concentrated hydrochloric acid (20 mL) solution and stirred overnight at room temperature.
• the precipitate is filtered and Soxhlet extracted with acetone and hexane for 24 fir each.
• the obtained polymer is then dissolved into chlorobenzene, filtered, and precipitated in methanol.
• the collected polymer is dried in vacuum.

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