Identification and Quantification of Defect Structures in Poly(2,5-thienylene vinylene) Derivatives Prepared via the Dithiocarbamate Precursor Route by Means of NMR Spectroscopy on 13C-Labeled Polymers

A Simple and Efficient Synthesis of Fused Benzo[b]thiophene Derivatives

A new approach to the synthesis of fused benzothiophene derivatives was developed based on iodine-promoted photocyclization of 4,5-diaryl-substituted thiophenes obtained in three steps from commercially­ available compounds. Comparative analysis showed that photochemical cyclization is a more efficient method for the preparation of fused benzo[b]thiophene derivatives, compared to oxidative coupling of 4,5-diaryl-substituted thiophenes in the presence of iron(III) chloride and palladium-catalyzed intramolecular arylation. This new approach provides an efficient synthesis of functionally substituted naphtho[2,1-b:3,4-b′]dithiophenes, phenanthro[9,10-b]thiophenes, benzo[1,2-b:3,4-b′:6,5-b′′]trithiophenes, as well as new fused heterocycles containing a pyridine ring and/or a carbazole moiety.

Syntheses of 7-Substituted Anthra[2,3- b]thiophene Derivatives and Naphtho[2,3- b:6,7- b']dithiophene

7-R-Anthra[2,3- b]thiophene derivatives (1, R = H, Me, i-Pr, or MeO) are prepared in three steps (in average overall yield >50%) starting from ( E)-4-RC₆H₄CH₂(HOCH₂)C═CI(CH₂OH). The latter are commercial or readily prepared from 2-butyne-1,4-diol and ArCH₂Cl (both costing <1 cent/mmol) at 10 g scales. These allow for the selective formation of (otherwise unattainable) higher solubility 7-derivatives. Similar methods allow for the preparation of naphtho[2,3- b:6,7- b']dithiophene 2 using equally low-cost starting materials.

Transition-metal-free and halogen-free controlled synthesis of poly(3-alkylthienylene vinylene) via the Horner–Wadsworth–Emmons condensation reaction

Controlled polymerization without a transition metal or halogen.

A unique dithiocarbamate chemistry during design & synthesis of novel sperm-immobilizing agents

Unusual loss of CS₂ observed in benzyl substituted dithiocarbamates during synthesis of double edged spermicides which acted through sulfhydryl binding.

Synthesis of poly(p-phenylene vinylene) materials via the precursor routes

The precursor routes to obtain high-molecular weight poly(p-phenylene vinylene)s (PPVs) are reviewed with respect to their applicability towards specific synthesis goals and materials as well as their structural integrity.