The structural properties of soluble Poly (3, 3′-dioctyl-2, 2′-bithiophene)(PDOBT), a stereoregul... more The structural properties of soluble Poly (3, 3′-dioctyl-2, 2′-bithiophene)(PDOBT), a stereoregular analogous of Poly (3-octylthiophene)(POT), have been studied by X-ray diffraction and UV-VIS absorption spectroscopy. The absorption spectra have been ...
Synthesis of new geminal surfactants is described. The products contain multiple chains each cons... more Synthesis of new geminal surfactants is described. The products contain multiple chains each consisting of a hydrophobic C10-alkyl chain, further extended by hydrophilic ethyleneoxy-, EO-units, (-CH2CH2O-), which may be terminated by an alkyloxy sulfate, (-CH2CH2O-SO3Na), or -sulfonate group, (-CH2CH2CH2SO3Na). These chains are connected by EO-spacer groups. In this way was prepared non-ionic-, sulfate- and sulfonate surfactant molecules.
The structure of poly(octylthiophene)s and alternating octylthiophene‐thiophene‐copolymers with a... more The structure of poly(octylthiophene)s and alternating octylthiophene‐thiophene‐copolymers with a varying degree of intrachain regularity was studied by means of X‐ray diffraction and optical absorption measurements. Although these polymers show a varying degree of crystallinity, evidence is found that they all tend to pack as relatively straight parallel chains. The lateral packing distance depends strongly on the regularity and the relative amount of alkyl side chains. Generally poly(thiophene)s with a larger relative amount and higher stereoregularity of the octyl side chains tend to pack more ordered. On the other hand, a large conjugation length (high degree of chain planarity), as revealed by optical absorption spectroscopy, and a crystalline packing of the polymer chains are not found to be interdependent. For the polymer with highest degree of crystallinity two surprisingly different crystalline structures were found for the two versions with different regularity, viz. poly(...
Only the 4‐alkyl title compounds (I) rearrange thermolytically to the isomers (II), and only in c... more Only the 4‐alkyl title compounds (I) rearrange thermolytically to the isomers (II), and only in condensed phase.
Abstract Magnesium chlorochromate, MCC, oxidizes secondary alcohols to ketones in good yields. Pr... more Abstract Magnesium chlorochromate, MCC, oxidizes secondary alcohols to ketones in good yields. Primary alcohols gave aldehydes in low to moderate yields only, together with rearranged products.
Abstract Bromination in concentrated solutions of substituted thiophenes in acetic acid with NBS ... more Abstract Bromination in concentrated solutions of substituted thiophenes in acetic acid with NBS at room temperature was studied. Under the conditions, bromination readily took place with high regioselectivity at the 2-ring positions, > 99 %. The developed method was demonstrated to be suitable for multimolar preparations.
The structural properties of soluble Poly (3, 3′-dioctyl-2, 2′-bithiophene)(PDOBT), a stereoregul... more The structural properties of soluble Poly (3, 3′-dioctyl-2, 2′-bithiophene)(PDOBT), a stereoregular analogous of Poly (3-octylthiophene)(POT), have been studied by X-ray diffraction and UV-VIS absorption spectroscopy. The absorption spectra have been ...
Synthesis of new geminal surfactants is described. The products contain multiple chains each cons... more Synthesis of new geminal surfactants is described. The products contain multiple chains each consisting of a hydrophobic C10-alkyl chain, further extended by hydrophilic ethyleneoxy-, EO-units, (-CH2CH2O-), which may be terminated by an alkyloxy sulfate, (-CH2CH2O-SO3Na), or -sulfonate group, (-CH2CH2CH2SO3Na). These chains are connected by EO-spacer groups. In this way was prepared non-ionic-, sulfate- and sulfonate surfactant molecules.
The structure of poly(octylthiophene)s and alternating octylthiophene‐thiophene‐copolymers with a... more The structure of poly(octylthiophene)s and alternating octylthiophene‐thiophene‐copolymers with a varying degree of intrachain regularity was studied by means of X‐ray diffraction and optical absorption measurements. Although these polymers show a varying degree of crystallinity, evidence is found that they all tend to pack as relatively straight parallel chains. The lateral packing distance depends strongly on the regularity and the relative amount of alkyl side chains. Generally poly(thiophene)s with a larger relative amount and higher stereoregularity of the octyl side chains tend to pack more ordered. On the other hand, a large conjugation length (high degree of chain planarity), as revealed by optical absorption spectroscopy, and a crystalline packing of the polymer chains are not found to be interdependent. For the polymer with highest degree of crystallinity two surprisingly different crystalline structures were found for the two versions with different regularity, viz. poly(...
Only the 4‐alkyl title compounds (I) rearrange thermolytically to the isomers (II), and only in c... more Only the 4‐alkyl title compounds (I) rearrange thermolytically to the isomers (II), and only in condensed phase.
Abstract Magnesium chlorochromate, MCC, oxidizes secondary alcohols to ketones in good yields. Pr... more Abstract Magnesium chlorochromate, MCC, oxidizes secondary alcohols to ketones in good yields. Primary alcohols gave aldehydes in low to moderate yields only, together with rearranged products.
Abstract Bromination in concentrated solutions of substituted thiophenes in acetic acid with NBS ... more Abstract Bromination in concentrated solutions of substituted thiophenes in acetic acid with NBS at room temperature was studied. Under the conditions, bromination readily took place with high regioselectivity at the 2-ring positions, > 99 %. The developed method was demonstrated to be suitable for multimolar preparations.
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