| 1. |
- Foreman, Mark, 1973, et al.
(författare)
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The preparation of a solubilized form of Lawessons reagent and its thionation reactions
- 1999
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Ingår i: Heteroatom Chemistry. - 1098-1071 .- 1042-7163. ; 10:7, s. 651-657
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Tidskriftsartikel (refereegranskat)abstract
- 2-tert-Butylanisole and P4S10 react together to give 2,4-bis (3-tbutyl-4-methoxyphenyl) 1,3, 2, 4-dithiadiphosphetane 2, 4-disulfide (LR*) which was characterized by X-ray crystallography. Comparative thionation reactions of LR* and a range of P-S compounds were investigated. If was found that LR* in many cases, gives better yields of thionated complexes than Lawessons Reagent when the reactions are performed at room temperature. (C) 1999 John Wiley & Sons, Inc.
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| 2. |
- El-Sayed, I., et al.
(författare)
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Diels-Alder reactions of anthracenes with C-sulfonyldithioformates
- 2003
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Ingår i: Heteroatom Chemistry. - : Wiley. - 1042-7163 .- 1098-1071. ; 14:2, s. 170-174
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Tidskriftsartikel (refereegranskat)abstract
- C-Sulfonyldithioformates (2) (R-1 = ArSO2, R 2 = ArS) readily add to anthracene and 9-methylanthracene (1) in a Diels-Alder fashion with formation of 9,10-dihydro-10,9-(epithiomethano)anthracenes (3) which in turn may suffer thermally induced elimination of arenesulfinic acid to yield the 9-anthracenedithiocarboxylic esters (4). The reactions with the unsymmetrical diene 9-methylanthracene take place in a highly stereoselective fashion.
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| 3. |
- Stuhr-Hansen, Nicolai, et al.
(författare)
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Organoselenium-Substituted Poly(p-phenylenevinylene)
- 2005
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Ingår i: Heteroatom Chemistry. - : Wiley. - 1042-7163 .- 1098-1071. ; 16:7, s. 656-662
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Tidskriftsartikel (refereegranskat)abstract
- A new type of conjugated polymer, organoselenium substituted poly(p-pheylenevinylene) (PPV), was synthesized from the corresponding alkylselenenyl p-xylylene dibromide via a Gilch route using potassium tert-butoxide in THF. The p-xylylene dibromide precursors were synthesized by reacting lithiated bis(methoxymethyl)benzenes with elemental selenium, followed by alkylation of the generated selenolates. As a final demasking step, the bromomethyl functions were liberated by ether cleavage using boron tribromide. Bis-alkylselenenyl PPV was obtained with an average molecular weight Mw of approximately 300,000 g/mol and with polydispersity Mw/Mn=2. Due to low solubility, monoalkylselenenyl PPV was obtained with a considerably lower average molecular weight in the proximity of 16,000 g/mol and with a polydispersity slightly larger than 3. Absorption and flourescence spectroscopy revealed that the bis-alkylselenenyl PPV is extensively conjugated.
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| 4. |
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| 5. |
- SONNERBORG, A, et al.
(författare)
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Elevated levels of circulating tumor necrosis factor alpha in human immunodeficiency virus type 1-infected Africans living in Sweden
- 1995
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Ingår i: Clinical and diagnostic laboratory immunology. - : American Society for Microbiology. - 1071-412X .- 1098-6588. ; 2:1, s. 118-119
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Tidskriftsartikel (refereegranskat)abstract
- Elevated levels of tumor necrosis factor alpha in serum were found in human immunodeficiency virus type 1 (HIV-1)-infected Africans to a higher extent than in matched HIV-1-infected Caucasians, both groups living in Sweden. The results suggest that factors not related to the environment contribute to enhanced synthesis of tumor necrosis factor alpha in HIV-1-infected patients.
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