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| 3. |
- Bremer, Kåre, et al.
(författare)
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An ordinal classification for the families of flowering plants
- 1998
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Ingår i: ANNALS OF THE MISSOURI BOTANICAL GARDEN. - : MISSOURI BOTANICAL GARDEN. - 0026-6493. ; 85:4, s. 531-553
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Recent cladistic analyses are revealing the phylogeny of flowering plants in increasing detail, and there is support for the monophyly of many major groups above the family level. With many elements of the major branching sequence of phylogeny established
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| 5. |
- Foreman, Mark, 1973, et al.
(författare)
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New organophosphorus-sulfur heterocycles
- 1997
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Ingår i: Journal of the Chemical Society-Dalton Transactions. - 0300-9246. ; :8, s. 1347-1350
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Tidskriftsartikel (refereegranskat)abstract
- The synthesis of 2,4-(naphthalene-1,8-diyl)-1,3,2,4-dithiadiphosphetane 2,4-disulfides from P4S10 and the appropriate naphthalene compound has been accomplished. The reactions of naphthalene-1,8-diyl-1,3,2,4-dithiadiphosphetane 2,4-disulfide with methanol and 3,5-di-tert-butylcatechol have been performed. The crystal structure of a naphthalene relative of Lawesson's reagent has been determined.
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| 6. |
- Foreman, Mark, 1973, et al.
(författare)
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Novel 1,2-thiaphosphetanes from diferrocenyldithiadiphosphetane disulfide
- 1997
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Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1364-548X .- 1359-7345. ; :9, s. 855-856
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Tidskriftsartikel (refereegranskat)abstract
- Diferrocenyldithiadiphosphetane disulfide reacts with bicyclic dienes to form four- and six-membered PS containing rings which are crystallographically characterised.
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| 7. |
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| 8. |
- Foreman, Mark, 1973, et al.
(författare)
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Reactions of dithiadiphosphetane disulfides with organonitrogen compounds
- 1999
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Ingår i: Journal of the Chemical Society-Dalton Transactions. - 0300-9246. ; :19, s. 3419-3430
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Tidskriftsartikel (refereegranskat)abstract
- The reactions of (RP)-P-1(S)S2P(S)R-1 (R-1 = ferrocenyl) with a range of organic systems containing unsaturated C-N linkages have been studied. Thus treatment with dimethylcyanamide gives a 1,3,5,4-thiazaphosphorine 4-sulfide, whereas reaction with dicarbodiimides gives a thiazadiphosphetane. Furthermore reaction of diphenylurea gives a phenylthiazaphosphetane. Mechanisms for the reactions are proposed and the crystal structures of three selected examples are reported and discussed with reference to the steric effects of the reactants. These reactions provide a new entry into C-P-S-N heterocycles. Cyclic voltammetry studies on a range of ferrocenyl substituted heterocycles were also made.
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| 9. |
- 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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| 10. |
- Foreman, Mark, 1973, et al.
(författare)
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The reaction of dithiadiphosphetane disulfides with dienes, alkenes and thioaldehydes
- 1999
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Ingår i: Journal of the Chemical Society-Dalton Transactions. - 0300-9246. ; :7, s. 1175-1184
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Tidskriftsartikel (refereegranskat)abstract
- Ferrocenyl dithiadiphosphetane disulfide behaves as RPS2 in simple cycloaddition reactions. Reactions with norbornadiene, norbornene and hexamethyl dewar benzene ail give rise to fused 4-membered C2PS ring compounds. Reaction with 2,3-dimethylbutadiene gave a simple Diels-Alder adduct which undergoes further reaction with BuLi and RX to yield FcP(S)(SR)(C6H9) (R = CH2Ph, o-MeC6H4CH2, 2,4-dinitrophenyl). A trithiaphosphorinane was obtained when Fc(2)P(2)S(4) was reacted with benzaldehyde or trimethylacetaldehyde. Reaction of Fc(2)P(2)S(4) with PhCH2N = CHPh gave a dithiophospholane and a thiazadiphosphetane disulfide. The new compounds have been characterised spectroscopically with illustrative examples having been studied by X-ray crystallography.
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