- A Benzodiphosphaborolediide
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The first example of a diphosphaborolediide, the benzo-fused [C6H4P2BPh]2? (12?), is prepared from ortho-bis(phosphino)benzene (C6H4{PH2}) and dichlorophenylborane, via a sequential lithiation approach. The dilithio-salt can be obtained as an oligomeric THF solvate or discrete TMEDA adduct, both of which are fully characterized, including by X-ray diffraction. Alongside NICS calculations, data strongly suggest some aromaticity within 12?, which is further supported by preliminary coordination studies that demonstrate η5-coordination to a zerovalent molybdenum center, as observed crystallographically for the oligomeric [{Mo(CO)3(η5-1)}{μ-η1-Mo(CO)3(TMEDA)}2] ? [μ-Li(THF)][μ-Li(TMEDA)].
- Pearce, Kyle G.,Canham, Elinor P. F.,Nixon, John F.,Crossley, Ian R.
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supporting information
p. 16342 - 16346
(2021/10/12)
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- Preparation of mono- and di-arylphosphines
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Mono- and di-arylphosphines are prepared by reacting an aryl compound that has a leaving group attached to a carbon atom of the aromatic ring with phosphine in the presence of a Group VIII metal catalyst.
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- Synthesis of chiral hydroxyl phospholanes from D-mannitol and their use in asymmetric catalytic reactions
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Chiral hydroxyl monophosphane 3 [(2S,3S,4S,5S)-3,4-dihydroxy-2,5-dimethyl-1-phenylphospholane] and bisphospholanes 5a [1,2-bis[(2S,3S,4S,5S)-3,4-dihydroxy-2,5-dimethylphospholanyl]benzene] and 5b [1,2-bis[(2S,3S,4S,5S)-2,5-diethyl-3,4-dihydroxyphospholanyl]benzene] were synthesized from readily available D-mannitol in high yields. Strategies for protection and deprotection of OH-groups in the presence of phosphines have been explored. Rate acceleration in the Baylis - Hillman reaction was observed when a hydroxyl phosphine was used as the catalyst. Rhodium complexes with chiral bisphospholanes are highly enantioselective catalysts for the asymmetric hydrogenation of various kinds of functionalized olefins such as dehydroamino acid derivatives, itaconic acid derivatives, and enamides. An interesting feature of the hydroxyl phospholane system is that hydrogenation of some substrates can be carried out in water with >99% ee and 100% conversion (e.g., itaconic acid).
- Li, Wenge,Zhang, Zhaoguo,Xiao, Dengming,Zhang, Xumu
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p. 3489 - 3496
(2007/10/03)
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- Synthesis and Structures of Dilithium (1,2-Diphosphido)benzenes
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Treatment of the appropriate (1,2-diphosphino)benzenes C6H3(PHR)2-1,2-R'-4 (R'=Me or H; R=H, Ph or SiMe3) with LiBun and tmen in hexane afforded the dilithium diphosphides 2 (R'=H, R=Ph 1; R'=
- Hitchcock, Peter B.,Lappert, Michael F.,Leung, Wing-Por,Yin, Ping
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p. 3925 - 3932
(2007/10/02)
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- Synthesis of o-Phenylene-bis(dibromophosphane) - Reaction Products of o-Phenylene-bis(dichlorophosphane)
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o-Phenylene-bis(dibromophosphane) (1) is prepared by reaction of P,P,P',P'-tetrakis(dimethylamino)-o-phenylenediphosphane with hydrogen bromide in ether.The reaction of o-phenylene-bis(dichlorophosphane) (2) with CH3OH in ether yields o-phenylene-bis(phos
- Woerz, H.-J.,Quien, E.,Latscha, H. P.
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p. 1706 - 1710
(2007/10/02)
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- 1.3-BENZODIPHOSPHOLE, 1.2-BIS-DIMETHYLAMINOALKYLIDENPHOSPHINO-BENZEN
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The alkali phosphides of 1.2-bis-phosphinobenzene, and 1-alkyl-derivatives react with (Me2N)2COEt(1+)BF4(1-) to give the title compounds with dicoordinated phosphorus.The structure is proved by their nmr spectra.
- Issleib, K.,Leissring, E.,Meyer, H.
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p. 4475 - 4478
(2007/10/02)
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- A NOVEL SYNTHESIS OF 1,2-DIPHOSPSORYLBENZENES
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Synthesis of phosphorylchloroacetylenes, diphosphorylacetylenes and the Diels-Alder reactions of the latter to produce o-diphosphorylbenzenes are described.
- Kyba, Even P.,Rines, Steven P.,Owens, Philip W.,Chou, Shang-Shing P.
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p. 1875 - 1878
(2007/10/02)
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