By Tse-Lok Ho

Fiesers' Reagents for natural Synthesis presents an up to date, A-to-Z directory of reagents pointed out in man made literature. Entries function concise descriptions, illustrations of chemical reactions, and chosen examples of purposes.

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2-diols. , Onomura,O.. Nat st (1) oH phr''t rffi v\? Ph Na2CO3 THF - H2O (50 : 1) Allylic displacernents. For achieri alkenols to form 2-vinylpiperidinc , VeCN)zPdClz is needed because tl: throughout the reaction. , Matsumura, Y. JOC 65,996 QUn). Bis(acetonitrile)(1,5-cyclooctadiene)rhodium(I) tetrafl uoroborate. Aryl transfen The aryl group of ArSnMej is transferred to N-sulfonyliminesr under the influence of the ionic Rh complex. fL4,9259 (1999'). Bis(acetonitrile)cyclopentadienyl(triorganophosphine)ruthenium(I) tetrafluoroborate.

Bis(allyl)dichlorodipalladium. AIIyIic displacements. [ microwa\os2 is rapid. + The reaction with 2-bromo-1,3-dienes to form allene products3 is more remarkable. a e^Me 80. l . A lesseramount MeO z- ^-\< . _o- *". FO MeO l((_roctl '):, d p b =r! 5 Alkylative cyclization. 2 [2 +2 +2]Cyclatinqiz substituted fulvenes. tl (22 : 1) The com' disilane is catalyzed by rhe F phosphine. This ligand acrrr: 87Yo donor. Coupling reactions. r0 The reaction conditions are compatible with a wide array of functional groups.

Foo o H O PhsH / cH2c12 en\{o PhS/ p-Methoxybenzyl t is valuable when orrd: 80% (syn : anti 92:8) had been reported pnr alone. ,in Rcocclr) are conand verted to the benzenethiomethylresidues using PhSH-PhSNa' Both substitution a,ct'ct-trichloroand chloroform However, hydrodechlorinationoccur on such treatment. toluenedo not reactin the samemanner. "ar,, 100o/o : B a a t i ,R . , G o u v e m e u r\. , Mitsudcn rRomero-Ortega,M.. , Kubota. K. K.. Na1al * Y u ,W . , S u , M . s A method for homologation of aldehydes accompanied by lithiated simultaneous introduction of an cr-PhS group involves reaction with the + (PhSH r-BuOK).

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