Download Acidic and Basic Reagents , Handbook of Reagents for Organic by Hans J. Reich, James H. Rigby PDF

By Hans J. Reich, James H. Rigby

Recognising the serious want for bringing a convenient reference paintings that bargains not just with the most well-liked reagents in synthesis to the laboratory of training natural chemists, the editors of the acclaimed 'Encyclopedia of Reagents for natural Synthesis' (EROS) have chosen an important and beneficial reagents hired in modern natural synthesis.

This booklet provides articles at the so much basic and flexible reagents for effecting natural ameliorations that have been initially incorporated in EROS. In deciding upon candidate entries for inclusion during this specific assortment, the editors followed a vast set of standards for outlining what precisely constitutes an acidic or simple reagent.

Each article comprises the entire details present in EROS in addition to multiplied similar reagents listings. extra new listings of lately released overview articles and monographs are integrated, in addition to suitable 'Organic Syntheses' approaches that care for both the arrangements or reactions of the featured reagents. This thorough and complete guide may have common attraction.

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Extra info for Acidic and Basic Reagents , Handbook of Reagents for Organic Synthesis

Sample text

Tang, P. C. JACS 1984, 106, 434. 10. Finger, C. S 1970, 541. 11. Bestmann, H. ; Frey, H. LA 1980, 2061. 12. S 1990, 931. 13. Pyne, S. ; Spellmeyer, D. ; Fuchs, P. L. JACS 1982, 104, 5728. 33) (chiral ligand and auxiliary1) Alternate Name: BINOL. Physical Data: mp 208-210°C; [a] 21 +34° (c= 1, THF). Solubility: sol toluene, CH2C12, EtNO2. Form Supplied in: white solid; widely available. 4 The best procedure uses (+)amphetamine as the chiral ligand and provides BINOL in 98% yield and 96% ee. Above 25 °C the CuII/(+)-amphetamine/(S)BINOL complex precipitates while the more soluble CuII/(+)amphetamine/(R)-BINOL complex is slowly transformed into the former complex.

7a-c In the presence of SbF5, this salt is able to react with three equivalents of pentafluorobenzene to yield perfluoro-l,3,5-triphenylbenzene (eq 3). 7a-c When 2,2'-di-H-octafluorobiphenyl is used as the sub­ strate, perfluorotriphenylene is obtained in 50% yield (eq 4). 7a-c The above reaction offers a facile ap­ proach for the preparation of these perfluorinated polynuclear aro­ matic compounds. 11 These cations are able to react with polyfluorinated arenes to form diaryl sulfides or selenides (eq 9).

7 N KOH, BINOL lost 20% of its rotation. (4) Crown Ethers. 7 Crown ethers containing 3,3'-disubstituted BINOL derivatives are particularly effective for asymmetric synthe­ sis. g. 18-Crown6) with Potassium Amide or Potassium t-Butoxide catalyze asymmetric Michael additions. 8 (5) (2) (3) Polymerization. 9 Thus optically active polymers are obtained with 80-90% isotacticity. 10 The chiral initiators selectively polymerize one enantiomer to give an optically ac­ tive polymer. The unreacted monomer is recovered with 92% ee at 67% conversion in the polymerization of methylthiirane with (S)-BINOL/Et2Zn.

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