... 474 CHAPTER Polar Addition and Elimination Reactions Addition and elimination processes are the formal reverse of one another, and in some cases the reaction can occur ... Janousek, and H G Viehe, Tetrahedron, 53, 15717 (1997) Table 5.4 Regiochemistry of Some Sulfenylation Reactions with Sulfenyl Chlorides 500 CHAPTER Alkene Polar Addition and Elimination Reactions...
... called a hemiacetal, and you can think of it as “half-way” toward making an acetal: O RO RO OH hemiacetal OR acetal We give it a special name because it is theoretically possible to isolate it and ... case is PCC, and we have seen that PCC will convert a primary alcohol into an aldehyde: O OH PROBLEMS 2) DMS OH CrO3 5.3 Aqueous acetone heat Na2Cr2O7 5.4 H2SO4, H2O OH 1) O3 5.5 2) DM...
... base, bimolecular reactions (SN2 and E2) are favored E2 + MAJOR MINOR STRONG NUC STRONG BASE EXAMPLES: RO WEAK NUC E2 WEAK BASE + MAJOR , HO E2 SN2 SN2 SN2 MINOR For pr imary substrates, SN2 ... processes (SN2 and E2) 23 8 CHAPTER 10 ELIMINATION REACTIONS The fourth and final category contains reagents that are weak nucleophiles and weak bases These reagents include water (H2O) and alcohols ....
... 834 CHAPTER 10 Concerted Pericyclic Reactions pericyclic reactions. 4 These various approaches conclude that TSs with certain orbital ... structures with specific orbital alignments, the concerted pericyclic reactions often have characteristic and predictable stereochemistry In many cases, the reactions exhibit regioselectivity that can ... and stereochemistry and provide add...
... (1997) 986 H CHAPTER 11 H Y Free Radical Reactions Y Z = –CH Z CH2, CH O, C N The stereochemistry of reactions involving substituted alkenyl free radicals indicates that radicals formed at trigonal ... Free Radical Chemistry, W A Pryor, ed., Academic Press, New York, 1980, pp 355–380 E S Huyser, Free Radical Chain Reactions, Wiley-Interscience, New York, 1970, Chap 4; G A...
... (glycyram, GC, Fig 2) [7, 8, 11 14] GA and GC have solubilizing properties for a range of drugs [15 18] 30 30 HOOC 29 HOOC 20 20 12 O O O H O O 18 28 COO H 11 NH4 28 COOH O 18 11 12 OH OH HO HO COO COOH ... f-metal and ranges from 14 .32 to 14 . 01 (in the case of Nd(III) 14 . 01 and Yb(III) 14 .08 ; Fig .11 ) 23 Natalya Rusakova, Olga Snurnikova and Ninel Efryushina b Figure 11...
... during the reaction: O • OH – Ru(VII) + 2e → Ru(V) TBSO 78% H3C CH3 HCH3O OTBS H H O O O O H O TBSO 2Ru(V) → Ru(VI) + Ru(IV) Julia-Lythgoe Olefination Ru(VI) + 2e– → Ru(IV) Griffith, W P.; Ley, S V.; ... Aldehyde (Ketone) R-CHO (RCOR ') hemiketal (hemiacetal) Oppenauer Oxidation Chromium (VI) Oxidants Sodium Hypochlorite N-Bromosuccinimide (NBS) Bromine Cerium (IV) Oxidants R Pyridinium Di...