About the activity and selectivity of less well-known metathesis catalysts during ADMET polymerizations

• Hatice Mutlu,
• Lucas Montero de Espinosa,
• Oĝuz Türünç and
• Michael A. R. Meier

Beilstein J. Org. Chem. 2010, 6, 1149–1158, doi:10.3762/bjoc.6.131

• [13][14][15][16][17]. In a number of other publications this problem was addressed and further discussions on the possible mechanism of the two proposed pathways, the π-allyl metal hydride and the metal hydride addition-elimination mechanisms, were reported [8][11][13][14][15][16][17][18]. In most

Redox-active tetrathiafulvalene and dithiolene compounds derived from allylic 1,4-diol rearrangement products of disubstituted 1,3-dithiole derivatives

• Filipe Vilela,
• Peter J. Skabara,
• Christopher R. Mason,
• Thomas D. J. Westgate,
• Asun Luquin,
• Simon J. Coles and
• Michael B. Hursthouse

Beilstein J. Org. Chem. 2010, 6, 1002–1014, doi:10.3762/bjoc.6.113

• . Purification of 26 was achieved by recrystallisation from CH2Cl2 and petroleum ether. Treatment of 26 with methoxide solution (generated in situ) resulted in sequential nucleophilic addition-elimination at the carbonyl carbon, generating the disodium dithiolate salt 24. The dianion was subsequently ring-closed

Mitomycins syntheses: a recent update

• Jean-Christophe Andrez

Beilstein J. Org. Chem. 2009, 5, No. 33, doi:10.3762/bjoc.5.33

• unnatural regioisomer 214 as the major product. Because carbon C2 in quinone 211 is more electrophilic than carbon C1, nucleophilic addition-elimination of vinylogous carbamate 212 at the carbon centre gave intermediate 213 which cyclized in situ to give compound 214. 7.3. Michael. Intramolecular Heck

Reduction of arenediazonium salts by tetrakis(dimethylamino)ethylene (TDAE): Efficient formation of products derived from aryl radicals

• Mohan Mahesh,
• John A. Murphy,
• Franck LeStrat and
• Hans Peter Wessel

Beilstein J. Org. Chem. 2009, 5, No. 1, doi:10.3762/bjoc.5.1

• radicals in the synthesis of indoles by a radical-based addition-elimination strategy [66][67]. However, our initial attempts in this area upon cyclization of arenediazonium salt 49a were not fruitful as the reactions afforded a mixture of the exocyclic alkene 50a and the alcohol 52a [Table 3, entry (i

• like a sulfide, sulfoxide or sulfone is necessary for the self-termination of the 5-exo-trig radical cyclization reactions to avoid competing intermolecular radical side-reactions. The TDAE-mediated radical-based addition-elimination route for the construction of indole ring systems warranted anhydrous

• based addition-elimination route to indoles. Cyclization of the arenediazonium salts 49b–d by TDAE. Reagents and conditions: (a) NOBF4, CH2Cl2, −10 °C to 0 °C, 1.5 h; (b) TDAE (1.5 equiv), anhydrous DMF, r.t., 10 min; (c) p-toluenesulfonic acid monohydrate, CH2Cl2, r.t., 12 h, 63% (51b, in three steps

Sordarin, an antifungal agent with a unique mode of action

• Huan Liang

Beilstein J. Org. Chem. 2008, 4, No. 31, doi:10.3762/bjoc.4.31

• , formation of an enol triflate using phenyl triflimide and installation of the isopropyl group by an addition-elimination sequence using a thienylcuprate reagent. Removal of the MOM groups and selective oxidation of the allylic alcohol by MnO2 led to the cycloaddition substrate 33, heating of which at 40 °C