Dimethylsulfoxide adducts with

The zinc and cadmium tellurolato complexes are air-sensitive polymeric solids14 which should be handled under inert gas. They are sparingly soluble in petroleum and chlorocarbons but readily dissolved by coordinating solvents (N,AT-dimethylformamide, dimethylsulfoxide, or pyridine). Zn(TeAr)2 forms a crystalline 1 2 adduct with 2-methyl-lH-imidazole, Zn(TeAr)2(imid)2. Heating solutions of Zn(TeAr)2 and Cd(TeAr)2 in mesitylene leads to formation of ZnTe and CdTe, respectively. H NMR Zn(TeAr)2 (DMSO-d6) <5 2.1 (s, 3H), 2.4 (s, 6H), 6.8 (s, 2H) Cd(TeAr)2 (pyridine-d5) 5 2.13 (s, 3H), 2.3 (s, 6H), 6.72 (s, 2H). 

Fig. 4. Lewis bases that form adducts with rare-earth tris / -diketonates. Abbreviations bipy = 2,2 -bipyridine phen = 1,10-phenanthroline terpy = 2,2, 6, 2"-terpyridyl bath = bathophenanthroline or 4,7-diphenyl-l,10-phe-nanthroline Hpbm = 2-(2-pyridyl)benziraidazole tppo = triphenylphosphine oxide tbpo = tri-n-butylphosphine oxide topo = tri-n-octylphosphine oxide tbp = tributylphosphate dmso = dimethylsulfoxide.

Diphenylmethane reacts with dioxygen in the presence of potassium 1,1-dimethylethoxide in various solvents (dimethylformamide [DMF], hexamethylphosphoramide [HMPA], pyridine) to produce nearly 100% yields of benzophenone [284]. The adduct of benzophenone with dimethylsulfoxide (DMSO) [l,l-diphenyl-2-(methylsulfinyl)ethanol] is formed as the final product of the reaction. The stoichiometry of the reaction and the initial rate depends on the solvent (conditions 300 K, [Ph2CH2] = 0.1mol L [Me3COK] = 0.2mol L 1,p02 = 97kPa). 

Best and Wege59have reported the first total synthesis of Mansonone F and this is described in Scheme 10. Phenol (111)60 was made to react with 2-chloroacetyl-5-methylfuran (112) in dimethylsulfoxide and sodium methoxide to yield (113). Ketalization of (113) followed by catalytic reduction and basic hydrolysis afforded anthranilic acid (114). Diazotization followed by pyrolysis with propene oxide in 1,2-dichloroethane probably yielded aryne (115), which undergoes intramolecular Diels-Alder reaction producing the adduct (116). Deoxygenation and then acid hydrolysis afforded the product (117). This was subjected to Grignard reaction. The resulting tertiary alcohol on nitration yielded the nitro compound (118) which was subjected to reduction and oxidation respectively to obtain (119). It yielded Mansonone F (120) on dehydration. 

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