Through Miscellaneous Reactions

Bis[methylgermyl] tellurium slowly eliminated methylgermanes at room temperature forming 1,3,5-trimethyl-2,4-ditellurapentagermane.  

This compound condensed further to form tris[methylgermyltelluro]methylgermane. Equimolar quantities of bis[trimethylsilyl] tellurium and disilyl tellurium at 20° were observed by NMR techniques to form the unsymmetrical species.  

Triethylgermyl triethylsilyltelluro mercury decomposed in hexane to triethylgermyl triethylsilyl tellurium.  

Irradiation of solutions of 2,2,3,3,5,5,6,6-octamethyl-l,4,2,3,5,6-ditelluratetrastanninane in deuterobenzene with light from a xenon lamp produced five-membered, tin-tellurium heterocycles. These compounds were not isolated. Their existence was proven by NMR spectroscopy . 

Trgolic Organo-tellurium Compounds without a C,Te-Bond 

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Miscellaneous Fused Systems. - 3,4-Diaminothiophens have been shown to be excellent starting materials for thienot3,4-b]pyrazines and thienot3,4-b]-1,4-diazepines through the reaction with 1,2-dicarbonyl compounds and 1,3-diketones, respectively. Pyridinot2, 3 ... 

Miscellaneous. Keten dimer has been used in the synthesis of a variety of pyrones (171) through its reaction with 2-hydroxy-4-quinolizinone. 

Miscellaneous Gold- and Iron-Catalyzed Cascade Reactions The car-benic reactivity of gold catalysis was exploited toward the synthesis of stereoselective six-membered ring carbocycles, through cyclopropanation reactions incorporated in cascade sequences [31]. 

Ruthenium clusters containing oxygenated diphosphine ligands Triruthenium and triosmium clusters obtained through orthometallation reactions Triruthenium complexes isolated during catalytic experiments Addition of phosphorus ligands to cationic triosmium complexes Miscellaneous oomplexes... 

Miscellaneous Reactions. Pantothenic acid has been coupled to a long chain amine with reagent K (eq 8). This is another example of the nonreactivity of hydroxyl groups with the enol ester intermediate. Attempts to prepare this amide through the mixed anhydride procedure give low yields. 

In Section 12.3 stereoselective reactions involving chiral NHCs have been classified in the same manner. Reactions that proceed through a number of these intermediates have been categorised according to the first asymmetric step in the transformation, with a miscellaneous section covering other reaction types. 

The effluent gas from the reactor contains about 50% maleic acid (not maleic anhydride). The balance is some. unreacted feed, CO2, water, and some miscellaneous waste products. A recycle stream is passed through a cooler and recharged to the reactor. The purpose is not only to take another pass at the feed but also to dilute the feed with some already-made maleic acid. That helps to disperse the heat of reaction and to control the operating conditions. 

Propargyl alcohols may be converted to allenes by several methods, for example, (a) through the intermediate formation of propargyl halides which are not isolated but react directly with cuprous salts and hydrogen halide [60, 72-73] or cyanide [71] (b) typical alcohol reactions with thionyl chloride [74a-d] phosphorus halides [75-77], and miscellaneous reagents (see Scheme 3). 

In the absence of catalyst, it occurs around 700 to 800< with once-through com er-sions of 20 to 30 per cent and overall yields not exceeding 50 to 60 molar per cent This low performance can be ascribed to the side reactions, especially hydrodealkylation to benzene and toluene, miscellaneous craddngs with the foimadon of coke or water gas, and the alkylation of the styrene formed to methylstyrene and the conversion of the by-products obtained. 

One other miscellaneous cycloaddition reaction has been reported. Arynes generated from anthranilic acids 205 have been found to undergo cycUzation with Barton esters 206 to afford polycycUc heterocydes 207 in moderate yields (Scheme 12.59) [109], with the reaction presumably proceeding through a radical pathway. 

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