Mono complexes potassium

A versatile route to 3-benzoheteropines has been reported starting from o-phthalaldehyde, including the first preparations of 3-benzarsepines and the parent 3-benzothiepin and 3-benzoselenepins <96CC2183>. l,7-Dihydro-l//-dibenzo[c,c]tellurepin has been prepared from 2,2 -bis(bromomethyl)biphenyl and potassium tellurocyanate and its complexes with palladium and ruthenium species have been studied, a number of mono- and binuclear complexes are formed <96RTC427>. 

Chemical analysis revealed that commercial food grade copper chlorophyllin is not a single, pure compound, but is a complex mixture of structurally distinct porphyrins, chlorin, and non-chlorin compounds with variable numbers of mono-, di-, and tri- carboxylic acid that may be present as either sodium or potassium salts. Although the composition of different chlorophyllin mixtures may vary, two compounds are commonly found in commercial chlorophyllin mixtures trisodium Cu (II) chlorin Cg and disodium Cu (II) chlorin which differ in the number of... 

Further examples of a cyclic heterometallic potassium amide, obtained from KBu, MgBu2 and tmpH in CgH, or PhMe, are the isostructural complexes [(tmp)i2K6-Mg6(C6H5)6] (Figure 2.8) and [(tmp)i2K6Mg6(C6H4CH3)6] comprised of 24-membered N22K6Mg6 macrocycles that play host to six mono-deprotonated arene molecules... 

The synthesis and characterization of isolated, isomerically pure a2-[P2W17061(Mn+ L)]y- (Mn+ = Mn3 +, Fe3+, Co2+, Ni2+, and Cu2+) as aqueous-soluble potassium salts (L = HzO) and as the more novel, organic-solvent-soluble tetrabutylammonium salts (L = Br) are described herein. These preparations yield mono-metal-substituted complexes of the Dawson 2 isomer, 2-[P2Wi7O6i]10, that are typically >98% free of the (Xi isomer.1,2 The X-ray crystallographic structures of the a2-[P2W17O61]10 lacunary precursor and the a2-[P2W17061(Co" OH2)]8- complex are known.3... 

The uranium(III) complexes Cp2UI2(THF)3 and Cp UI2(py)3 have been structurally characterized [393b]. The similar tribromide complex Cp ThBr3(THF)3 [111] provides a convenient entry into the chemistry of mono(pentamethylcyclopentadienyl) derivatives of thorium. Aryloxide and alkyl derivatives may be readily prepared by treatment of Cp RhBr3(THF)3 with potassium aryloxide or alkyl Grignard reagents, respectively [373], for example (5.58)-(5.60) ... 

Hill expanded the range of bis(iminophosphorano)methanides with the lithium20 and potassium21 complexes 9 and 10. Complex 9 was prepared from the reaction of n-butyl lithium with the parent methane in ether and was crystallised as a mono-etherate which was found to not exhibit a lithium-methanide contact. The potassium complex 10 was prepared from the parent methane and potassium bis(trimethylsilyl)amide in toluene. A structural investigation revealed 10 to be a dimer formed by r 6-mesityl---potassium interactions, but a potassium-methanide contact was not observed. 

Summary Oligosilanes with trimethylsilyl groups react with one or two molar equivalents of potassium rcrr-butoxide in the presence of tetramethylethylenediamine (tmen) to yield quantitatively oligosilyl mono- and dianions (1, 2). Conversion of these compounds with Group 4 metal tetrachlorides leads to a novel type of Cp-free oligosilyl Group 4 metal chloride tmen complexes. 

The synthesis and characterization of a series of mono(pentamethylcyclopentadienyl)uranium(m) complexes has been explored. The uranium(m) triiodide precursor UI3(THF)4 reacts at ambient temperature with 1 equiv. of sodium or potassium pentamethylcyclopentadienide in THF to form the monocyclopentadienyl complex(m) Cp UI2(THF)3 (Scheme 32).84... 

It is possible to obtain an alkylidenecyclopropane, albeit in low yield, as the product of mono-dehydrochlorination from l,l-dichloro-3-ethyl-2,2-dimethylcyclopropane (11), in which the usual double dehydrochlorination is blocked (see Section 5.2.2.1.2.3.). Reaction with potassium /cr -butoxide gave a complex mixture of products, but in the early stages of the reaction a small amount of 2-chloro-3-ethylidene-l,l-dimethylcyclopropane (13) was detected. 

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