Tricyclopentadienyllutetium tetrahydrofuranate reacts with triphenylmethylenephosphorane with the formation of tricyclopentadienyllutetium triphenylmethylenephosphorane. A lutetium-containing metallacycle, 1,1-diphenyl-3,3-dicyclopentadienyl-1-phospha-3-luteto-indane, is formed by the decomposition of dicyclopentadienyl(methyl)lutetium triphenylmethylenephosphorane, by the reaction of dicyclopentadienylchlorolutetium triphenylmethylenephosphorane with sodium hydride or by the reaction of dicyclopentadienyllutetium chloride with lithium triphenylphosphonium methylide, respectively. The 1H and 13C NMR spectra of the new compounds are discussed. 相似文献
Titled 1,2,5-thiadiazolometacyclophane 1 was prepared via thia[2.3]cyclophane 5 which was obtained by the reaction of di(bromomethyl) 2 with sodium sulfide under phase-transfer-catalyzed conditions. Cyclophane 1 gave the corresponding pyrene derivatives by the oxidative transannular reaction in the reaction with brominating reagent. Reduction of 1 with lithium aluminum hydride followed by acetylation with acetic anhydride gave a 4:l-mixture of cis- and trans-diamide 11 and 12 with a trace amount of cyclophane-ring-cleaved product 13 . On the other hand, 13 was obtained as a major product in the reduction with metal sodium and diisobutylaluminum hydride. 相似文献
Abstract Oligomerization of butadiene with the catalyst system of nickel(II)chloride, electron donor, and lithium aluminum hydride or sodium borohydride has been studied. Most oligomers obtained with this catalyst were linear, and dihydrogenated dimers, trimers, and tetramers. They were n-octa-1,6-diene, n-octa-1,7-diene, n-dodeca-1,6,10-triene, and n-hexadeca-1,6,10,14-tetraene, which were identified by means of infrared, nuclear magnetic resonance, and mass spectrometry. Yields of each oligomer were strongly affected by the nature of the electron donors used. The hydrogen required for the formation of the hydrooligomers was assumed to originate from the lithium aluminum hydride or sodium borohydride used as a reducing agent. A proposed mechanism for the hydrooligomerization is that butadiene is oligomerized on the nickel atom, and the produced oligoolefins, bonded to the nickel by two terminal π-allylic bonds, are dihydrogenated to linear hydrooligomers. 相似文献
3-Indolylphenyliodonium trifluoroacetate reacts with ammonium bromide and lithium chloride and bromide to give 3-haloindoles. The reaction with ammonium chloride and tetrabutylammonium chloride leads to a mixture of 2- and 3-chloroindoles. The same mixture of chloroindoles is also formed by the action of lithium chloride but in the presence of 15-crown-5 ether. The course of the reaction is explained by ambident reaction of the cation of the iodonium salt.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1494–1496, November, 1981. 相似文献
Like other derivatization techniques, hydride generation is a chemical reaction that produces side-reactions leading to analytical problems. Demethylation of dimethylarsinic acid was observed to be dependent upon the pH level of the hydride generation reaction mixture. If the reaction mixture was acidic, then in addition to (CH3)2AsH, the monomethyl arsenic hydride [(CH3)AsH2] could be detected. Demethylation and also the formation of an unidentified arsenic species were noted when trimethyl arsonic oxide was used as derivatization educt. All of these effects depend on the pH level of the hydride generation mixture. We observed significant levels of organometal(loid) species of elements such as Ge, As, Sn, Sb, Hg and Bi in blank hydride generation mixtures. The organometal(loid) contamination was irreproducible even during I day using a single solution of sodium borohydride in deionized water. We concluded that the organometal(loid) contamination arises directly from the derivatization agent, sodium borohydride, itself. Use of helium purging and various adsorptive materials to decontaminate the sodium borohydride solution prior to analysis did not result in a significant decrease in organometal(loid) contamination levels. Use of a palladium-cluster stabilised with 1,10-phenanthrolin as alternative hydride generation derivatization agent was not found to be suitable, since reaction yields were poor and transmethylation reactions were noted. 相似文献
N-Substituted dihydropyrimidines, 1, 3 , and 4 , easily afforded N,N′-disubstituted 2,4-diaminopentanes 2 in good yield by the ring opening reaction with sodium borohydride. The reaction with lithium aluminum hydride was also examined. 相似文献
The reaction of organolithium reagents with methyl-dialkylborinates in hydrocarbon solvents proceeds readily with precipitation of lithium methoxide and the formation of the corresponding mixed organoborane: Consequently, simple filtration of the reaction mixture gives the mixed organoborane in high yield and purity. Other dialkylborane derivatives, such as the chloride and the hydride, are less desirable as substrates, frequently resulting in isomerization of the new alkyl groups. 相似文献
2-Thia-7-aza-isotwistanes . The access to the 2-thia-7-aza-isotwistane system was achieved by water addition to the twistene 1 yielding the isotwistanol 2 , characterized also as its acetate 4 . Analogous D2O/D2SO4-treatment of the twistene 1 (→ 3 ) allowed to deduce the reaction pathway for the formation of 2 . The chloride 6 , obtained from 2 , on treatment with lithium aluminium hydride gave a mixture of unsubstituted isotwistane 8 and twistane 9 , whereas silver acetate treatment of 6 led to the isotwistyl acetate 4 and possibly only to traces of the corresponding twistyl acetate 7 . 相似文献
The lithium, sodium, and potassium salts of tris(3,5-dialkyl-2-hydroxyphenyl)methanes (tert-butyl, tert-pentyl, methyl) have been prepared by reaction of the triarylmethane with n-butyllithium, sodium hydride, and potassium hydride, respectively. These compounds are all hexanuclear aggregates composed of two triarylmethane units. Whereas the lithium salt is compact and cannot bind oxygen-donor solvent molecules, the sodium and potassium systems have vacant coordination sites that can interact with solvents. For the sodium compounds, the solvent can be subsequently removed, and the resulting coordinatively unsaturated compounds have been shown to selectively bind oxygen-donor substrates (ethers, aldehydes, and ketones) of suitable size and shape. The paper reports the synthesis and characterization of these novel compounds, including thirteen crystal structures of the salts and their adducts. 相似文献