Erratum

Ohne Zusammenfassung     

A nucleophilic reaction of a phosphaalkene: the methylation of mesityldiphenylmethylenephosphine

The reaction of the title compound ($\underset{?}{1}$) with methyl iodine gives the ylide $\underset{?}{3}$ and the phosphonium salt $\underset{?}{4}$. The intermediate formation of the phosphoniaalkene $\underset{?}{2}$ is postulated.     

Beiträge zur Entwicklung psychotroperStoffe, 2. Mitt.: Basisch substituierte Dibenzo-oxepin-, Dibenzo-thiepin- und Dibenzo-cycloocten-Derivate

Zusammenfassung Die Umsetzung von 6, 11-Dihydro-dibenzo[b e[oxepin- (Xa) und-thiepin-11-onen (Xb) bzw. von 5,6,7,12-Tetrahydro-dibenzo [a d]cycloocten-12-on (Xc) mit verschiedenen tert. Aminoalkylmagnesiumhalogeniden führt zu den entsprechenden Carbinolen (XIa–c), welche durch Wasserabspaltung die korrespondierenden tert. Aminoalkyliden-Verbindungen (V a–c) wird eine spezielle Für sek. Aminoalkyliden-Derivate (Va–c) wird eine spezielle Darstellungsvariante beschrieben. Strukturelle Zusammenhänge der Verbindungen vom Typ V a–c mit therapeutisch bekannten psychotropen Stoffen werden diskutiert.In der vorliegenden Fassung: am 30. Mai 1962.Mitt.:K. Stach undH. Spingler, Mh. Chem.93, 889 (1962).     

ChemInform Abstract: X2Y2 Isomers: Tuning Structure and Relative Stability Through Electronegativity Differences (X: H,Li, Na,F, Cl,Br, I; Y: O,S, Se,Te).

Density functional calculations on XYYX and X₂YY isomers of the X₂Y₂ species (X: H, Li, Na, F, Cl, Br, I; Y: O, S, Se, Te) show that the XYYX isomers are more stable than the X₂YY forms except for X = F and Y = S and Te, for which the F₂SS and F₂TeTe isomers are slightly more stable.     

Toward Transition-Metal-Templated Construction of Arylated B4 Chains by Dihydroborane Dehydrocoupling

The reactivity of a diruthenium tetrahydride complex towards three selected dihydroboranes was investigated. The use of [DurBH₂] (Dur=2,3,5,6-Me₄C₆H) and [(Me₃Si)₂NBH₂] led to the formation of bridging borylene complexes of the form [(Cp*RuH)₂BR] (Cp*=C₅Me₅; 1 a : R=Dur; 1 b : R=N(SiMe₃)₂) through oxidative addition of the B−H bonds with concomitant hydrogen liberation. Employing the more electron-deficient dihydroborane [3,5-(CF₃)₂-C₆H₃BH₂] led to the formation of an anionic complex bearing a tetraarylated chain of four boron atoms, namely Li(THF)₄[(Cp*Ru)₂B₄H₅(3,5-(CF₃)₂C₆H₃)₄] ( 4 ), through an unusual, incomplete threefold dehydrocoupling process. A comparative theoretical investigation of the bonding in a simplified model of 4 and the analogous complex nido-[1,2(Cp*Ru)₂(μ-H)B₄H₉] ( I ) indicates that there appear to be no classical σ-bonds between the boron atoms in complex I , whereas in the case of 4 the B₄ chain better resembles a network of three B−B σ bonds, the central bond being significantly weaker than the other two.