Darstellung und Struktur von Diphenyl‐zinn

Abstract

Bei der Reaktion niit Pyridin wird als aktive Zwischenstufe ein 2.4-Dinitrophenylester der Phosphorsluren (11) angenornmen. In Gcgenwart starker, tert. Basen wird ein chinoider

An External Magnetocatalytic Effect

“…437, 213 (1924). [2] While this work was in progress, a patent has appeared, describing the synthesis of (3), R=H, from sulfoacetic acid dichloride and hydrazobenzene without reporting the yield: R. Doson and V. Papesch, U.S.-Patent 3037027;Chem. Abstr.…”

“…252, 308 (1889). After chlorination or bromination of high-molecular, straightchain hydrocarbons with, for example, N-chloro-or Nbromosuccinimide, t-butyl hypochlorite or hypobromite [I] the isomeric chlorides of n-heptane, n-octane, n-decane and the isomeric bromides of n-heptane and n-octane were The changes in the concentration of DPNH with time were followed by spectrophotometry [l], and the catalytic activity was calculated in units per ml [2]. The reaction mixture comprised 3 mi of 0.05 M triethanolamine buffer (pH 8.0), 0.045 ml of 0.01 M DPNH, 0.03 ml of 0.26 M EDTA, 0.1 ml of 3 M ammonium acetate, and 0.03 ml of 10-7 M GIDH.…”

“…One unit is the amount of enzyme dissolved in 1 ml which alters the extinction at 366 mp (light path: 1 cm) by 0.100 within 100 sec at 25 'C. Catalytic condensation of dialkyltin dihydrides and diaryltin dihydrides gives rise to crystalline aliphatic [ I ] and aromatic [2] cyclostannanes containing five-, six-, or nine-membered rings. We have now succeeded in preparing an analogous compound with a four-membered ring, viz.…”

“…The ring size in the products formed depends not only on the cataIyst used, but also on the nature of the organic substituent on the tin (cf. [1,2]). Recently, the analogous octa-t-butyl compound was prepared by a different route as the first example of a cyclotetrastannane [3].…”

Preparation and stability of phenylated polysilanes

“…Other ele ments of Group IVb have a tendency toward catenation, and organic derivatives of polygermanes and polystannanes of chain lengths up to nine are known (12)(13)(14)(15). The tendency toward catenation decreases in going from silicon to lead, and no organic lead compounds are known with more than two lead atoms bound together in a chain (7).…”