Synthesis of 5,5,6,6,21,21,22,22-octamethyl-5,6,21,22-tetragerma[10.10]paracyclophane
摘要:
A [10,10]paracyclophane, 5,5,6,6,21,21,22,22-octamethyl-5,6,21,22-tetragerma[10.10]paracyclophane (4a), with two (RRGeGeRR2)-R-1-Ge-2-R-1- moieties in the center of two bridges, was prepared. An attempt to synthesize cyclophanes, 4b (R-1 = Me; R-2 = Ph) and 4c (R-1 = R-2 = Ph) was also made. The products were not analytically pure even after strenuous purification procedure to indicate that a double Wurtz coupling reaction is extremely difficult and necessarily accompanied by formation of polymeric byproducts. (C) 2003 Elsevier B.V. All rights reserved.
Synthese de composes a liaison MIVBmercure. Precurseurs d'especes monovalentes (germynes), et bivalentes (germylenes), de radicaux centrometalles et d'intermediaires
作者:P. Riviere、A. Castel、J. Satge
DOI:10.1016/s0022-328x(00)85661-2
日期:1981.6
Polynuclear germylmercury compounds are obtained from the reaction of organohydrogermanes PhnGeH4−n or digermanes Ph2nGe2H4−n (n = 1, 2) with dialkylmercury R2Hg. Di- or tri-mercurated geminal polygermates thus synthesized generally present a low stability and undergo thermal- or photo-decompositions leading to the corresponding monovalent (germynes), divalent (germylenes) or, trivalent (germanium
多有机环锗烷基汞化合物是从有机氢锗酸Ph n GeH 4- n或二锗烷基Ph 2 n Ge 2 H 4- n(n = 1,2)与二烷基汞R 2 Hg的反应中获得的。如此合成的二或三聚汞的双聚锗酸酯通常表现出较低的稳定性,并且会发生热分解或光分解,从而导致相应的单价(锗烷),二价(亚锗烷)或三价(锗中心自由基)物种以及中间双自由基可以认为是锗双键化合物的极限形式。这样的中间体已经在化学和光谱学上表征。
Aoyagi Shigenobu, Tanaka Katsumi, Takeuchi Yoshito, J. Chem. Soc. Perkin Trans. 2, (1994) N 7, S 1549-1553