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Verbindungen des Germaniums und Zinns, 10 [1] Thermolyse eines Cyclotristannans: Stannylen‐ versus Distannen‐Reaktionen
Author(s) -
Weidenbruch Manfred,
Schäfer Annemarie,
Kilian Hartmut,
Pohl Siegfried,
Saak Wolfgang,
Marsmann Heinrich
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921250306
Subject(s) - chemistry , phenylacetylene , tin , toluene , germanium , bromide , derivative (finance) , chloride , thermal decomposition , nuclear magnetic resonance spectroscopy , phosphoryl chloride , medicinal chemistry , cleavage (geology) , stereochemistry , silicon , organic chemistry , catalysis , financial economics , economics , geotechnical engineering , fracture (geology) , engineering
Compounds of Germanium and Tin, 10 [1] . — Thermolysis of a Cyclotristannane: Stannylene versus Distannene Reactions Hexakis(2,4,6‐triisopropylphenyl)cyclotristannane ( 1 ), first described by Masamune and Sita, is easily accessible by treatment of tin(II) chloride with 2,4,6‐triisopropylphenylmagnesium bromide. The equilibrium between 1 and its cleavage products bis(2,4,6‐triisopropylphenyl)stannylene ( 2 ) and tetrakis(2,4,6‐triisopropylphenyl)distannene ( 3 ) in toluene has been followed by 119 Sn‐NMR spectroscopy at elevated temperatures. Stannylene 2 can be trapped by open‐chain or cyclic diketones as well as by 1,3‐dienes. Reaction of 3 with phenylacetylene proceeds in a [2 + 2] fashion to provide the 1,2‐distannacyclobutene derivative 5 whose structure was confirmed by X‐ray crystallography.
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