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Dimethylbis(phenylethynyl)stannane (1) reacts with trialkylboranes, BR 3  (2), to give bis(alkenyl stannanes (5) (R = C 2 H 5 ), 1-bora-4-stanna-2,5-cyclohexadienes (6 ) (R = C 2 H 5 , C 3 H 7  i ), 1- stanna-2,4-cyclopentadienes (7) (R = C 2 H 5 ) and l-stanna-3-cyclopentenes (8 ) (R = CH 3 , C 2 H 5 ).  13 C and  119 Sn NMR data prove the structure of the reaction products (5 to 8 ).  119 Sn NMR is useful (i) for following the course of the reaction (mechanism!) and (ii) for quantitative analysis of the product distribution. Deorganoboration reactions play an important role in the formation of the various heterocyclic systems.

zeitschrift für naturforschung b

Organoborierung von Alkinylstannanen, XIV Organoborierung von Bis(alkinyl)stannanen: Mechanismus und Anwendung der  119 Sn–NMR-Spektroskopie/ Organoboration of Alkynylstannanes, XIV  Organoboration of Bis(alkynyl)stannanes: Mechanism and Application of  119 Sn NMR Spectroscopy