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NMR investigations on stannabicycloundecanes of the type RSn(CH2CH2CH2)3N

par Mügge, C.;Pepermans, Henri;Gielen, Marcel ;Willem, Rudolph ;Tzschach, Alfred;Jurkschat, K.
Référence Zeitschrift für anorganische und allgemeine Chemie (Online), 567, 1, page (122-130)
Publication Publié, 1988

Article révisé par les pairs

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Résumé :

The 1H, 13C, and 119Sn NMR data of seven stannabicycloundecanes of the type RSn(CH2CH2CH2)3N (1, R = Cl; 2, R = Br; 3, R = I; 4, R = OH; 5, R = SPh; 6, R = Me; 7, R = Sn(CH2CH2CH2)3N) are reported. From 1H NMR coalescence data at low temperature the free activation enthalpies for the racemisation of the bicyclo[3.3.3]skeleton were estimated to be 37 ± 1 kJ/mol. They are independent of the substituent R. However, it decreases when the tin atom is replaced by silicon for R = Me.