NEW HYPERVALENT COMPOUNDS CONTAINING [2-(Me2NCH2)C6H4], [2-(Et2NCH2)C6H4] AND [2-{O(CH2)4NCH2}C6H4] GROUPS

Adina Rotar and Cristian Silvestru

“Babes-Bolyai” University, Faculty of Chemistry & Chemical 
Engineering, 11 Arany Janos St., RO-400028 Cluj-Napoca, Romania;
E-mail:  adinar@chem.ubbcluj.ro 

Organotin(IV) derivatives containing the phenyl groups with a pendant arm, i.e. [2-(Me2NCH2)C6H4], [2-(Et2NCH2)C6H4] and [2-{O(CH2)4NCH2}C6H4], were prepared by reacting SnCl4 with [2-(Me2NCH2)C6H4]Li, [2-(Et2NCH2)C6H4]Li and [2-{O(CH2)4NCH2}C6H4]Li in 1:1 and 1:2 molar ratio. Mixed organotin(IV) halides were obtained from BuSnCl3 or Me2SnCl2 and [2-{O(CH2)4NCH2}C6H4]Li. The solution behavior of [2-(Et2NCH2)C6H4]2SnCl2 (1), [2-{O(CH2)4NCH2}C6H4]2SnCl2 (2), [2-{O(CH2)4NCH2}C6H4]SnBuCl2 (3), [2-{O(CH2)4NCH2}C6H4]SnMe2Cl (4) was investigated by NMR (1H, 13C, 119Sn) spectroscopy and the solid state molecular structure was established by single-crystal X-ray diffraction. The [2-(Et2NCH2)C6H4]2SnCl2 (1) derivative exhibits a distorted octahedral arrangement around the tin atom due to strong intramolecular N→Sn interactions in trans to the Sn-halogen bonds. The chirality induced by the intramolecular N→Sn interactions is discussed. These compounds are useful starting materials for the synthesis of new organotin(IV) cyclic compounds.

[2-(Et2NCH2)C6H4]2SnCl2