202803-69-8Relevant academic research and scientific papers
The first rigid O,C,O-pincer ligand and its application for the synthesis of penta- and hexacoordinate organotin(IV) compounds
Mehring, Michael,Schürmann, Markus,Jurkschat, Klaus
, p. 1227 - 1236 (2008/10/08)
The synthesis of the aryldiphosphonic ester C6H2[P(O)(OEt)2]2-1,3-t-Bu-5 (2) and of its organotin derivatives C6H2[P(O)(OEt)2] 2-2,6-t-Bu-4-RR′2Sn-1 (5, R = R′ = Me; 6, R = R′ = Ph; 7, R = Ph, R′ = Cl; 8, R = Ph, R′ = Br) is reported. Also reported is the preparation of the organosilicon and organotin compounds C6H2[P(O)(OEt)2]2-2,4-Me 3Si-1 (3), C6H2[P(O)(OEt)2]2-2,4-(Me 3Si)2-1,5 (4), C6H3tP(O)(OEt)2]2-2,4-Ph 2RSn-1 (9, R = Ph; 12, R = Br), and C6H3[P(O)(OEt)2]2-2,4-(Ph 2RSn)2-1,5 (10, R = Ph; 11, R = Br). X-ray investigations reveal weak intramolecular Sn-O interactions for 6 (2.865(3)-3.063(4) ?), 9 (2.803(3) ?), and 10 (2.793(2) ?) but strong Sn-O coordinations for 7 (2.203(5)72.278(6) ?) and 11 (2.379(3)/ 2.412(3) ?), indicating the high donor capacity of the new rigid O,C,O- and O,C-chelating ligands in these compounds. NMR studies confirm that the basic coordination geometry found in the solid state is maintained in solution. ? Dedicated to Prof. Manfred Weidenbruch on the occasion of his 60th birthday.
