Houben-Weyl Methoden der organischen Chemie vol.E5 by Simchen G., et al. (eds.) PDF

By Simchen G., et al. (eds.)

ISBN-10: 3132175048

ISBN-13: 9783132175044

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Cryst. Mol. , 3, 285. 30 CHEMISTR Y OF TIN 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 1. C. (1980) J. Organornet. , 185, 199. , Wei, C. etal. (l987)J. Organornet. , 322, 163. , Pelizzi, C. and Pelizzi, G. (1977) J. Organornet. , 125, 161. , Chandrasekhar, V. et al. (1988) J. Am. Chern. , 110, 1168. , Bino, A. et a!. (1985) lnorg. , 24, 2301. O. R. (1981) J. Am. Chern. , 103,1264; (1981) lnorg. , 20, 3076. G. K. (1987) J. Organornet.

C. (1973) lnorg. , 12,930. distances in Sn(CF3)4 are lengthened by 6 pm compared with those in SnMe4 [144]. However, the tin atoms in compounds containing four tin-carbon bonds appear to be reluctant to form higher coordination numbers. Although the complex Me3SnCF3┬ĚP(NMe2)3 has been reported [145], tetraorganostannanes, R 4Sn, do not in general form donor-acceptor complexes with Lewis bases. Two five-coordinated examples, (22) [146] and (23) [147] and one six-coordinated example (24) [148] with four tin-carbon bonds, all involving intramolecular N --7 Sn coordination, have been characterized.

3 I Me. 4) in which the tin atoms enjoy almost perfect octahedral coordination with only a small tetragonal distortion [215]. Tin(IV) sulphide and selenide both crystallize with the hexagonal CdI 2 layer lattice also with six-coordinated tin [216], and many polytypes have been characterized [217-219]. The structures adopted by stannates are profoundly different to those of silicates and germanates, in spite of the similarity in stoichiometries. Tin is in general six-coordinated in a regular or slightly distorted octahedral fashion by oxygen atoms, although four- and five-coordination do occur.

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Houben-Weyl Methoden der organischen Chemie vol.E5 Carboxylic Acid Derivates by Simchen G., et al. (eds.)


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