Multinuclear NMR study of compounds resulting from the silylation of indole; evidence for a 4,5-disilylation

Article abstract of DOI:10.1016/0022-328X(88)80473-X

Complete assignments of the 1H, 13C and 29Si NMR data of 1-, 4- and 5-trimethylsilyl-, 1,4- and 1,5-bis(trimethylsilyl)- and 1,4,5-tris(trimethylsilyl)-indoles allowed unambiguous confirmation of the structures proposed for these products.For the trisilylated derivative it was found that silylation had occurred at the 1,4,5 and not at 1,4,7 positions as previously suggested.