Abstract
Highly air- and moisture-sensitive complexes having sulfonamide ligands, (TsNR)2Ti(NMe2)2 (Ts = p-MeC6H4SO2), were prepared by treatment of two equivalents of TsNHR with Ti(NMe2)4 at room temperature. One of the compounds, where R = i-Pr (1), was studied in detail; the crystal structure of 1 revealed that both of the TsNi-Pr ligands were bound to the metal in an η2-coordination mode. Solution dynamics of 1 showed that an η1/η2 interconversion occurred above 60°C with an activation energy of 15.8 kcal mol-1. Treatment of Ti(NMe2)4 with the sulfonamide TsHN(CH2)2O(CH2)2NHTs (3), led to the formation of [TsN(CH2)2O(CH2)2NTs]Ti(NMe 2)2 (2) in high yield, in which the sulfonamide moiety was coordinated to the titanium center in an η3 (NON) mode. No sign of η1/η2 interconversion of the sulfonamide ligands was seen in solution. Treatment of 2 with Me3SiCl resulted in the formation of [{TsN(CH2)2O(CH2)2NTs}Ti(NMe 2)Cl]2 (4) and [{TsN(CH2)2O(CH2)2NTs}TiCl 2]2 (5). An X-ray structure determination of 4 revealed that sulfonyl oxygen bridging resulted in the formation of an eight membered ring.
Original language | English |
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Pages (from-to) | 1521-1527 |
Number of pages | 7 |
Journal | Journal of the Chemical Society, Dalton Transactions |
Issue number | 7 |
DOIs | |
Publication status | Published - 2002 |
All Science Journal Classification (ASJC) codes
- Chemistry(all)