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Synthesis, molecular and crystal structures, and characteristic features of electronic structures of salicylamide-based B,Si-containing chelates

“…9 (O-B) Chelate 4 [2 (difluoroboroxy)benzoyl] 2,2,6,6 di methyl 2,6 disilamorpholine (4). Boron trifluoride etherate (1.3 g, 9 mmol) was added dropwise to disilamorpholine 3 (4.0 g, 13.5 mmol), which was placed in a flask equipped with a dephlegmator, a thermometer, and a condenser.…”

“…5 The formation of the target products was demonstrated 1-5 to proceed through intermediate pentacoordinate silicon compounds, which are more reactive in nucleophilic substitution reactions than the corresponding tetrahedral silicon derivatives 6 and can be synthesized also by the reactions of silacyclanes with electrophilic reagents. 7 In the case of salicylamide and N methylsalicylamide, analogous cyclosilylation reactions with the use of the hexamethyldisilazane-chloro(chloromethyl)dimethyl silane system afforded 1 oxa 4 aza 2 silabenzocyclo heptan 5 one derivatives.…”

“…7 In the case of salicylamide and N methylsalicylamide, analogous cyclosilylation reactions with the use of the hexamethyldisilazane-chloro(chloromethyl)dimethyl silane system afforded 1 oxa 4 aza 2 silabenzocyclo heptan 5 one derivatives. 8, 9 In particular, this method was used for the preparation of (O-B) chelate 4 (chloro dimethylsilylmethyl) 2,2 dimethyl 1 oxa 4 aza 2 sila benzocycloheptan 5 one (1) from salicylamide. Com pound 1 was used for the synthesis of the corresponding fluoride 2 and 4 (2 hydroxybenzoyl) 2,2,6,6 tetramethyl 2,6 disilamorpholine (3).…”