Nakatsuji, Jun-ya published the artcileSynthesis and structure of boron compounds bearing tridentate ligands with 1,3-bicarbonylbenzene skeleton, SDS of cas: 25240-59-9, the publication is Bulletin of the Chemical Society of Japan (2010), 83(7), 767-776, database is CAplus.
In order to examine differences in structure due to the electronic nature of the oxygen ligand, several organoboron compounds bearing ester BXL1 (L1 = 2,6-bis(tert-butoxycarbonyl)phenyl, X = pinacolato, 8a; X = catecholato, 8b; X = fluorenyl, 8c) and amide BXL2 (L2 = 2,6-bis(N,N-diisopropylaminocarbonyl)phenyl, X = pinacolato, 13a and X = catecholato, 13b) ligands were prepared and crystallog. analyzed. In the ester ligand systems, the pinacolato derivative 8a and catecholato derivative 8b took a pentacoordinate structure, while fluorenyl derivative 8c took a tetracoordinate structure instead of pentacoordinate due to the strong electrophilic nature of the boron atom. In contrast to the ester ligand systems, no pentacoordinate species were found in the amide ligand systems. The pinacolato derivative 13a is tricoordinated, and catecholato derivative 13b is tetracoordinated. These results could be due to the steric effect of the diisopropylamide ligand together with the electronic effects. The VT NMR study and the DFT calculations reveal that the energy difference between the tetracoordinate and pentacoordinate structure in 8c is very small, and indicated that the electronic nature and steric effects of the ligand greatly affect the coordination state of the boron atom.
Bulletin of the Chemical Society of Japan published new progress about 25240-59-9. 25240-59-9 belongs to alcohols-buliding-blocks, auxiliary class Boronic acid and ester,Boronic Acids,Boronate Esters, name is 4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-ol, and the molecular formula is C6H13BO3, SDS of cas: 25240-59-9.
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