nyl-1,3,2-oxazaborolidine)]ethylene (4a) and 3,3 -[2, 2 -oxy-(4S-methyl-5R-phenyl-1,3,2-oxazaborolidine)-(1,3,2-benzoxazaborolidine) ## ]ethylene (4b) were synthesized by the reaction of N,N -bis-[(1R,2S)-norephedrine]oxalyl (3a) or N,N -[((1R,2S)-norephedrine, o-hydroxyphenylamine]oxalyl (3b) with
New 3,3′-[2,2′-Oxy-bis-(oxazaborolidine)]ethylenes. Structural Studies by NMR, X-Ray, and Quantum Chemistry Methods.
✍ Scribed by Margarita Tlahuextl; Antonio R. Tapia-Benavides; Angelina Flores-Parra; Rosalinda Contreras; Hugo Tlahuext; Elso M. Cruz
- Publisher
- John Wiley and Sons
- Year
- 2006
- Weight
- 16 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0931-7597
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## Abstract A variable‐temperature ^1^H‐NMR study and X‐ray structural analysis show that the most stable conformational isomer of [3.3](2,6)pyridinophane 2 is the __syn__(boat‐boat) conformer, and the relative stability order of the three stable conformers is __syn__(boat‐boat) > __syn__(chair‐boa
The Rh'(dio1efin)complexes [Rh(nbd)(2)] [PF,] [Rh( 1,5-cod)(2)] [PF,], and [Rh((Z)-a -acetamidocinnamic acid)(Z)] [PF,] (2 = the chiral P,N-ligand (S)-I -[bis(p -methylphenyl)phospino]-2-[(p -methoxybenzyl)amino]-3methylbutane) have been prepared and characterized. These complexes exist as a mixture