Temperature dependent 1H NMR study of the substrate complex derived from zinc(II) perchlorate, (R,R)-4,6-dibenzofurandiyl-2,2'-bis(4- phenyloxazoline), and 3-acetyl-2-oxazolidinone. Evidence for octahedral structure of the substrate complex

Tetrahedron Letters

Volumn 39, Issue 41, 1998, Pages 7521-7524

  Kanemasa, Shuji ^a   Oderaotoshi, Yoji ^a   Tanaka, Junji ^a   Wada, Eiji ^a  

^a KYUSHU UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

LIGAND; PERCHLORATE; ZINC;

ARTICLE; CATALYSIS; CHELATION; ISOMERISM; PROTON NUCLEAR MAGNETIC RESONANCE; REACTION ANALYSIS; STRUCTURE ANALYSIS; SYNTHESIS; TEMPERATURE DEPENDENCE;

EID: 0032497663     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(98)01635-9     Document Type: Article

References (7)

1. 1. (a) Kanemasa, S.; Oderaotoshi, Y.; Yamamoto, H.; Tanaka, J.; Wada, E.; Curran, D. P. J. Org. Chem. 1997, 62, 6454-6455.
2. (b) Kanemasa, S.; Oderaotoshi, Y.; Sakaguchi, S.; Yamamoto, H.; Tanaka, J.; Wada, E.; Curran, D. P. J. Am. Chem. Soc. 1998, 120, 3074-3088.
3. (c) Kanemasa, S.; Oderaotoshi, Y. J. Syn. Org. Chem. Jpn., 1998, 56, 368-376.
4. 2 complex is negligible.
5. 3. Syringe filter used for filtration of samples in hplc analysis can be conveniently employed to remove off the precipitate of silver iodide under dry argon. During this procedure, a little amount of water comes in to the sample solution.
6. 4. Zinc(II) complex catalyst C or D undergoes relatively ready aggregation to give colorless precipitate. 3-Acetyl-2-oxazolidinone (2) coordinates to this complex catalyst to suppress such aggregation.
7. 2): data of DBFOX/Ph and AOX ligands are as follows: DBFOX/Ph: δ = 4.35 (2H, t, J = 8.3 Hz), 4.91 (2H, dd, J = 10.1, 8.3 Hz), 5.53 (2H, dd, J = 10.1, 8.3 Hz), 7.2 - 7.5 (10H, m), 7.49 (2H, t, J = 7.7 Hz), 8.16 (2H, dd, J = 7.7, 1.2 Hz), and 8.18 (2H, dd, J = 7.7, 1.2 Hz). AOX: δ = 2.46 (3H, s), 3.96 (2H, t, J = 8.0), and 4.37 (2H, t, J = 8.0 Hz).