Citation:
Gao Lianxun, Ding Mengxian. SYNTHESS OF TWO NOVEL CHIRAL 1, 6-DIPHOSPHINES[J]. Chinese Journal of Applied Chemistry,
;1989, 6(1): 26-29.
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Two novel chiral diphosphines, 1, 6 -bis(diphenyl-phosphino)-2, 3, 4, 5- dibenzylidene-D-mannitol and 1, 6-bis-(diphenylphosphino)-3, 4-benzylidene- 2, 5-methylene-D-mannitol have been synthesized from D-mannitol. The Rh(I) complexes of both chiral ligands have been used as catalysts in the asymmetic hydrogenation of α-acetamidocinnamic acid, but no enantioselectivity was observed in both cases, furthermore, no hydrogenation activity was Shown in the reaction in the presence of the former ligand.A preliminary explanation of the results observed in asymmetrie hydrogenation is suggested in the paper.
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Keywords:
- D-mannitol,
- Chiral diphosphine,
- Asymmetric hydrogenation
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