A new optically active secondary diphosphine - Its use for the improved synthesis of (R,R)-1,2-bis(boranato(tert-butyl)methylphosphino)ethane

Tetrahedron Letters

Volumn 43, Issue 43, 2002, Pages 7735-7737

  Crépy, Karen V L ^a   Imamoto, Tsuneo ^a  

^a CHIBA UNIVERSITY   (Japan)

Author keywords

Alkylation; C2 symmetric; Counter enantiomer; Oxidative coupling; Phosphine ligand

Indexed keywords

1,2 BIS[BORANATO(TERT BUTYL)METHYLPHOSPHINO]ETHANE; BORANE DERIVATIVE; DIPHOSPHANE BORANE; DIPHOSPHINE; ETHANE; LITHIUM DERIVATIVE; PHOSPHINE DERIVATIVE; SPARTEINE; UNCLASSIFIED DRUG;

ARTICLE; CATALYSIS; CHEMICAL REACTION; CHIRALITY; ELECTRON; ENANTIOMER; ENANTIOSELECTIVITY; PRODUCTIVITY; SYNTHESIS;

EID: 0037152296     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(02)01829-4     Document Type: Article

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19. 2: C, 49.03; H, 11.66. Found: C, 49.16; H, 11.78%.
20. 2: C, 51.35; H, 12.93. Found: C, 51.68; H, 13.08%.
21. HPLC analysis of crude (R,R)-t-Bu-BisP* (2) synthesized from 3 before recrystallization revealed 98% ee.
22. 13C NMR), are significantly different for the borane complexes of (S,S)-BisP* and meso-BisP*.
23. D of (S,S)-t-Bu-BisP* was observed.
24. 2: 414.16. Found: 414.2952.
25. 4: 378.05. Found: 378.2271.
26. 2: C, 53.72; H, 12.30. Found: C, 53.71; H, 12.29%.
27. 2K: 313.08. Found: 313.1965.
28. Dichloromethane gave a cleaner reaction than dibromomethane.
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