In:
Chirality, Wiley, Vol. 27, No. 8 ( 2015-08), p. 479-486
Abstract:
Two analogs of blestriarene C (4,4'‐dimethoxy‐1,1'‐biphenanthrene‐2,2',7,7'‐tetraol) bearing no 7,7'‐dihydroxy ( 3 ) and 4,4'‐dimethoxy groups 4 were prepared. Unlike blestriarene C ( 1 ), compounds 3 and 4 , as well as 1,1'‐biphenanthrene‐2,2'‐diol ( 5 ), do not racemize under fluorescent lamp illumination. Cyclic voltammetry analysis reveals that compound 1 has a lower half‐wave potential ( E 1/2 ) than compounds 3 , 4 , 5 , suggesting that a redox cycle is involved in the racemization. Compound 1 racemizes by absorbing UV light corresponding to the 1 L b band. During the reaction, no side products are observed. The racemization is significantly inhibited under nitrogen. Based on these observations, we propose a feasible mechanism for the easy racemization of compound 1 , which is mediated by a cation radical generated in situ by a reversible photo‐induced oxygen oxidation. Chirality 27:479–486 , 2015 . © 2015 Wiley Periodicals, Inc.
Type of Medium:
Online Resource
ISSN:
0899-0042
,
1520-636X
Language:
English
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
2001237-8
SSG:
12
SSG:
15,3
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