C.-M. Che et al.
FULL PAPER
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[
[
reported styrene oxidations catalyzed by other ruthenium complexes
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1
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The styrene epoxidations with Cl
2
pyNO catalyzed by the dendritic
ruthenium porphyrins 5-[G-n] took a longer reaction time to reach
m
completion (up to 48 h) than those by 5 or [Ru(tmp)(CO)] (2 h,ref.
[4c]).
[23] This is rather surprising considering the presence of potentially
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[
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8
[G-2] ,which might render the catalyst susceptible to oxidative
degradation as mentioned in reference [3a]. The high stability
observed for catalyst 5-[G-2] might be rationalized by considering
8
the following possibilities. First,the alkene double bond in styrene
[
could be significantly more reactive than the foregoing benzylic CÀH
9
27; b) W.-C. Lo,C.-M. Che,K.-F. Cheng,T. C. W. Mak,
Chem.
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[
1
1
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solution of the compound in dichloromethane. Crystal data for b-31
[
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2
(C20
H
26
O
2
): M
r
298.41,monoclinic,space group P2
1
, a 7.157(1),
3
[
b 8.672(2), c 13.187(2) ä, b 92.700(4)8, V 817.5(2) ä , Z 2,
À3
À1
6
7
5; b) C.-J. Liu,W.-Y. Yu,S.-G. Li,C.-M. Che, J. Org. Chem. 1998, 63,
364.
1
calcd 1.212 Mgm , m(MoKa) 0.076 mm ,Bruker SMART CCD
diffractometer (l 0.71073 ä), T 294(2) K,reflections collected
5609,independent reflections 2622, R1 0.046,w R2 0.115,SHELXTL
program. CCDC-168909 (b-31) contains the supplementary crystallo-
graphic data for this paper. These data can be obtained free of charge
via www.ccdc.cam.ac.uk/conts/retrieving.html (or from the Cambridge
Crystallographic Data Centre,12 Union Road,Cambridge CB2 1EZ,
UK; fax: (44)1223-336033 or deposit@ccdc.cam.ac.uk).
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1
[
[
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ratios,and in the cases of 5-[G-n]
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m
(m 4,8; n 1,2) also by
1
[30] A. Kuhl,W. Kreiser, Helv. Chim. Acta 1998, 81,2264.
Note that the H
clearly separated from the intense signals of the outer Ph groups.
Some of the signals of 5-[G-2] are not well resolved,like the case of a
o
, H
o
' for 5-[G-n]
8
and H
m
, H
m
' for 5-[G-n]
4
are not
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8
zinc complex with the same dendritic porphyrin ligand (see ref. [12a]).
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[
[
Received: August 21,2001 [F3501]
1562
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Chem. Eur. J. 2002, 8,No. 7