Chemistry Reference
In-Depth Information
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38. Berlin , J. M. ; Goldberg , S. D. ; Grubbs , R. H.
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40. Cortez , G. A. ; Baxter , C. A. ; Schrock , R. R. ; Hoveyda , A. H.
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41. Endo - substituted
[3.2.1] - bicycles
are
typically
more
reactive
than
the
corresponding
exo -
diastereomers due to increased ring strain.
42. For discussions regarding enantioselective formation of C - halogen bonds; see: (a) Ibrahim , H. ; Togni ,
A .
Chem. Comm.
2004
, 1147 - 1155 . (b) Gaunt , M. J. ; Johansson , C. C.
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107
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5605 . (c) Sakakura , A. ; Ukai , A. ; Ishihara , K.
Nature
2007
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445
, 900 - 903 . (d) Kotsuki , H. ; Ikishima ,
H. ; Okuyama , A.
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2008
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75
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43. Gillingham , D. G. ; Hoveyda , A. H.
Angew. Chem. Int. Ed.
2007
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46
, 3860 - 3864 .
44. Cortez , G. A. ; Schrock , R. R. ; Hoveyda , A. H.
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46
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45. This concept has been applied to the synthesis of azabicycles through ring-closing metathesis; see:
Neipp , C. E. ; Martin , S. F.
J. Org. Chem.
2003
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68
, 8867 - 8878 .
46. Although Mo complex
1b
affords
>
98% conversion, the desired products are obtained in
<
2% ee. All
other Mo catalysts fail to deliver the desired product (
<
2% conversion).
47. Maison ,
W. ;
B ü chert ,
M. ;
Deppermann ,
N.
Beilstein J. Org. Chem.
2007
,
3
(DOI:
10.1186/1860 - 5397 - 3 - 48).
48. Giudici , R. E. ; Hoveyda , A. H.
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49. (a) Bornand , M. ; Chen , P.
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44
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Chen , P.
Organometallics
2007
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26
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50. The r value is a mathematical description of the sequence selectivity of the alternating copolymeriza-
tion; see: Polic , A. L. ; Duever , T. A. ; Penlidis , A.
J. Polym. Sci. A
1998
,
36
, 813 - 822 .
51. For a review of catalytic cross - metathesis reactions, see: Connon , S. J. ; Blechert , S.
Angew. Chem. Int.
Ed.
2003
,
42
, 1900 - 1923 .
52. For a review of catalytic enyne metathesis reactions, see: Diver , S. T. ; Giessert , A.
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2004
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104
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