-
12
-
-
84918448442
-
-
A modified Ireland model which accentuates energetic and orientation non-eguivalence of carbonyl oxygen lone pairs in coordination with base has been advanced, but its necessity has been questioned.
-
(1982)
Tetrahedron Lett.
, pp. 4119
-
-
Narula1
-
20
-
-
0016777504
-
-
Exceptions to this statement concern the stereoselective Z-methyl deprotonation of ethyl 3-methylbut-2-enoate as established by Claisen rearrangement of the resulting dienolate
-
(1975)
J. Org. Chem.
, vol.40
, pp. 3309
-
-
Wilson1
Myers2
-
21
-
-
0010582437
-
-
and the study of stereoselective deprotonation of unsaturated tosyl hydrazones during the Shapiro reaction, We are very grateful to Dr. G.I. Feutrill, University of Melbourne, Australia for providing the last reference.
-
(1977)
J. Am. Chem. Soc.
, vol.99
, pp. 3414
-
-
Dauben1
Rivers2
l3
-
23
-
-
84942709251
-
A Note on Stereochemical Observations of the Deprotonation of Ethyl 2-Alkenoates
-
(1981)
Helvetica Chimica Acta
, vol.64
, pp. 1023
-
-
Krebs1
-
26
-
-
0001229094
-
-
This work, including studies on ester 3b, was first announced at the 66th CIC Conference, Calgary, Canada, June 5 – 8, 1983, Abstr. OR 21-2. In order to avoid overlap we exclude presentation ofour results on 3b which are in complete agreement with those reported by Harris and Weiler
-
(1982)
J. Org. Chem.
, vol.47
, pp. 163
-
-
Kende1
Toder2
-
27
-
-
84942709251
-
A Note on Stereochemical Observations of the Deprotonation of Ethyl 2-Alkenoates
-
(1981)
Helvetica Chimica Acta
, vol.64
, pp. 1023
-
-
Krebs1
-
28
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-
84918448441
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-
Preparation: Green, J.R.; Majewski, M.; Alo, B.I.; Snieckus, V. Tetrahedron Lett. accompanying communication.
-
-
-
-
30
-
-
84918448440
-
-
Prepared by stereoselective deuteration of the copper dienolate of N,N-dimethyl 3-methylbut-2-enamide.
-
-
-
-
32
-
-
0001677992
-
-
Prepared from N,N-dimethyl acetoacetamide according to Weiler's excellent procedure:
-
(1979)
Can. J. Chem.
, vol.57
, pp. 1431
-
-
Sum1
Weiler2
-
35
-
-
84918448439
-
-
This result agrees qualitatively with that reported for the analogous 3a in which a kinetic isotope effect was also observed.
-
-
-
-
36
-
-
33947085723
-
Conformational analysis by lanthanide induced shifts. I. Applications to .alpha.,.beta.-unsaturated aldehydes, ketones, esters, and amides
-
s-is-:s-trans conformer population ratios of substituted α,β-unsaturated ketones, esters, and amides determined by the LIS method favor substantially s-cis forms:
-
(1973)
Journal of the American Chemical Society
, vol.95
, pp. 6365
-
-
Montando1
Librando2
Caccamese3
Maravingna4
-
37
-
-
34250237140
-
-
The phenomenon of amide to lithium ion association has been thoroughly documented:
-
(1981)
Monatsh. Chem.
, vol.112
, pp. 25
-
-
Fuchs1
Rode2
-
42
-
-
84918448438
-
-
1,2 -stereochemistry.
-
-
-
-
44
-
-
84918448437
-
-
24 in which, as suggested, conformational energies determine the stereochemical outcome.
-
-
-
-
45
-
-
0001030975
-
-
Additional evidence for the significance of conformational effects in enolate formation has been very recently reported
-
(1985)
J. Am. Chem. Soc.
, vol.107
, pp. 1440
-
-
Chamberlin1
Reich2
-
46
-
-
84918448436
-
-
We are grateful to NSERC Canada for continuing financial support. J.R.G. is a Science 67 Scholarship awardee.
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