-
1
-
-
84990074495
-
-
Lectures before the Société Chimique de Paris on January 20 and February 3, 1860
-
-
-
Pasteur, L.1
-
28
-
-
0039342885
-
Funktionelle Gruppen in konkaver Lage: Asymmetrische Diels-Alder-Synthese mit nahezu vollständiger (Lewis-Säure-katalysiert) und hoher (unkatalysiert) Stereoselektivität
-
(1981)
Angewandte Chemie
, vol.93
, pp. 208
-
-
Helmchen, G.1
Schierer, R.2
-
33
-
-
0000442517
-
Methoden der asymmetrischen Synthese – enantioselektive katalytische Hydrierung
-
(1971)
Angewandte Chemie
, vol.83
, pp. 956
-
-
Izumi, Y.1
-
64
-
-
84984294066
-
Chirale Induktion bei photochemischen Reaktionen, IX. Isoselektivität bei der asymmetrischen Paterno-Büchi-Reaktion unter Verwendung von Kohlenhydraten als chirale Auxiliare
-
(1989)
Chemische Berichte
, vol.122
, pp. 487
-
-
Pelzer, R.1
Jütten, P.2
Scharf, H.‐D.3
-
73
-
-
84990154806
-
-
(b) Merck‐Schuchardt, MS‐INFO 85‐17 (8‐phenylmenthol).
-
-
-
-
114
-
-
84990157183
-
-
See Ref. [7], p. 275.
-
-
-
-
117
-
-
84990153982
-
-
Dissertation, Technische Hochschule Aachen 1984.
-
-
-
Koch, H.1
-
136
-
-
0040574804
-
-
(1972)
Acc. Chem. Res.
, vol.5
, pp. 92
-
-
Turro, N.J.1
Dalton, F.C.2
Dawes, K.3
Farrington, G.4
Houtala, R.5
Morton, D.6
Morton, M.7
Niemczyk, M.8
Shore, N.9
-
142
-
-
0000007957
-
The Photocycloaddition of Carbonyl Compounds to Unsaturated Systems: The Syntheses of Oxetanes
-
(1968)
Adv. Photochem.
, vol.6
, pp. 301
-
-
Arnold, D.R.1
-
158
-
-
0003056707
-
-
(1978)
Org. Photochem.
, vol.3
, pp. 1
-
-
Saltiel, J.1
D'Agostino, J.2
Megarity, E.D.3
Metts, L.4
Neusberger, K.R.5
Wrighton, M.6
Zafiriou, O.L.7
Chapman, O.C.8
-
164
-
-
0023708099
-
Preparative visible-laser photochemistry: Qinghaosu-type 1,2,4-trioxanes by molecular oxygen trapping of Paterno-Buechi triplet 1,4-diradicals derived from 3,4-dihydro-4,4-dimethyl-2H-pyran-2-one and quinones
-
(1988)
The Journal of Organic Chemistry
, vol.53
, pp. 4986
-
-
Adam, W.1
Kliem, U.2
Monsandl, T.3
Peters, E.‐M.4
Peters, K.5
von Schnering, H.G.6
-
166
-
-
84990081381
-
-
Dissertation, Technische Hochschule Aachen
-
(1987)
-
-
Weuthen, M.1
-
167
-
-
84990123030
-
-
Dissertation, Technische Hochschule Aachen
-
(1988)
-
-
Vassen, R.1
-
168
-
-
84990132373
-
-
Dissertation, Technische Hochschule Aacben
-
(1991)
-
-
Buschmann, H.1
-
169
-
-
84990132375
-
-
Diplomarbeit, Technische Hochschule Aachen 1986.
-
-
-
Hoffmann, N.1
-
170
-
-
84990132380
-
-
13C‐NMR spectrum according to (24), where c is the concentration of the major diastereomer, and c′ the concentration of the minor diastereomer in the product mixture. Depending on the system, between 14 and 16 pairs of signals can be drawn on for determination of the de value. The de values given in Table 1 are averages of several independent measurements. By using this technique, the influence of nuclear Overhauser and spin relaxation effects can be kept to a minimum.
-
-
-
-
179
-
-
84990162398
-
-
Dissertation, Technische Hochschule Aachen
-
(1991)
-
-
Plath, M.W.1
-
180
-
-
0001728892
-
Methoden der Reaktivitätsumpolung
-
(a) The concepts of diastereo‐ and regioselectivity are used in the sense of D. Seebach's definition.
-
(1979)
Angewandte Chemie
, vol.91
, pp. 259
-
-
Seebach, D.1
-
186
-
-
84990136179
-
-
It should be noted here that in this correlation the rate constant quotients obtained from the diastereomeric excesses have been related to those of the unsubstituted system. This affects the ϱ value found, in that the σ values (defined as quotients of the equilibrium constants for the substituted or unsubstituted systems) are taken from references where they had been determined by direct quotient formation from the rate constants for substituted or unsubstituted systems.
-
-
-
-
207
-
-
0011764239
-
Die Bedeutung isoselektiver Temperaturen für die Existenz linearer Freie-Energie-Beziehungen
-
(1980)
Angewandte Chemie
, vol.92
, pp. 864
-
-
Giese, B.1
-
211
-
-
84980149876
-
Zur Temperaturabhängigkeit der Selektivität von π-und σ-Radikalen
-
161, 723
-
(1976)
Angewandte Chemie
, vol.88
, pp. 159
-
-
Giese, B.1
-
223
-
-
84990161403
-
-
The presence of an inversion point in temperature‐dependent regioselectivity was not recognized by us in the original publication. [34] A new analysis of the original experimental data in the light of the isoinversion relationship, however, indicated the existence of an inversion point in the Eyring diagram.
-
-
-
-
224
-
-
84990161404
-
-
At this point, the usefulness in mechanistic studies of auxiliaries that yield diastereomeric excesses in the low to middle range should be noted. Middle range de values are especially sensitive to small variations in reactant structure and/or minor changes in reaction conditions [36, 37].
-
-
-
-
229
-
-
0001057537
-
-
(f) see Ref. [39a]
-
(1986)
Tetrahedron
, vol.42
, pp. 2993
-
-
Whitesell, J.K.1
Bhattacharya, H.A.2
Buchanan, C.M.3
Chen, H.H.4
Deyo, D.5
James, D.6
Liu, C.7
Minton, M.A.8
-
231
-
-
84990162855
-
-
See Ref. [6], p. 40.
-
-
-
-
240
-
-
84956733937
-
Kinetik und Mechanismus katalytischer Additionsreaktionen an kumulierte Doppelbindungssysteme, III. Tieftemperaturkinetik, H-Isotopeneffekte und Verlauf aminkatalysierter Additionen von Alkoholen an Phenylmethyl- und Diphenylketen
-
(1967)
Chemische Berichte
, vol.100
, pp. 196
-
-
Tille, A.1
Pracejus, H.2
-
255
-
-
84953869516
-
-
(1967)
Chem. Ber.
, vol.100
, pp. 1575
-
-
-
260
-
-
84990158706
-
-
See Ref. [91].
-
-
-
-
272
-
-
0001213707
-
Asymmetrische Synthesen mit Ketenen, III. Über den Lösungsmitteleinfluß auf den sterischen Ablauf zweier asymmetrischer Amidsynthesen
-
(1963)
Chemische Berichte
, vol.96
, pp. 854
-
-
Pracejus, H.1
Tille, A.2
-
274
-
-
84990155792
-
-
See Ref. [6], p. 276f.
-
-
-
-
276
-
-
84990152966
-
-
See Ref. [7], p. 53.
-
-
-
-
277
-
-
84990111261
-
-
See Ref. [6]. p. 160 ff. and 297 ff.
-
-
-
-
361
-
-
0039314238
-
Cob(I)alamin as Catalyst. 8th Communication. Cob(I)alamin and Heptamethyl Cob(I)yrinate During the Reduction of ?,?-Unsaturated Carbonyl Derivatives
-
(1980)
Helvetica Chimica Acta
, vol.63
, pp. 1628
-
-
Fischli, A.1
Daly, J.J.2
-
363
-
-
2342499124
-
Asymmetric hydrogenation catalyzed by the (achiral base)bis(dimethylglyoximato)cobalt(II)-chiral cocatalyst system. The preparation of a new type of chiral cocatalyst and its application to the asymmetric hydrogenation of methyl N-(acetylamino)acrylate and benzil.
-
(1981)
Bulletin of the Chemical Society of Japan
, vol.54
, pp. 2136
-
-
Takeuchi, S.1
Ohgo, Y2
-
368
-
-
0000796288
-
Asymmetrische Hydrierung von α-(Acetylamino)zimtsäure mit einem neuen Rhodiumkomplex; die Konzeption eines optimalen Liganden
-
(1984)
Angewandte Chemie
, vol.96
, pp. 425
-
-
Nagel, U.1
-
371
-
-
0000119119
-
Enantioselektive Katalyse, 5. Neue Liganden mit vier Stereozentren. Synthese und Trennung der drei diastereomeren [P(R,S),3R,4R,P′(R,S)]-3,4-Bis(methylphenylphosphino)-pyrrolidine
-
(1988)
Chemische Berichte
, vol.121
, pp. 1123
-
-
Nagel, U.1
Rieger, B.2
-
372
-
-
4243385107
-
-
The δ/λ conformation of the RhPCCP five‐membered ring is defined as in the corresponding structural element MNCCN in numerous ethylene‐diamine complexes; cf. The Commission on the Nomenclature of Inorganic Chemistry of the International Union of Pure and Applied Chemistry
-
(1970)
Inorg. Chem.
, vol.9
, pp. 1
-
-
-
373
-
-
84990120804
-
-
According to Brown et al., in seven‐membered chelate rings the product configuration is determined by the chair or twist‐boat conformation of the catalyst complex. Starting from (Z)‐enamides, the chair conformation yields (S)‐amino acids, whereas the twist‐boat form leads to the(R)‐enantiomer [173 a]
-
-
-
-
413
-
-
84990117477
-
-
See Ref. [7], p. 100.
-
-
-
-
414
-
-
84990117484
-
-
See Ref. 161, p. 302.
-
-
-
-
422
-
-
84990152512
-
-
5).
-
-
-
-
443
-
-
0542442813
-
-
(1989)
J. Am. Chem. Soc.
, vol.111
, pp. 8166
-
-
Endo, T.1
Takei, H.2
Isago, T.3
Kato, J.4
Ito, M.M.5
Guro, K.6
Akiyama, K.7
Nakaijama, Y.8
Kataoka, H.9
-
444
-
-
0345956770
-
The role of molecular shape similarity in specific molecular recognition
-
(1985)
Top, Curr. Chem.
, vol.128
, pp. 91
-
-
Endo, T.1
-
451
-
-
84984360285
-
Enantioselektive Addition von Organometallreagentien an Carbonylverbindungen: Übertragung, Vervielfältigung und Verstärkung der Chiralität
-
(1991)
Angewandte Chemie
, vol.103
, pp. 34
-
-
Noyori, R.1
Kitamura, M.2
-
468
-
-
84990078369
-
-
(c) Ref. [256]
-
-
-
-
470
-
-
84990095175
-
-
See Ref. [256d, e].
-
-
-
-
479
-
-
84990095185
-
-
(a) See Ref. [87]
-
-
-
-
486
-
-
84990139231
-
-
(a) [158]
-
-
-
-
488
-
-
26444466057
-
-
According to H. Wynberg, the use of racemic auxiliaries for determining de values is only permissible to a first approximation. Because of the presence of chiral reagents, the medium itself becomes chiral, giving a chiral solvent effect. In a racemic system, the interactions of the enantiomers with each other (RR, RS and SS interactions) can lead to differing asymmetric induction
-
(1976)
Tetrahedron
, vol.32
, pp. 2831
-
-
Wynberg, H.1
Feringa, B.2
-
489
-
-
84990095202
-
-
The analysis of the data for pressure‐dependent selectivity measurements must be treated with caution in some cases, since the experimental details for the measurements were not given in the literature. The appearance of the inversion points described could hence also be due to non‐uniform experimental conditions. We thank R. Selke for this observation.
-
-
-
-
508
-
-
0342706214
-
The enantioface-differentiating (asymmetric) hydrogenation of the C=O double bond with modified raney nickel. XXXIV. The adsorption mode of 2-hydroxy acid on Raney nickel.
-
(1980)
Bulletin of the Chemical Society of Japan
, vol.53
, pp. 1019
-
-
Harada, T.1
-
509
-
-
84990148920
-
-
Dissertation, Technische Universität München
-
(1986)
-
-
Youn, J.‐H.1
-
510
-
-
25344475195
-
Basekatalysierte asymmetrische Induktion der Reaktion von Methyl(phenyl)keten mit 1-Phenylethanol: Gewinnung von Hydratropasäure in hoher Enantiomerenreinheit
-
(1981)
Angewandte Chemie
, vol.93
, pp. 919
-
-
Jähme, J.1
Rüchardt, C.2
-
533
-
-
0001381075
-
Asymmetric Reductions with Chiral Complex Aluminum Hydrides and Tricoordinate Aluminum Reagents
-
(1983)
Top. Stereochem.
, vol.14
, pp. 231
-
-
Haubenstock, H.1
-
543
-
-
84985072189
-
-
(1977)
Helvetica Chimica Acta
, vol.60
, pp. 301
-
-
Seebach, D.1
Kalinowski, H.‐O.2
Bastani, B.3
Cross, G.4
Daum, H.5
Dörr, H.6
DuPreez, N.P.7
Ehrig, V.8
Langer, W.9
Nüssler, C.10
Oei, H.‐A.11
Schmidt, M.12
|