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A financial award was also offered by InnoCentive for an efficient route to this compound (challenge #861093). No solution has yet been accepted. The reason for declining the present one was the impossibility to perform nitration in concentrated sulfuric acid on a large scale.
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Bernasconi, S.1
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74
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15044366166
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note
-
Cheapest commercial source: Alfa Aesar, US $ 370.00 for 2.5 kg.
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-
-
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75
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15044358202
-
-
note
-
2O] and CCDC-250617 [(1R,2R)-10] with the Cambridge Crystallographic Data Centre. Copies of the data can be obtained free of charge on application to The Director, CCDC, 12 Union Road, Cambridge CB2 1EZ, UK [Fax: (+44)1223-336-033; E-mail: deposit@ccdc.cam.ac.uk].
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77
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15044350105
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note
-
Cheapest commercial sources: a) Senn Chemicals AG, US $ 583.00 for 1 kg; b) ChemPacific USA Sales Marketing and Research Center, US $ 880.00 for 1 kg, US $ 3,200.00 for 5 kg, bulk available.
-
-
-
-
78
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15044361513
-
-
note
-
Cheapest commercial sources: a) Senn Chemicals AG, US $ 583.00 for 1 kg; b) ChemPacific USA Sales Marketing and Research Center, US $ 880.00 for 1 kg, US $ 3,200.00 for 5 kg, bulk available.
-
-
-
-
79
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0026418434
-
-
B. M. Trost, Science 1991, 254, 1471-1477.
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(1991)
Science
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-
Trost, B.M.1
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80
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15044364270
-
-
note
-
Cheapest commercial sources: a) Pfaltz&Bauer, Inc., US $ 62.35 for 1 kg; b) Acrōs Organics, US $ 71.70 for 1 kg; c) City Chemical LLC, US $ 38.50 for 1 kg.
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-
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81
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15044350219
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note
-
Cheapest commercial sources: a) Pfaltz&Bauer, Inc., US $ 62.35 for 1 kg; b) Acrōs Organics, US $ 71.70 for 1 kg; c) City Chemical LLC, US $ 38.50 for 1 kg.
-
-
-
-
82
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15044365258
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note
-
Cheapest commercial sources: a) Pfaltz&Bauer, Inc., US $ 62.35 for 1 kg; b) Acrōs Organics, US $ 71.70 for 1 kg; c) City Chemical LLC, US $ 38.50 for 1 kg.
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83
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15044345212
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note
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Cheapest commercial sources: a) Oakwood Products, Inc., US $ 62.00 for 1 kg; b) City Chemical LLC, US $ 109.00 for 2.5 kg; c) Fluorochem Ltd., £ 95.00 for 5 kg.
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-
-
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84
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15044358500
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-
note
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Cheapest commercial sources: a) Oakwood Products, Inc., US $ 62.00 for 1 kg; b) City Chemical LLC, US $ 109.00 for 2.5 kg; c) Fluorochem Ltd., £ 95.00 for 5 kg.
-
-
-
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85
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15044347970
-
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note
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Cheapest commercial sources: a) Oakwood Products, Inc., US $ 62.00 for 1 kg; b) City Chemical LLC, US $ 109.00 for 2.5 kg; c) Fluorochem Ltd., £ 95.00 for 5 kg.
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86
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15044361230
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note
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[10e] respectively. However, this decreases the yield to 85 and 82.5%, respectively, as rac-8 is rather well soluble in both solvents. Moreover, the main impurity - succinimide - remains even after recrystallization (from traces and up to 5%). As this impurity is very poorly soluble in diethyl ether, we have slightly modified the procedure in this point.
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87
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15044355735
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note
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1H NMR spectrum. Unlike this, the extraction with tert-butyl methyl ether proceeds at a lower temperature and without undesirable side reactions.
-
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88
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15044356013
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note
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4 by atmospheric moisture only.
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-
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89
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15044350218
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UK Pat. Appl. GB 2382074 A1, 2003
-
The recovery of (-)-dibenzoyl L-tartrate has been described in the patents: a) S. Martin, D. Piergentili, UK Pat. Appl. GB 2382074 A1, 2003; Chem. Abstr. 2003, 138, 385169; b) J. Jendrichovsky, L. Stibranyi, Recovery of (+)- and (-)-dibenzoyltartaric acid monohydrate after resolution of optically active forms of a-methyl-β-dimethylaminopropiophenone. Czech. Patent, 1975; Chem. Abstr. 1975, 83, 78879. However, these patents do not cover our method, as in both patents the substituted tartaric acid derivatives from the resolution process were firstly neutralized by adding a base (for example, aqueous sodium bicarbonate), extracted into an aqueous phase, and secondly crystallized from the aqueous phase by addition of a mineral acid.
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(2003)
Chem. Abstr.
, vol.138
, pp. 385169
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Martin, S.1
Piergentili, D.2
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90
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15044364574
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Recovery of (+)- and (-)-dibenzoyltartaric acid monohydrate after resolution of optically active forms of a-methyl-β- dimethylaminopropiophenone. Czech. Patent, 1975
-
The recovery of (-)-dibenzoyl L-tartrate has been described in the patents: a) S. Martin, D. Piergentili, UK Pat. Appl. GB 2382074 A1, 2003; Chem. Abstr. 2003, 138, 385169; b) J. Jendrichovsky, L. Stibranyi, Recovery of (+)- and (-)-dibenzoyltartaric acid monohydrate after resolution of optically active forms of a-methyl-β-dimethylaminopropiophenone. Czech. Patent, 1975; Chem. Abstr. 1975, 83, 78879. However, these patents do not cover our method, as in both patents the substituted tartaric acid derivatives from the resolution process were firstly neutralized by adding a base (for example, aqueous sodium bicarbonate), extracted into an aqueous phase, and secondly crystallized from the aqueous phase by addition of a mineral acid.
-
(1975)
Chem. Abstr.
, vol.83
, pp. 78879
-
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Jendrichovsky, J.1
Stibranyi, L.2
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91
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15044362331
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note
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2O can have a dark color.
-
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92
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15044348337
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note
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[24]
-
-
-
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93
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15044354758
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note
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20: +45.3 (c 1.672, MeOH) and +47.0 (c 2.088, MeOH), respectively), the progress of purification can better be monitored by measuring the melting points. The second salt is better soluble in EtOH and in THF than the first one.
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-
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94
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15044360675
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note
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[1]
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