Zobrazeno 1 - 10 of 75 pro vyhledávání: '"R. F. Rekker"'
1
Derivatives of oxazolidinedione-2,4: II. The reaction of α-hydroxy-esters with isocyanates
Autor: W. Th. Nauta, R. F. Rekker, D. H. E. Tom, H. Verleur, A. C. Faber
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 70:113-126
The reaction between an isocyanate and an α-hydroxy-ester leads to the formation of an N-substituted carbamylo-α-hydroxy-ester, which can give an oxazolidinedione-2,4 under the influence of a small amount of metallic sodium by ring closure with the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3dc29b413888e4560e9589074612939b
https://doi.org/10.1002/recl.19510700205
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2
A molecular compound of mandelic acid and ethyl mandelate
Autor: A. de Roos, W. Th. Nauta, M. J. E. Ernsting, R. F. Rekker
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 80:792-796
From a quantity of ethyl mandelate there separated, after prolonged storage, a crystalline compound, which was found to consist of mandelic acid and ethyl mandelate in a 1 : 1 ratio. This product can also be prepared in situ by mixing equivalent amou
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7d94d9a02d6befeaf6732f41519e6d71
https://doi.org/10.1002/recl.19610800711
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3
Aconic acid and related compounds: I. Discussion of the structure of aconic acid
Autor: R. F. Rekker, H. Hamann, W. Th. Nauta, P. J. Brombacher
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 73:410-416
To aconic acid, first described in literature by Kekule, the structure of a β,γ-butenolide was given by Fittig and Beer. In 1947 Campbell and Hunt put forward arguments for an α,β-butenolide structure. These arguments were based on a new synthesi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3da6a26294af0a97598d18f9a1bca570
https://doi.org/10.1002/recl.19540730509
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4
The alkaline hydrolysis of oxazolidinediones-2,4
Autor: W. Th. Nauta, R. F. Rekker
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 79:843-853
Controversial structures have been assigned 1,2 to the nitrogen-containing carboxylic acid which is one of the products formed on hydrolysis of N-substituted oxazolidinediones-2,4. The present publication solves the problem in favour of our previous
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f506eac749c2e0178e289b94d5fc85b8
https://doi.org/10.1002/recl.19600790810
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5
Synthesis and conformation of 2-alkyl-1-(ORTHO-alkyl)phenylcyclohexanols
Autor: Hendrik Timmerman, R. F. Rekker, W. Th. Nauta
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 84:1348-1356
Several 2-alkyl-1-(ortho-alkyl)phenylcyclohexanols have been synthesized from lithium compounds (obtained from alkylbromobenzenes) and 2-alkyl-cyclohexanones. G.L.C. analysis has shown that only one isomer is formed. The conformation was elucidated w
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ebf39e29d04fa4e794da2ee026b098cc
https://doi.org/10.1002/recl.19650841018
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7
The U.V. absorption spectra of p. Amino-salicylic acid and some related compounds (I)
Autor: C. v. d. Stelt, R. F. Rekker, W. Th. Nauta
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 70:675-680
The U.V. absorption spectra of p.amino-salicylic acid were measured both in water and in ethanol. The results of these measurements show that there is no discrepancy between the work of Way a.o. and Drain a.o. as was suggested by the latter authors.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0395d610e1669dcd637524ec31faf8d3
https://doi.org/10.1002/recl.19510700804
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8
Ultraviolet absorption spectra of some aromatic tricyclic ketones
Autor: W. Th. Nauta, R. F. Rekker
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 90:343-351
The UV absorption spectra of a small series of aromatic tricyclic ketones derived from benzophenone by introduction of an interconnecting -(CH2)n-bridge (n = 1, 2, or 3) are described. The spectra show well-defined steric effects in the 270-nm region
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::08780b4527933ea8e2e403b02f2c8e15
https://doi.org/10.1002/recl.19710900313
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9
Hydrolytic dissociation constants of substituted 4-aminobenzoic acids
Autor: J. M. Los, R. F. Rekker, C. H. T. Tonsbeek
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 86:609-621
Composite hydrolytic dissociation constants, KI and KII, of 4-aminobenzoic acids substituted as follows, 2-H-, 2-CH3-, 2-Cl-, 2-Br-, 2-NO2-, 2-OH-, 2-OCH3-, 3-Br-, 2,6-(CH3)2-, 2,6-(C2H5)2-, 2,6-Cl2- and 2,6-Br2-, have been determined in aqueous solu
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb3f0755130603cf793ebc5b63ab7896
https://doi.org/10.1002/recl.19670860607
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10
Steric effects on the electronic spectra of substituted benzophenones. V. Some alkyl-substituted benzophenones
Autor: R. F. Rekker, W. Th. Nauta
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 80:764-774
This article gives the experimental results of UV measurements made on a number of benzophenones with ethyl, isopropyl and tert.butyl groups as substituents. The results are compared with the previously published data on the corresponding methyl-subs
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::83f35d35bedd2d6f8e95b6c02b92d303
https://doi.org/10.1002/recl.19610800709
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