Zobrazeno 1 - 10
of 13
pro vyhledávání: '"J. A. Keverling Buisman"'
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 66:83-92
A new synthesis of 7-dehydrocholesterol (provitamin D3) from cholesterol is described, which gives a higher yield than the well known Windaus synthesis. The synthesis is carried out via a 7-bromocholesteryl ester, from which hydrogen bromide is elimi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2316c713ddb6c6a1b01e432cfd93689a
https://doi.org/10.1002/recl.19470660205
https://doi.org/10.1002/recl.19470660205
Autor:
H. J. Backer, J. A. Keverling Buisman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 64:102-108
Pour etudier leur activite sulfonamide, les auteurs ont prepare quelques sulfures et sulfones mixtes des types 4-NH2˙ C6H4 ˙ SR et 4-NH2 ˙ C6H4 ˙ SO2R.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17ae6a3693bc1b8cbf151e842a581680
https://doi.org/10.1002/recl.19450640403
https://doi.org/10.1002/recl.19450640403
Autor:
P. Westerhof, J. A. Keverling Buisman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 71:925-932
A description is given of the synthesis of the thio-analogues of ergosterol and 7-dehydrocholesterol from these two compounds.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b7b9be9e4b81b7716165b4d00ff7cce
https://doi.org/10.1002/recl.19520710910
https://doi.org/10.1002/recl.19520710910
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 77:327-330
Results of kinetic investigations and measurements of quantum yields are reported, which cannot be explained by the most simple scheme imaginable for the photochemical interconversions of provitamin-D and its isomers. At least two excited transitory
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ec11430982c433e2d724391fa4b8979
https://doi.org/10.1002/recl.19580770404
https://doi.org/10.1002/recl.19580770404
Autor:
P. Westerhof, J. A. Keverling Buisman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 78:659-662
The results are presented of investigations on preparing dihydrotachysterol2 from dihydrovitamins D2-I and D2-II.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7811bcdb00195bcb67fdf3801c220a4
https://doi.org/10.1002/recl.19590780904
https://doi.org/10.1002/recl.19590780904
Autor:
P. Westerhof, J. A. Keverling Buisman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 76:679-688
Some partially hydrogenated derivatives of ergocalciferol are described; their structures are discussed, and their activities in raising the serum calcium level of rats are reported.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab6e0fc9be3a4c4020877a030c426131
https://doi.org/10.1002/recl.19570760902
https://doi.org/10.1002/recl.19570760902
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 75:1179-1186
Whereas dihydrovitamin D3 I and dihydrovitamin D3 II can be isolated from the mixtures obtained on reduction of cholecalciferol with sodium and alcohols, attempts to obtain dihydrotachysterol3 in a crystalline state from such mixtures were unsuccessf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d96b4716f93aa134a9ba752011daed61
https://doi.org/10.1002/recl.19560751012
https://doi.org/10.1002/recl.19560751012
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 77:241-248
A study is presented of the conversion of ergosterol and pre-ergocalciferol by U.V. light of 254 mμ From the experiments certain conclusions are drawn regarding the formation of tachysterol2 from ergosterol and on the quantum-efficiency of the inter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::52e7c8d956d64f6cb6f567d7f595c832
https://doi.org/10.1002/recl.19580770305
https://doi.org/10.1002/recl.19580770305
Autor:
P. Westerhof, J. A. Keverling Buisman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 75:1243-1251
From the “toxisterol2” mixture obtained by prolonged U.V. irradiation of ergosterol two or possibly three hitherto unknown compounds have been isolated in the form of crystalline esters.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d734f9db8efd6422caabbaaacdf5c64
https://doi.org/10.1002/recl.19560751104
https://doi.org/10.1002/recl.19560751104
Publikováno v:
Journal of Pharmaceutical Sciences. 57:1326-1329
The reversible thermal isomerization of calciferols (D) to precalciferols(P), leading to a temperature-dependent equilibrium in solutions, interferes with many chemical and biological analytical procedures for the evaluation of vitamin D products. Tw
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c9a4e37670844cff96fb8c518f04388e
https://doi.org/10.1002/jps.2600570810
https://doi.org/10.1002/jps.2600570810