0000000000231085

AUTHOR

Johann Mathias

showing 3 related works from this author

ELEKTROREDUKTIVE DIREKTDARSTELLUNG VON Ni(O)-, Pd(O)- UND Rh(O)-PHOSPHIN-KOMPLEXEN1

1981

Abstract 1. Der Ni(O)-Komplex [Ni(PC2P)2] 1 mit zwei Ethylen-1,2-bis (diphenylphosphin)-Partnern (PC2P) als Ligand wird elektroreduktiv erhalten: (a) aus [Ni(PC2P)2Br2]; (b) aus [Ni(PC2P)Br2] + PC2P; (c) aus NiBr2 · 3H2O + 2PC2P. Die Ausbeuten liegen uber 90%. Nach Verfahren (b) entstehen auch Komplexe mit zwei unterschiedlichen Liganden, z.B. [Ni(PC2P) (PPh3)2] 4 [Ni(PC2P)(PC3P)] 5, [Ni(PC2P)(AsPh3)2], wenn man an Stelle von PC2P. PPh3. PC3P und AsPh3 einsetzt. (PC3P entspricht Trismethylen-1.3-bis (diphenylphosphin). Nach dem Direktverfahren, (c) ist Tetrakis(triphenylphosphinnickel(O) [Ni(PPh3)4] 6 in einer Ausbeute von 77% zuganglich. 2. [PD(PC2P)2] 7 entsteht elektroreduktiv nach Verfa…

ChemistryMedicinal chemistryPhosphorus and Sulfur and the Related Elements
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Chemoselektive mono- und disilyletherbildung aus tertiären und sekundären silanen

1985

Abstract Tertiary and secondary silanes are O-selective. With alcohols the corresponding silyl ethers are formed. Cesium fluoride/imidazole (CsF/Im) is a better activating system than CsF alone. Primary OH groups are silylated remarkably faster under CsF/Im activation than secondary OH groups. Tertiary alcohols do not react. Primary OH groups are selectively protected also in the presence of secondary OH groups by silanes with bulky ligands such as triisopropylsilane ((i-Pr) 3 SiH ( 4 )). Ketones are neither reduced to silyl ethers nor transformed to silylenol ethers under the conditions employed. Secondary silanes form monosilyl ethers by amine activation; with CsF the formation of disilyl…

SilanesSilylationOrganic ChemistryCyclohexanolAlcoholBiochemistryMedicinal chemistryInorganic Chemistrychemistry.chemical_compoundchemistryMaterials ChemistryImidazoleOrganic chemistryAmine gas treatingMethanolPhysical and Theoretical ChemistrySelectivityJournal of Organometallic Chemistry
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Fluoreszierende silane als OH-selektive schutzgruppen

1985

Abstract Fluorescent tertiary silanes are synthesized which, under cesium fluoride/ imidazole activation, discriminate between primary and secondary OH groups. Serine n-butylamide reacts with [5-dimethylamino(1-naphthyl)]dimethylsilane ( 1 ) and diisopropyl[5-dimethylamino(1-naphthyl)]silane ( 2 ) to form the silyl ethers (−)- l -3-[5-dimethylamino(1-naphthyl)]-dimethylsilyloxy]serine n-butylamid ( 14 ) and (−)- l -3-[diisopropyl[5-dimethylamino(1-naphthyl)]silyloxy]serine n-butylamid ( 15 ) exclusively. The silyl ethers are cleaved on treatment with H 2 F 2 , forming the corresponding fluorescent silyl fluorides. Absorption and fluorescence data as well as stability data for the hydrolysis…

SilanesDimethylsilaneSilylationChemistrymedicine.drug_classStereochemistryOrganic ChemistryCarboxamideBiochemistryMedicinal chemistryInorganic Chemistrychemistry.chemical_compoundpolycyclic compoundsMaterials ChemistrymedicineImidazolePhysical and Theoretical ChemistryProtecting groupAliphatic compoundFluorideJournal of Organometallic Chemistry
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