Now showing items 91-100 of 204
The preparation of (Z)-2-lithio-ortho-styryllithium via an ortho-directed lithiation
(Elsevier, 1993-11-30)
Lithiation of (Z)-2-lithiostyrene with t-butyllithium/TMEDA pentane led directly to (Z)-2-lithio-ortho-styryllithium. Subsequent treatment of this dilithio compound with difunctional electrophiles allowed the preparation ...
Physical properties of a planar magnetron glow discharge
(Elsevier, 1991)
Continued work with a planar magnetron glow discharge plasma device which uses permanent magnets located behind a planar cathode to trap plasma electrons in circular orbits parallel to the cathode surface is described. ...
Evidence for "stable" organocopper intermediates in the reaction between Me2CuLi[middle dot]LiI and allylic sulfinyl mesylates.
(Elsevier, 1992-08-18)
The addition of Me2CuLi[middle dot]LiI to acyclic allylic sulfinyl mesylates bearing a phenyl functionality in the molecule gives rise to chiral allenes 4 and 11 in variable yields and optical purities, presumably via an ...
Silsesquioxanes as models of silica supported catalyst I. [3-(Diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] and [3-mercapto-propyl]-hepta[propyl]-[octasilsesquioxane] as ligands for transition-metal ions * Dedicated to Professor Manfred Weidenbruch on the occasion of his 60th birthday.
(John Wiley & Sons, Ltd., 1999-04)
The ligand [3-(diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] (dpps) can be prepared by reacting [3-chloropropyl]-hepta[propyl]-[octasilsesquioxane] (cs) with KP(Ph) 2 . The transition-metal complexes ...
Direct chemical analysis of UV laser ablation products of organic polymers by using selective ion monitoring mode in gas chromatography/mass spectrometry
(Elsevier, 1994-02)
Trace quantitites of laser ablated organic polymers were analyzed by using commercial capillary column gas chromatography / mass spectrometry; the instrument was modified so that the laser ablation products could be ...
Thermodynamics of ammonium halogenated tellurides I. Heat capacity and thermodynamic properties of (NH4)2 TeCl6 at temperatures from 5 K to 350 K
(Elsevier, 1992-06)
The heat capacity of ammonium hexachlorotellurate (NH4)2TeCl6 was measured at temperatures from 5 K to 350 K. The heat-capacity curve shows a small anomaly around 86 K and a broad peak extending from 100 K to 280 K. The ...
Preparation and reactions of 1,1-zinc, boron and 1,1-copper, boron alkenyl bimetallics
(Elsevier, 1992-06-23)
Pinacol [alpha]-iodoalkenylboronates 8, readily prepared by the hydroboration of 1-iodoalkynes, were converted to 1,1-bimetallics of boron and zinc or copper which react with a wide range of electrophiles affording ...
Synthesis of a pyrido[1,2-a]purine nucleoside by a novel ring cleavage-annulation reaction of 3-[beta]-D-ribofuranosylimidazo-[4,5-d]--triazin-4-one
(Elsevier, 1991-10-07)
Treatment of 7-(2,3,5-tris--(t-butyldimethylsilyl)-[beta]--ribofuranosyl)imidazo[4,5-]-v-triazin-4-one (1) with MnO2 in hot pyridine furnished 7-(2,3,5-tris--(t-butyldimethylsilyl)-[beta]--ribofuranosyl)pyrido[1,2-a]-purine ...
Heat capacity of deuterated cubic ammonium hexafluorosilicate (ND4)2SiF6 from 6 K to 343 K
(Elsevier, 1990-05)
The heat capacity of deuterated cubic ammonium hexafluorosilicate (ND4)2SiF6 was measured from 6 K to 343 K by adiabatic calorimetry. The curve of heat capacity against temperature is smooth and without anomalies. Values ...