Now showing items 11-20 of 37
SN2' Substitutions of 1,3-Dichloropropenes with the Functionalized Copper-Zinc Reagents RCu(CN)ZnX
(Elsevier, 1990)
The addition of benzenesulfenyl (or benzeneselenyl) chlorides to propargylic chlorides affords regio- and stereospecifically (E)-1,3-dichloro-2-phenylsulfenyl (or phenylselenyl) propenes (2a-c). These new reagents were ...
Heat capacity of deuterated ammonium tetrafluoroborate ND4BF4 from 7 K to 348 K
(Elsevier, 1990-10)
The heat capacity of deuterated ammonium tetrafluoroborate ND4BF4 was measured from 7 K to 348 K by adiabatic calorimetry. The curve for heat capacity against temperature is smooth with a broad maximum between 120 K and ...
Preparation of functionalized zinc and copper organometallics containing sulfur functionalities at the alpha or gamma position
(Elsevier, 1990)
[alpha]-Chloroalkyl phenyl sulfides 1 readily insert zinc in THF at 25 [deg]C (0.5-2 h), affording sulfur stabilized organozinc derivatives of type 2. The presence of a functional group such as an ester or a cyano group ...
Thermodynamic properties of ammonium haloplatinates I. Heat capacity and thermodynamic functions of ammonium hexachloroplatinate (NH4)2PtCl6 from 6 K to 348 K
(Elsevier, 1990-11)
The heat capacity of ammonium hexachloroplatinate (NH4)2PtCl6 was measured from 6 K to 348 K by adiabatic calorimetry. The heat-capacity curve is sigmate without anomalies. It rises rapidly from T --> 0 to 250 K where ...
Comprehensive force field for multiply-chlorinated hydrocarbons
(Elsevier, 1990)
A force field is presented that has been optimized for chlorinated hyrocarbons containing isolated, vicinal, and geminal secondary chlorines. For carbon--chlorine stretch modes, 74 frequencies in 10 molecules are reproduced ...
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 ...
Synthesis of indolidines by the 1,3-dipolar cycloaddition of azides with methylenecyclopropanes followed by cyclopropyumine rearrangement
(Elsevier, 1990)
Cyclic imines 6a and 6b were obtained by the intramolecular 1,3-dipolar cycloaddition of azides with methylenecyclopropanes. Acid catalyzed rearrangement produced bicyclic (-)-enamines 7, which upon reduction provided ...
The intramolecular cycloaddition of azides with [omega]-chloroalkenes. A facile route to (+/-)-swainsonine and other indolizidine alkaloids
(Elsevier, 1990)
A potentially general route to the 1-azabicyclo[n.m.O]alkane skeleton of various alkaloids is embodied in the intramolecular 1,3-dipolar cycloaddition of aliphatic azides with [omega]-chloroalkenes. Cycloaddition is followed ...
Magnetic-field modulation of a two-electrode direct-current plasma
(Elsevier, 1990)
The magnetic field produced by a pair of electromagnets is used to alter the shape and location of the current channel in a two-electrode direct-current plasma (DCP) designed for solution aerosol analysis. The magnetic ...
Preparation and reactivity of [beta]-zinc and copper phosphonates
(Elsevier, 1990)
Several zinc and copper [beta]-metallated alkylphosphonates of type 2 have been prepared by the insertion of zinc to dialkyl [beta]-bromoalkylphosphonates of type 1. This new class of d2 reagents reacts in excellent yields ...