Author:Meth-Cohn, O; Horak, RM; Fouché, GerdaDate:07 Jun 1994Alpha beta-Epoxy ketones on treatment with baker's yeast yield different types of products depending on their substitution. Small groups such as H or Me attached at the epoxy end protect that end from attack. Thus, 1-acyl epoxides with H, ...Read more
Author:Wellington, Kevin W; Kaye, PT; Watkins, GMDate:2009Series of manganese(II), nickel(II) and zinc(II) complexes have been prepared using 1,10-phenanthroline-derived ligands, and their coordination geometries have been assigned using infrared data. It is apparent that, depending on the ligand, ...Read more
Author:Kotze, FJ; Strydom, CA; Du Plessis, A; Dlamini, TLDate:Mar 2010The direct excitation of CO2 using fast (nanosecond) and ultrafast (femtosecond) pulsed lasers was investigated. A gas reaction cell was used to excite CO2 in a 50 : 50 mixture of CO2 and CH4 using nano- and femtosecond laser systems, to ...Read more
Author:Pelly, SC; Parkinson, CJ; Van Otterlo, WAL; De Koning, CBDate:09 Dec 2005The metathesis reaction is used as a key step for the synthesis of the indolo [2,3-a] carbazole core of rebeccamycin 13 and the sulfur analog of furostifoline 21. Using the same methodology for the attempted synthesis of furostifoline, the ...Read more
Author:Horak, RM; Learmonth, RA; Maharaj, VJDate:27 Feb 1995The preparation of 2-[2H]-l-(p-nitrophenyl)-1,2-epoxyheptan-3-one and its subsequent reduction by baker's yeast to the 2,3-diol is described. The mechanism of the reduction of the epoxide was determined using the B-2H isotope shift in 3C ...Read more
Author:Zeevaart, JG; Parkinson, CJ; De Koning, CBDate:24 May 2004The coupling reaction between ethyl acetoacetate and a number of aryl halides in the presence of palladium acetate, a bulky and electron rich phosphine and K3PO4 is described. The arylated acetoacetate ester is de-acylated under the reaction ...Read more
Author:Zeevaart, JG; Parkinson, CJ; De Koning, CBDate:07 Mar 2005Alpha-Arylation of inethanesulfonamides using palladium catalysis is described. For example, treatment of N-benzyl-Nmethylmethanesulfonamide with catalytic Pd (OAc) (2) in the presence of sodium tert-butoxide, triphenylphosphine and toluene ...Read more
Author:White, D; Taverner, BC; Coville, NJ; Wade, PWDate:14 Jun 1995The values of the solid angles Omega for a range of commonly encountered ligands in organometallic chemistry (phosphines, phosphites, amines, arsines and cyclopentadienyl rings) have been determined. The solid angles were derived from a single ...Read more