Syntheses for the deconvolution of the Patterson function. V. Test of the various syntheses for centrosymmetric crystals

Abstract

This paper gives an account of the results of testing out the various types of syntheses (the α, β and γ classes in their general and modified forms) which were proposed earlier for the deconvolution of the Patterson function when a part of the structure is known. The tests have been carried out on the centrosymmetric projections of the structures L-tyrosine hydrochloride, L-tyrosine hydrobromide and L-cystine dihydrobromide. As expected from theory, all the syntheses reveal the unknown part of the structure. However, it is rather difficult to decide from the present tests as to which of these is the best. A modified form of the phase synthesis has also been tested and, as expected from theory, it resembles closely the Fourier synthesis.