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South African Suid-Afrikaanse Journal of Chemistry Tydskrif vir Chemie Volume 44 Volume 44 1991 1991 © Copyright 1991 by the South African Chemical Institute. © Outersreg 1991 deur die Suid-Afrikaanse Chemiese Instituut. All rights reserved. No part of this publication may be reproduced, Alle regte voorbehou. Geen gedeelte van hierdie publikasie mag stored in a retrieval system, or transmitted, in any form or by any sonder skriftelike verlof van die outersreghouer gereproduseer of in means, including electronic, mechanical, photographic, magnetic enige vorm of langs enige elektroniese of meganiese weg weergegee or other means, without the prior written permission of word nie, hetsy deur fotokopiéring, plaat- of bandopname, the copyright holder. mikroverfilming of enige ander stelsel van inligtingsbewaring. Contents Inhoud Infrared diffuse reflectance study of CO chemisorption on supported rhodium catalysts P. Gibson and P.C. van Berge Trimethylamine oxide induced substitution reaction of MM’(CO) jo (M,M’ = Mn, Re). Synthesis and characterization of MM’(CO),L (L = group 15 donor ligands) W.L. Ingham, A.E. Leins, and N.J. Coville Determination of sulphate by flow-injection analysis using a coated tubular solid-state lead ion-selective electrode J.F. van Staden Excess molar enthalpies and excess molar volumes on mixing an aromatic compound with an alcohol at 298,15 K T.M. Letcher, A.K. Prasad, and J. Mercer-Chalmers Polyvinylpyrrolidone-iodine solutions as oxidizing agents in volumetric determinations Reaction between 2-nitrophenol and trichloroacetaldehyde: X-ray crystal structure of 8-nitro- and 8 -nitro-6- methyl-2,4-bis(trichloromethy])-1,3-benzodioxin H.M.N.H. Irving and A. Irving Fragmentation patterns in the mass spectra of 2,3—dihydro-2-phenyl-1,4-benzoxazepin-5 (4H)-ones P.T. Kaye and R.D. Whittal Synthesis of the thionucleoside moiety of albomycin 5, M.W. Bredenkamp, C.W. Holzapfel, and A.D. Swanepoel Total synthesis of swazinecic acid. Part 2. Synthesis of a spirodilactone J.R. Liddell and C.G. Whiteley X-Ray diffraction analysis of the ammonium nitrate IV — III -II and IV —II phase changes under controlled humidity conditions J.C.A. Boeyens, E. Ferg, D.C. Levendis, and F.R.L. Schéning An electrochemical investigation of the effect of nickel and ruthenium on the dissolution of a high chromium super-ferritic stainless steel in reducing acid media J.H. Potgieter and M.U. Kincer Cobalt salts in nonane oxidation with dioxygen A. Goosen, C.W. McCleland, and J.S. O’Connell A mass spectrometric study of 2,3-dihydro-2-phenyl-4 H-tetrazolo[1,5-d]-1,4-benzoxazepines P.T. Kaye and R.D. Whittal Synthesis of symmetrical diaryl selenones and their characterization by mass spectrometry T.E. Tyobeka and P.W. Rasmussen A molecular mechanics study of crystalline dodecahedrane J.L.M. Dillen Structure and stability of some complexes of lariat ethers with sterically-hindered pyridyl groups as pendent donors K.V. Damu, R.D. Hancock, J.C.A. Boeyens, D.G. Billing, and S.M. Dobson Photolysis of N-halocarbamates : alkene addition reactions J.P. Gerber and A. Goosen Crystallographic study of N-arylpyrrolidin-2-ones D.G. Billing, J.C.A. Boeyens, D.C. Levendis, and J.P. Michael Diterpenoids of Leonotis species. Part 8. The crystal structure and absolute stereochemistry of saponified dubiin M.T. Davies-Coleman, R.B. English, and D.E.A. Rivett Synthesis of the naturally occurring naphthoquinone aristolindiquinone M.E. Botha, R.G.F. Giles, S.C. Yorke, and I.R. Green Influence of bridgehead functionality on reactions of 14a,17a-etheno-19-norsteroids J.R. Bull and R.I. Thomson Trichloroacetylisocyanate: rapid in situ determination of diastereomeric ratios of alcohols by 'H n.m.r. spectroscopy G.H.P. Roos and M.C. Watson Preparation of cyclic thionocarbonates of carbohydrates: new light on the regioselective tin activation of polyols M.W. Bredenkamp, C.W. Holzapfel, and F. Toerien Oxidation kinetics of a Fischer-Tropsch wax. Part 2. Induction period as first macroscopic process stage E.L.J. Breet and A.S. Luyt Ion chromatographic separation of Cr™ and Cr’ and spectrophotometric detection of Cr™ -EDTA and Cr“ DPC species H. de Beer and P.P. Coetzee Studies on the chelation of aluminium for biological application Part 3. Méaltol G.E. Jackson and C.B. Steyn Compensation effects in ligand-substitution reactions of aquacobalamin H.M. Marques (Liquid—liquid) equilibria for mixtures of an alkanol + water + cyclohexane at 298,2 K T.M. Letcher, P. Siswana, and S.E. Radloff Synthesis of formaldehyde bis (pentaerythritol) acetal (BPMF) R. Hunter and C.D. Simon Empirical energy parameters for the ionic halides G. Brink, L. Glasser, and A. 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