The present volume continues the aim of Structure Reports to present critical accounts of all crystallographic structure determinations. Details of the arrangement in the volumes, symbols used etc. are given in previous volumes (e. g. 41B or 42A, pages vi-viii). University of Guelph, G. FERGUSON Guelph, Ontario, Canada 30 April 1983 [VI] STRUCTURE REPORTS SECTION BI ORGANIC COMPOUNDS Editedby J. Iball (University of Dundee) with the assistance 0/ J. C. Barnes G. Ferguson C. H. Morgan S. N. Scrimgeour T. J. R. Weakley B. C. Williams D. W. Young [1] 2 ARRANGEMENT To find a particular organic or organometallic compound the subject index or formula index at the end of Part 2 of this Volume should be used. The general arrangement is: aliphatic or open-chain compounds; open chains with N, S; benzene derivatives; cyclic hydrocarbons; condensed ring systems; heterocyclic compounds; carbohydrates; amino acids; natural products; molecular complexes; organometallic compounds - B, Si, P, As, Sb, groups IA, IIA, 111, IV, VI; transition metal complexes - ~-complexes, other ligands. Only complete structure analyses are described, and those which have been reported in preliminary communications and for which details will appear at a later date, have not been described here. 3 ALIPHATIC CARBOXYLIC ACID DERIVATIVES TRIFLUOROACETIC ACID (at 83 K) C HF 0 CF COOH 2 3 2 3 I. NAHRINGBAUER, J. -O. LUNDGREN and E. K. ANDERSEN, 1979. Acta Cryst. , B35, 508-510.