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The present volume continues the aim of Structure Reports to present critical accounts of all crystallographic structure determip. ations. The increase in the number of crystal structure papers (now about 2000 per year in the Organic Section) has prompted a minor change in format, which increases the information density per page, hopefully without any loss of clarity. Details of the arrangement in the volumes, symbols used etc. are given in previous volumes (e. g. 41 B or 42A, pages vi-viii). J. TROTTER University of British Columbia Vancouver, Canada 14 September 1978 [VI] STRUCTURE REPORTS SECTION III ORGANIC COMPOUNDS Edited by G. Ferguson with the assistance of M. Currie D. F. Rendle J. Iball S. J. Rettig A. L. Macdonald S. N. Scrimgeour W. C. Marsh J. C. Speakman M. Napier ARRANGEMENT To find a particular organic compound the subject index or the formula index 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 lA, IIA, III, IV, VI; transition metal complexes - w-complexes, other ligands. Only com­ plete structure analyses are described; compounds for which only lattice para­ meters are determined, and those which have been described only in preliminary communications and for which details will appear at a later date, have not been reported.

In the past the aim of Structure Reports has been to present critical reports on all work of crystallographic structural interest, whether it is derived directly from X-ray, electron, or neutron diffraction, or even indirectly from other experiments. The reports were in­ tended to be critical and not mere abstracts, except in some cases when a brief indication of the content of a paper of related interest was included in the form of an abstract. In selecting topics for reporting, the criterion 'of structural interest' was freely interpreted in terms of what was topically interesting. However, the amount of Iiterature covering matters of structural interest became so large that this policy could no Ionger be followed, and from Volume 28 onwards, critical reports are given only on actual structure deter­ minations. Only in this way was it possible to keep yearly volumes to a fairly uniform and usable size. Starting with Volume 30, Structure Reports is produced in a new format by photo-offset printing from typed manuscript with unjustified lines. At the time when the decision for this change was taken, the cost of setting the manuscript in type was becoming so high as to render the cost of individual subscription prohibitive. At that time automatic typing methods giving justified lines, etc.

In the past the aim of Structure Reports has been to present critical reports on all work of crystallographic structural interest, whether it is derived directly from X-ray, electron, or neutron diffraction, or even indirectly from other experiments. The reports were in­ tended to be critical and not mere abstracts, except in some cases when a brief indication of the content of a paper of related interest was included in the form of an abstract. In selecting topics for reporting, the criterion 'of structural interest' was freely interpreted in terms of what was topically interesting. However, the amount of literature covering matters of structural interest became so large that this policy could no longer be followed, and from Volume 28 onwards, critical reports are given only on actual structure deter­ minations. Only in this way was it possible to keep yearly volumes to a fairly uniform and usable size. Starting with Volume 30, Structure Reports is produced in a new format by photo-offset printing from typed manuscript with unjustified lines. At the time when the decision for this change was taken, the cost of setting the manuscript in type was becoming so high as to render the cost of individual subscription prohibitive. At that time automatic typing methods giving justified lines, etc.

Starting with Volume 30, 1965, Structure Reports is produced in a new format by photo-offset printing from typed manuscript with unjustified lines. At the time when the decision for this change was taken, the cost of setting the manuscript in type was becoming so high as to render the cost of individual subscription pro­ hibitive. At that time automatic typing methods giving justified lines, etc. for photo-offset reproduction did not offer any saving over type setting, but hand typing of the manuscripts could give a considerable saving in production costs. In the belief that a publication that is too expensive to buy is of little value, the format has been changed sacrificing elegance to availability. The new format does not lead to increased length of the volumes since the information content of the typed and typeset pages is practically identical. How­ ever, the amount of work to be reported demands the eventual separation of Structure Reports into two volumes, A. Metals and I norganic and B. Organic. It was convenient to introduce this changealso at Volume 30, and with Volume 31 further to restriet the publication of crystal data, so that from 1966 onwards the reports deal almost entirely with complete structure determinations only. In the past the aim of Structure Reports has been to present critical reports on a1l work of crystallographic structural interest, whether it is derived directly from X-ray, electron or neutron diffraction, or even indirectly from other experiments.

The present volume continues the aim of Structure Reports to present critical ac­ counts 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 18 January 1986 [VI] STRUCTURE REPORTS SECTION III ORGANIC COMPOUNDS Edited by S. N. Scrimgeour with the assistance of J. C. Barnes G. Ferguson J. lball C. H. Morgan T. J. R. Weakley B. C. Williams C. C. Wilson 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 lA, IIA, Ill, IV, VI; transition metal complexes - ~-complexes, other ligands; inorganic anions which have orp,anic counter ions. 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 BROMOFLUOROACETIC ACID C H BrF0 2 2 2 R. D. ROGERS, B. KALYANARAMAN, M. S. DALTON, W. SMITH, L. D. KISPERT and J. L. ATWOOD, 1981. J. Cryst. Mol. Struct. , ll, 105-111.

The present volume continues the aim of Structure Reports to present critical accounts of all crystallographic structure determinations. Details of the arrange­ ment in the volumes, symbols used etc. are given in previous volumes (e. g. 41B or 42A, pages vi-viü). University of Guelph, G. FERGUSON Guelph, Ontario, Canada 1 May, 1993 STR UCTURE REPORTS for 1985 Volume52B Part2 STRUCTURE REPORTS for 1985 Valurne 52B (Part 2) ORGANIC SECTION General editor G. Ferguson Section editor G. Ferguson Published for the INTERNATIONAL UNION OF CRYSTALLOGRAPHY SPRINGER-SCIENCE+BUSINESS MEDIA, B. V. TABLE OF CONTENTS Introduction, VI Transition-metal Compounds (continued), 1103 Subject Index, 1902 Permuted Subject Index, 1993 Formula Index, 2053 Permuted Formula Index, 2078 Author Index, 2102 STRUCTURE REPORTS SECTIONID ORGANIC COMPOUNDS Edited by G. Ferguson with the assistance of C. H. Morgan D. F. Rendie S. J. Rettig S. N. Scrimgeour T. J. R. Weakley C. C. Wilson D. W. Young 2 ARRANGEMENT To find a particular organic or organometallic compound consult one of the indices (subject, permuted subject, formula or permuted formula) at the end of Part 2 of this volume. The general arrangement follows the classification used in the Cambridge Crystallographic Data Base and is: aliphatic or open chain compounds; open chains with N, S; benzene derivatives; c cyclic hydrocarbons; condensed ring systems; heterocyclic compounds; carbohydrates; amino acids; natural products; molecular complexes; organometallic compounds - B, Si, P, AJJ, Sb, groups lA, IIA, III, IV, VI; transition meta! complexes - . .

The format of information in individual reports is: names, formulae, papers reported, unit cell and space group data, details of analysis, atomic positions, inter-atomic distances and angles, description and discussion of the structure (with diagrams), and additional references.

In the past the aim of Structure Reports has been to present critical reports on all work of crystallographic structural interest, whether it is derived directly from X-ray, electron, or neutron diffraction, or even indirectly from other experiments. The reports were in- tended to be critical and not mere abstracts, except in some cases when a brief indication of the content of a paper of related interest was included in the form of an abstract. In selecting topics for reporting, the criterion 'of structural interest' was freely interpreted in terms of what was topically interesting. However, the amount of Iiterature covering matters of structural interest became so large that this policy could no Ionger be followed, and from Volume 28 onwards, critical reports are given only on actual structure deter- minations. Only in this way was it possible to keep yearly volumes to a fairly uniform and usable size. Starting with Volume 30, Structure Reports is produced in a new format by photo-offset printing from typed manuscript with unjustified lines. At the time when the decision for this change was taken, the cost of setting the manuscript in type was becoming so high as to render the cost of individual subscription prohibitive. At that time automatic typing methods giving justified lines, etc.

This cumulative index of "Structure Reports" contains all the structures for the years 1913-1980 (Volumes 1 to 46B) and the authors for the latest 10-year period, 1971-1980 (Volumes 37B-46B).

The format of information in individual reports is: names, formulae, papers reported, unit cell and space group data, details of analysis, atomic positions, inter-atomic distances and angles, description and discussion of the structure (with diagrams), and additional references.

TABLE OF CONTENTS Introduction, VI Main-group Compounds (continued), 833 Transition-metal Compounds, 904 Subject Index, 1687 Formula Index, 1774 Author Index, 1806 [V} STRUCTURE REPORTS SECTION III ORGANIC COMPOUNDS Edited by G.

This cumulative index of structure reports contains all the structures for the years 1913-1980 (Volumes 1 to 46B) and the authors for the latest 10-year period 1971-1980 (Volumes 37B-46B).

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. 3 ALIPHATIC CARBOXYLIC ACID DERIVATIVES BROMOFLUOROACETIC ACID C H BrF0 2 2 2 R.

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. 3 ALIPHATIC CARBOXYLIC ACID DERIVATIVES TRIFLUOROACETIC ACID (at 83 K) C HF 0 CF COOH 2 3 2 3 I.

Starting with Volume 30, 1965, Structure Reports is produced in a new format by photo-offset printing from typed manuscript with unjustified lines.

In the past the aim of Structure Reports has been to present critical reports on all work of crystallographic structural interest, whether it is derived directly from X-ray, electron, or neutron diffraction, or even indirectly from other experiments.