PREFACE TO THE 11th GERMAN EDITION

THE moment quantity of the current paintings used to be released in its final variation in 1905 by means of me in collaboration with Professor Georg Schroeter. Dr Schroeter, who had additionally rendered tremendous capable information within the creation of the 7th and succeeding variations, used to be appointed a 12 months in the past to the prestigious place of Professor of Chemistry on the Veterinary collage in Berlin. Collaboration within the guidance of the current moment quantity of the treatise used to be then undertaken via his successor on the Chemical Institute, Dr Hans Meerwein, Assistant teacher in natural Chemistry.

RICHARD ANSCHUTZ.

Since the book of the second one quantity seven years have elapsed, over the last few of which the e-book used to be out of print. during those latter years the quantity of recent subject-matter has gone through a impressive elevate. accordingly, the current quantity, compared to the final version, has needed to be enlarged through greater than 9 sheets, despite the adoption of a bigger measurement of web page, as differently the full personality of the variation might were altered.

As in past variants, a listing of an important interpolations and additions is given below.

Tri-, tetra-, penta-, hepta-, octo-, and nonocyclic compounds. —Special realization is named to the hoop growth via the motion of nitric acid on cyclo-alkyl methylamine as a brand new normal response. The tetra-methylene staff has been supplemented largely through the inclusion of the easiest examples: cyclobutane, cyclobutene, and cyclo-butanone. the best saturated, and unsaturated, carbohydrates, with 8-membered carbon earrings, are acquired via the transformation of pseudo-pelletierin, and feature been very heavily tested. by means of the popularity of the structure of india-rubber as a polymeric dimethyl, cyclo-octadiene, the crowd of octocarbocyclic compounds has received significantly in interest.

The type of nonocarbocyclic compounds has needed to be added.

Single-nucleus fragrant elements. —The ancient account of the idea of the fragrant compounds has been supplemented at crucial issues (p. 28).

Special awareness is directed to the tremendous constant splitting up of benzene and its homologues via the oxidising motion of ozone.

Halogen derivatives of benzene carbohydrates. —Recognition of the truth that the skill for response of aromatically mixed halogens

can be very significantly elevated by way of the addition of finely divided copper or copper salts, has proved of serious useful importance.

Nitrogenous derivatives of benzene carbohydrates. —The guidance of optically energetic dialkyl anilin oxides is important of attention.

The behaviour of nitro-diphenylamines within the formation of salts has been extra heavily tested, and extra passable purposes were given for relating to them as pseudo-acids. As regards new investigations at the diazo-amido-compounds, the coaching of diazo-benzene amide is very vital. New equipment of acquiring diazo-amido-compounds were came upon. the invention of 2 isomeric, in a different way colored, sequence of salts is critical, as regards the structure of amido-azo-compounds, and their salts. cognizance is directed to the creation of tetraphenyl-hydrazin and its attention-grabbing resolving reactions ; see additionally diphenyl-dihydro-phenazin. the method of response within the formation of phenyl-hydrazones, by means of the motion of diazo-benzene salts on aliphatic compounds with simply replaceable hydrogen atoms, has been experimentally elucidated in its person phases.

The team of fragrant compounds of arsenic has attained higher significance, in the course of the discovery of pharmaceutically worthy elements, resembling salvarsan.

Phenols. —The attention of the nitro-phenols as pseudo-acids has won in curiosity by means of the invention of a crimson ester of picric acid. The query of the structure of the oxy-azo-benzenes has been ultimately made up our minds in favour of the azo-formula. Reference can also be ...