PERKINAND KIPPING'SORGANIC CHEMISTRY.F . .%anley Kipping, Professor Emeritus, University College, Nottingham, and F. Barry Kipping, University Lecturer, Cambridge. Third Edition. Thomas Y. Crowell Company, New York City, 1941. xxiii xxvi 1029 pp. 45 figs. 3 charts. 14 X 19.5 cm. $6.00. CHEMI n the third edition of PERKIN AND KIPPING'SORGANIC r s r m the authors have made no radical chanees from the Drevirmr edition either in method of approarh or anangemcnt of material 'They hnvc, however, incorporated I'art Ill with Part* I and I1 in a onc-volume trxt, therrlrv giving to the student not only the fundamentals of organic chemistry but a source for more advanced material. The purpose of the revision is to include the recent developments in organic chemistxy in theoretical interpretations, in new synthetic methods, and in commercial applications. This has been done quite successfullyby modified statements and insertions without involving any great change in the greater part of the text. In Part I the most significant change is the inclusion of the commercial preparations of various aliphatic compounds. These are indicated in the text and summarized a t the end of Part I in two charts giving the products manufactured from "cracked" petroleum, from carbon monoxide, and from acetylene and ethyl alcohol. These charts show the interrelationships of the eompounds and give the page references for the relevant reactions. I n view of the importance of the direct nitration of the paraffins it is surprising that the authors make no mention of this, even in a footnote. I n Part I1 a number of preparative methods have been added; for example, the Clemmensen reduction of aldehyde and ketone for the preparation of the homologs of benzene, the preparation of phenol from chlorobenzene, and diazamethane from the nitroso derivative of methyl urea. The important synthesis of phenanthrene derivatives by the condensation of o-nitrobenzaldehyde (or derivatives) with phenylacetic acid is outlined. A number of important antiseptics such as "Chloramine T" and the acridine derivatives, acriflavine and proflavine, are included. A paragraph on sulfanilamide, its preparation and therapeutic importance, has been introduced. A general but somewhat limited review of the vitamins is given in Part I1 but no mention is made of vitamin Be, of vitamin K, nor of the chemical nature of vitamin E either here or in Part 111. The importance of nicotinic acid is not indicated. The discovery of the metallic phthalacyanines and their use as pigments is indicated but very little emphasis has been given t o plastics and to polymerization processes, which are so significant today. Throughout Part I and Part I1 there are suggestions of the interrelationship of bond "strength" and structure and the structural formulas of a number of compounds have been changed in terms of the electronic theory of valency. This is especially true in the case of a number of nitrogen compounds whose structures include semipolar bands. The distribution of the fourth carbon valencv , in aromatic comoounds is left for discussion in Part 111. I t i, in Part 111 that rlw mo-t markcd dificrmcc betwen this cdirion and the preccdinu m e accurs. T r u nrw
