butane-1,3-dicarboxamide;1,1,5,5-tetrakis(dimethy lamino)-1,4pentadiene (VIII) from , , ',N'-tetramethylglutaramide; and 2,2-difluorovinylidenebis(dimethylamine) (XX) from difluoroacetic acid. 2,5-Bis(dimethylamino)-2,4-hexadiene (V) was prepared by the Ti(NMe2)4 method from 2,5-hexanedione as a liquid, bp 79°(1.5 Torr) (it solidifies near 0°). It exhibits an nmr spectrum consisting of singlets at r 4.8 (2 H), 7.4 (12 H), and 8.2 (6 H). Its mass spectrum includes a parent ion at m/e 168; an + 1 peak equal to 12.1 % of M+ (expected for CioH2oN2: 11.9%); and fragment ions corresponding to [M -(CH3)2NH]+ and [M -(CH3)2NHCH3]+, reasonable fragments for this structure.2,3-Bis(dimethylamino)butadiene (XVIII) and 1-dimethylaminostyrene (XXI) were prepared by the TiCl4-HNMe2 method of White and Weingarten27•81 from 2,3-butanedione and acetophenone, respectively. The preparation of l-methyl-3-dimethylamino-2 butenylidenedimethylammonium fluoroborate (XXII) will be described elsewhere.20
treated fully in four of the chapters. Literature references are given in great detail.The physical make-up of the book is excellent.It has been a great pleasure and a privilege to the writer to have had the opportunity of reviewing this splendid treatise.
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