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1-Alkyl--1-Phenylhydraz Ines: Their Synthesis And

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1-Alkyl--1-Phenylhydraz Ines: Their Synthesis And 1-ALKYL--1-PHENYLHYDRAZ INES: THEIR SYNTHESIS AND OXIDATIVE REARRANGEMENT LACELAN MACLEAN B.Sc. Ph.D. Chemistry UNIVERSITY OF EDINBURGH 1977 To Irod parents ACKNOWLEDGEMENTS I would like to express my gratitude to Dr. A.J. Bellamy for his advice, encouragement. and assistance throughout the duration of this study. I also thank the staff and fellow students of the Chemistry Department for their general helpfulness: in particular Dr. E. Stefaniuk and Mr. C.D. Anderson for supplying samples of 2-forxnylstilbene and pent-3-en-2--one respectively, and Mrs. J. Gorrie for her care in typing this thesis. Finally, I thank the Science Research Council for financial support. L.M. I have composed this thesis which describes my own work. Where the work of other authors is referred to, this is clearly indicated. ABSTRACT OF THESIS Some historical aspects of the oxidation reactions of 1,1-disub- stituted hydrazines are reviewed. In particular, the evidence for the proposed intermediacy of diazenes in these reactions is outlined and the nature of the oxidation products is considered in the broader context of diazene-generating reactions. The synthesis of l-alkyl-l-phenylhydrazines has been examined and several preparative procedures are discussed. The alkylation of the sodium salt of phenyihydrazine with the appropriate alkyl halides was found to be the most successful method; the hydrazines prepared in this way all had substituents of the allylic type. Purification (to remove residual phenyihydrazine) can be achieved by selective recrystallisation of the hydrochloride derivative from benzene. Some limitations of this general method are described. The oxidation studies were carried out using lead tetra-acetate and mercuric oxide. The oxidative rearrangement of l-allyl--l--phenyl- hydrazine to 1-phenylazoprop-2-ene was confirmed, and by regarding this as the model system, formation of particular species from the other hydrazines was envisaged. The outcome of each oxidation study is discussed in detail. The oxidation of 1-(pent-3-en-2-yl)-l-phenylhydrazine was studied in the context of a proposed method of examining the base-catalysed rearrangement of an optically active azo-compound (formed in the oxidative rearrangement of the optically active hydrazine). Preliminary studies on the racemic hydrazine indicate that the azo- compound is obtained in the form of two geometrical isomers. The synthesis of 1-phenylazoprop-2-ene by an unambiguous route is described; the method should have wider potential. A proposed method of determining the electronic character of the diazene involved in the oxidative rearrangement of allylic hydrazines, and difficulties encountered in its application are described. The attempted interception of the intermediate diazenes by dimethyl suiphoxide and dimethyl sulphide is described. Oxidation of the hydrazines with cupric chloride was found to give copper-containing solids whose exact composition could not be determined. CONTENTS Page INTRODUCTION 1 - DISCUSSION - 18 (The following items are listed for convenient reference) Preparation of l-Alkyl-1-Phenylhydrazines 18 The Oxidation of l-Alkyl-l--Phenylhydrazines; . 37 1-Allyl-l-Phenylhydrazine . 43 1-Cyclopropylcarbinyl-l-Phenylhydrazine .. . 44 1- (But-3-en-l-yl) -1-Phenyihydrazine . 47: . 1-Benzyl-1-Phenylhydrazine . 50 1- (2-Styrylphenylmethyl) -1-Phenyihydrazine 52 1- (3-Phenylprop-2-ynyl) -1-Phenyihydrazine 54 Preparation of 1-Phenylazoprop- 2- erie 58 The and 13C N.m.r. Spectra of 1,2-Diformyl-l- 63 Phenylhydrazine and 2-Formyl-1-Phenylhydrazine The Preparation and Oxidative Rearrangement of 1-(Perit-3- •67 en-2-yi) -1-Phenyihydrazine: Preparation 69 Oxidative Rearrangement 74 Attempted Characterisation of the Oxidation Products 75 Preliminary Investigation into a Method for Determining 96 the Electronic Character of the Diazene Involved in the Oxidative Rearrangement of Allylic Hydrazines The Attempted Interception of l-Alkyl-l-Phenyldiazenes by 105 Dimethyl Suiphoxide and by Dimethyl Sulphide The Attempted Preparation of Copper(I) Complexes of 109 1-Alkyl-1-Phenyldia zenes EXPERIMENTAL 119 BIBLIOGRAPHY -1- INTRODUCTION The oxidation of 1-alkyl-l--phenylhydrazines was first studied towards the end of the nineteenth century. In 1878 Fischer reported the preparation of phenyihydrazine and several of its derivatives. 1 In that same paper, he described the oxidation of 1-rnethyl-1-phenyl- hydrazine and 1,1-diphenyihydrazine with yellow mercuric oxide to give products which he suggested were 1, 4-dimethyl-1, 4-diphenyltetraz-2-ene and 1,1,4,4-tetraphenyltetraz--2-ene respectively (Scheme 1). Later work by Fischer and Troschke 2and by Renouf 3 confirmed that tetrasubstituted tetraz-2-enes were formed when such hydrazines were oxidised with mercuric oxide. In the light of these results, tetrazene formation came to be regarded as the 'normal' reaction pathway in the mercuric oxide oxidation of 1,1-disubstituted hydrazines. However,it soon became apparent that this was not the only possible pathway. In 1893 Michaelis and Luxernburg 4 found that the oxidation of 1-allyl-1- pheny1hydrazine and 1-allyl-1-7tolylhydrazine with yellow mercuric oxide gave azo-compounds and not the expected tetrazenes. They suggested that the azo-compounds were formed by the rearrangement of an intermediate species (1) having a nitrogen atom bound only to another nitrogen atom (Scheme 2) The same reaction had, in fact, been carried out unwittingly by Fischer and Knoevenagel 5 some years before. A further anomalous oxidation pathway in the oxidation of 1,1-disub- stituted hydrazines was discovered by Busch and Weiss 6 in 1900. These authors observed that mercuric oxide oxidation of 1,1-dibenzylhydrazine gave bibenzyl with concomitant evolution of nitrogen (Scheme 3). The reaction proceeds smoothly and has come to be known as the Busch-Weiss reaction. Ph\ _ Ph \ Ph 2 N NH2 ----101, "N NN N" -4H R" .\R R= Me., Ph Scheme 1 __ C3H5\ C3H5\ HgO NH 2 - * N (1) .R/ R / R= Ph, p-C6H4CH3 CP~T— N—N R Scheme 2 PhCH 2\ HO N — NH 2 -k PhCH2CH2Ph PhCH / Scheme 3 C3H5\ R R= Ph, p-05H4CH3 (2) -2- Another anomalous oxidation was reported by Busch and Lang in 1936; they found that the oxidation of l-benzyl-l-phenylhydrazines, with substituents in either or both aromatic rings, using mercuric oxides gave aryihydrazones. or mixtures of aryihydrazones and the expected tetra- zenes. (Scheme 4). Since that time the oxidation of 1,1-disubstituted hydrazines has been extensively studiedandà widevariety of oxidising agents has been used.. The most frequently used oxidant is probably mercuric oxide, possibly because of the mildness of the conditions involved and the ease of recovery of the oxidation product.More recently, lead tetra-acetate has become a widely used oxidising agent. Several authors have carried out the oxidation using halogens or alkali metal halates in acidic aqueous solutions. Among the less common oxidising agents used are activated manganese dioxide, nickel dioxide, selenium dioxide, potassium permanganate, N-bromosuccinimide, chlorine, quinone, t-butyl hypochiorite, per-acids and thE diethyl ester of azodicarboxylic acid. As a result of this extensive examination, it became apparent that both the 'normal' and the 'anomalous' oxidation pathways unearthed by the early workers (vide supra), were characteristic of the oxidation of 1, 1-di substituted hydrazines as a class, and that the same results could be achieved using oxidising agents other than mercuric oxide. Until the 1950's, the anomalous oxidations remained relatively unexplored, and little was known of their mechanisms. Although Michaelis and Luxemburg4 had proposed an intermediate species (1) to explain the formation of azo-compounds, and Busch and Lang and Kenner and Knight had postulated the essentially analogous species (2) to account for the formation of phenylhydrazones and bibenzyls respectively, no firm evidence N N R (3) R\ __ H,Br2 NH2 NH R/N -2HBr R" .4-4> R/ H+ ~ /N-N N-N CH31C2H5 Scheme 5 (PhCH 2)2N NHSO 2Ph OH - IF (PhCH2) 2N NS02Ph PhCH2\ PhCH " 17 PhCH2CH2Ph -3- was available to support their existence. In the latter half of the decade, detailed examinations of both existing known reactions, and some new reactions broadly in the field of hydrazine chemistry, supplied a considerable body of evidence in support of the intermediacy of 1,1- diazenes in these reactions. The similarity of the 1,1 -diazene (3) to the originally proposed intermediates, (i) and C21, is obvious. The most fundamental evidence came from the work of McBride and 9,10 his co-workers and carpino) McBride and Kruse 9 prepared solutions of 1,1-dialkyldiazenium salts from the oxidation of 1,1-dialkyihydrazines by halogens and by alkali metal halates in strongly acidic media (Scheme 5); they were able to show that two equivalents of oxidant were consumed. Treatment of these solutions with stannous chloride reduced the dialkyl- diazenium ions quantitatively to the starting hydrazines, while careful neutralisation of the solutions at low temperature, by the addition of aqueous sodium hydroxide solution gave nearly theoretical yields of the tetra-alkyltetrazenes. The tetrazenes were shown not to be present in protonated form prior to neutralisation by the absence of the character- istic ultraviolet absorption of tetrazenium salts and by the observation that the latter salts were resistant to reduction by stannous chloride; an ultraviolet absorption characteristic of the diazenium salts was observed. McBride and.Bens 1° also found that mixtures with a statistical distribution of all possible tetrazenes resulted from the neutralisation of solutions containing a number of different diazeniuju ions. Related to the work of McBride and Kxuse9 was the study of the electrochemical oxidation of 1,1-dimethyihydrazine and 1,1-diphenyl- 12 hydrazine in acid solutions, by King and Bard and by Cauquis and Genies 13,14 respectively. This study confirmed the formation of relatively stable -4-. species by a two-electron oxidation, the presence of these species being demonstrated by coulometrY, chronopotentiOmetrY and ultraviolet spectros- àopy.
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