Amines As Dehalogenating Agents, IQ1 the Fate of N,N-Dimethylaniline in the Reductive Dehalogenation of 3-Bromocamphor
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Amines as Dehalogenating Agents, IQ1 The Fate of N,N-Dimethylaniline in the Reductive Dehalogenation of 3-Bromocamphor A n g e l o G . G i u m a n i n i * a n d M a r c o M . M u s i a n i Istituto Chimico G. Ciamician and Centro di Gascromatografia-Spettrometria di Massa, University di Bologna, 40126 Bologna, Italy (Z. Naturforsch. 32 b, 1314-1324 [1977]; received June 6, 1977) Debromination, 3-Bromocamphor, N,N-Dimethylaniline, Aniline A product analysis was made for the reaction between some aromatic amines and 3-bromocamphor (2), which was invariably transformed into camphor (3) and eventually aryliminocamphor. The tertiary N,N-dimethylanilines were oxidized through a complex sequence of couplings and rearrangements to a number of diamines of the diphenyl- methane type. Aniline (4) was also successful in the reductive debromination of 2 to 3 and camphor anil (7), but gave only tarry amino compounds. The reaction, carried out at 200 °C, appeared most probably to be triggered by the radicalic dissociation of the C-Br bond. Bromine ended up as bromide ion in quantitative fashion. We have reported the reductive debromination would not be eluted by gas chromatography was of certain a-bromo and a,a-dibromo carbonyl demonstrated by vacuum distillation (0.1 torr) of derivatives, namely ketones2 and esters1 to the the amines mixture which left practically no residue corresponding ketones and esters by the action of (max. temp. 200 °C), although typical pH depending hot N,N-dimethylaniline (1). The fate of bromine colors showed the presence of traces of high molecu and the amine was not then investigated and is the lar weight dyes. object of the present work. The more volatile components included aniline (4), N-methylaniline (5), p-bromo-N,N-dimethyl- Results aniline (6) and camphor anil (7). All the higher We have used 3-bromocamphor (2) as the model boiling components showed a dimeric framework, compound, because its reaction with 1 is remarkably namely, that of variously N,N'-polymethylated o- clean, giving camphor (3) in high yield. A standard and p-diaminodiphenylmethanes (DDM’s). They acid base separation allowed to isolate a mixture of are: N,N'-dimethyl-o,o'-DDM (8), N,N'-dimethyl- all basic nitrogen containing compounds. Bromide 2?,p'-DDM (9), N,N,N'-trimethyl-o,p'-DDM (10), ion was found in practically quantitative conver N^'.N'-trimethyl-o^'-DDM (11), N,N,N'-trime- sions in the resulting water solution for longer thyl- 2?,p'-DDM (12), N ^N 'jN '-tetram ethyl-o,^'- reaction times (see Table I). At least eleven products DDM (13) and N^N'.N'-tetramethyl-^p'-DDM could be separated by gas chromatography using (14). The mass spectrum of the GC peak with reten suitable combinations of stationary phases and tion time ratio 0.57 with respect to 14 in the further identified by mass spectrometry (Table II), analysis with SE 30 as stationary phase and the used both as a preliminary tool for structure mass spectrum of the GC peak with retention time determination and as a fingerprinting method for ratio 1.00 in the analysis with Versamide, respec comparison with compounds obtained by different tively belonging mainly to 11 and 14, showed the routes. The relative quantitative unimportance of presence of the molecular ion of another N,N'-poly- products of such extremely high boiling points, that methylated-DDM, i.e., N,N'-dimethyl-o,j9'-DDM (15). This compound was prepared by an independ Requests for reprints should be sent to Prof. Dr. ent route and found to have the same GC properties; A. G . G i u m a n i n i , Istituto Chimico G . Ciamician and it showed the same mass spectrum as the one Centro di Gascromatografia-Spettrometria di Massa, Universitd di Bologna, 1-40126 Bologna. reconstructed for the hidden peak. Camphor anil Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung This work has been digitalized and published in 2013 by Verlag Zeitschrift in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der für Naturforschung in cooperation with the Max Planck Society for the Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Advancement of Science under a Creative Commons Attribution Creative Commons Namensnennung 4.0 Lizenz. 4.0 International License. A. G. Giumanini-M. M. Musiani • Amines as Dehalogenating Agents 1315 Table I. Products of the reaction between 3-bromocamphor (2) and aromatic amines*. Amine Time Products [%] [h] B r- Camphor Nitrogen containing compounds N,N-Dimethylaniline (1) 3 29 33 b N,N-Dimethylaniline (1) 8 47 50 Aniline (4, 1) N,Methylaniline (5, 87) p-Bromo-N,N-dimethylaniline ( 6 , 0.5) Camphor anil (7, 1) N,N'-Dimethyl-o,o'-DDM ( 8 1) N.N'-Dimethyl-p.p'-DDM (9, 2) N,N,N'-Trimethyl-o,p'-DDM (10, 1) N,N'N,-Trimethyl-o,p'-DDM (11, 9) N,N,N'-Trimethyl-p,p'-DDM (12, 7) N,N,N',N'-Tetramethyl-o,p'-DDM (13, 3) NjN.N'^'-Tetramethyl-p.p'-DDM (14, 29) N,N'-Dimethyl-o,p'-DDM (15)c N,N-Dimethylaniline (1) 32 1 0 0 76 b N,N-Dimethylaniline (1) and 18 3 c 19 b Aniline (4) 24 98 7 Camphor anil (7, 87) N,N-Diphenylamine (28, 9)d p-Toluidine (22) 24 c 26 Aniline (4, 3)d Camphor anil (7, 1) Camphor p-methylanil (23, 51) N,N-Di-p-tolylamine (42, 3)d N-Phenyl-p-toluidine (43, 0.5)d N,N-Dimethyl-p-toluidine (34) 8 c 58 2,2/-Di(N-methyl-4-toluidino)methane (35, 17) N,N,N'-Trimethyl-2,2'-di(4-toluidino)methane (36, 20) 2,2'-Di(N,N-dimethyl-4-toluidino)methane (37, 5) None 3 c 7 8 1.5 c a Temperature of the thermostatic external bath: 200 °C ± 3 °C. The amine/2 weight ratio was 5:1. b Yields not determined, same qualitative product pattern as in analogous experiments. c Yield not determined. d Yield based on initial amine. Table II. GC-MS data of DDM’s (8-15) from reaction* of 3-bromocamphor (2) and N,N-dimethylaniline (1). DDM GC Rentention ratios 15 Mass spectrometry at 70 eY, m/e (% rel. int . ) 0 Versamide SE 30 N,N'-Dimethyl-o,o'-DDM 0.61 0.35 226 (M+, 100), 120 (67), 107 (56), 118 (50), 106 (40), (8) 91 (35), 194 (26), 227 (19), 180 (18), 119 (16). NjN'-Dimethyl-p.p'-DDM 0 1.98 0 . 8 8 226 (M+, 100), 225 (75), 120 (47), 196 (25), 160 (20), (9) 227 (17), 224 (16), 112 (15), 118 (14), 113 (13). N.NjN'-Trimethyl-o.p'-DDM 0.37 0.30 120 (100), 240 (M+, 8 6 ), 118 (81), 121 (59), 91 (56), (1 0 ) 132 (45), 133 (34), 106 (21), 134 (21), 194 (21). NjN'.N'-Trimethyl-Ojp'-DDM 0 0.70 0.57 240 (M+, 100), 121 (94), 225 (57), 120 (45), 118 (44), (1 1 ) 134 (32), 91 (31), 180 (24), 119 (23), 112 (21). N.NjN'-Trimethyl-p^'-DDM 1.41 0.92 240 (M+, 100), 239 (75), 120 (33), 134 (31), 195 (21), (1 2 ) 119 (19), 241 (18), 209 (17), 118 (15), 223 (11). N,N,N',N'-Tetramethyl-o,p'-DDM 0.44 0.46 134 (100), 254 (M+, 92), 118 (71), 239 (55), 91 (36), (13) 132 (32), 119 (25), 133 (21), 255 (19), 120 (16). N,N,N',N'-Tetramethyl-p,p'-DDMd 1 . 0 0 1 . 0 0 254 (M+, 100), 253 (71), 210 (25), 134 (24), 255 (19), (14) 126 (17), 237 (15), 118 (14), 127 (12), 165 (7). N.N'-Dimethyl-Ojp'-DDM 1 . 0 0 0.57 226 (M+, 100), 57 (61), 211 (60), 120 (59), 118 (55), (15) 107 (52), 224 (52), 209 (47), 55 (47), 223 (41). a Actual experiment described in the experimental section. b Columns: 2 m by 0.25 mm, copper, Versamide 3% on Chromosorb W (80-100 mesh) and SE 30 1% on Chromo- sorb P (80-100 mesh), respectively at 200 °C and at 180 °C; flow rate 30 ml/min (N 2 ), injector at 300 °C, manifold at 300 °C. Compound 14 was taken as internal standard. c Spectra were recorded via the GC inlet, unless specified otherwise. d MS recorded via direct inlet. 1316 A. G. Giumanini-M. M. Musiani • Amines as Dehalogenating Agents (7), 9 and 14 were prepared according to known N,N,N',N'-tetrainethyl-o,o'-DDM is not present, methods3-5. Partial methylation of 9 with methyl most probably because of steric reasons, and in iodide gave 12. o-(N-Methylamino)benzyl alcohol force of an extrapolation of the rationale explaining (16) was condensed with N,N-dimethylaniline (1) the relative variation of the m/e 134 and 120 peak and N,N-dimethylanilinium bromide (17) to give intensity in the mass spectrum, as could be learnt mainly 11 and some 13: the ratio of these two from the mass spectra of 11 and 12 (quem vide, products was found to depend on the reaction tem Table II): in fact release of steric compression perature. Compound 13 appeared to be produced facilitated the formation of the ion at mje 120 for 10. via N-methylation by 17. The same alcohol 16 with N-methylaniline (5) and N-methylanilinium bromide Discussion (18) gave as the major product 15 with minor The product analysis of the reaction between 1 amounts of 8.