Reactive methylene groups. II. Stilbene formation in solvents

✍ Scribed by Hargreaves, K. R. ;McGookin, A.

• Book ID: 102889662
• Publisher: Wiley (John Wiley & Sons)
• Year: 1950
• Weight: 613 KB
• Volume: 69
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000690606

✦ Synopsis

Application of the methods for a complete analysis of Three synthetic mixtures were made up. (A) and (B) were identical cxcept that in (A) before adding the ammonia, sufficient formaldehyde was added to convert 90% of the monoand dimethylamines into their formaldehyde. condensation products.

Table VII shows the results obtained, the figures being in moles per cent. synthetic mixtures Tablc VII Mixture (A) AIixture (B) Mixture (C) Present Found Present Found Present Found NH. _ . .. 11.1 11.7 11.1 11.8 2.8 2 . 8 hlcNHI and or (McNCH2)3 39.3 39.4 39.3 38.0 2.4 2 . 1 Mc,NH and/or (McLN).CH2 42.4 42.6 42.4 40.3 63.6 62.3 Mc,N .. .. 7.2 6.1 7.2 6.8 31.1 31.2 CH,O. moles Total 100.0 99.8 100.0 96.9 99.9 98.7 equivalent of aminc .. n.d. n.d. n.d. n.d. 0.155 0.14~

Getteral notes (I) Titrations with all the bases except trimethyltrimethylenetriamine give good end-points. With the latter, it is essential to work in very dilute solution.and to approach the end-point from the acid side. (a) 60% of the nitrogen estimated in the ammonia test. (b) goy, of the potential formalin estimated in the formalde-(2) Hexamine has the following reactions in the tests : hyde test.

Acknowledgements

We wish to thank Imperial Chemical Industries Ltd., Billingham Division, for communicating to us their methods for the determination of ammonia and monomethylamine, and Robinson Brothers Ltd., for permission to publish.