October 31, 1913] 



SCIENCE 



641 



served by Nef, with lactic aldehyde acetate and 

 mandelio aldehyde acetate at 100°. On the other 

 hand, Wohl and Lange, and Kranz have shown 

 that lactic aldehyde is capable of existence at ordi- 

 nary temperature. 

 C. G. Derick and O. Kamm : The Mechanism of the 



Bearrangements of Dihydro-^-N apthoic Acids. 

 Carl 0. Johns and Emil J. Baumann : Researches 

 on Purines xii.: S-Oxy-6-Methyl-9-Ethylpurine; 

 S-Oxy-6, 8-Dimethyl-9-Ethylpurine; S-Oxy-6- 

 Methyl-8-Thio-9-Ethylpurine ; S-Methylmercapto- 

 G-Oxy-8-Thiopurine ; S-Oxy-6-Methyl-9-Ethylpu- 

 rine-S-TMoglycollio Add. 

 Gael 0. Johns and Emil G. Baumann : Researches 

 on Purines xiii.: 2, 8-Dioxy-l, 6-Dimethylpu- 

 rine; S, 6-Dioxy-S, 4-Dimethyl-5-Nitropyrimidine 

 (a-Dimethyl-Nitrouracil) . 

 J. H. Ransom and E. E. Nelson : Acyl Derivatives 

 of o-Aminophenol. 



The work covered by this report is a continua- 

 tion of that of the senior author on the molecular 

 rearrangement of the acyl derivatives of o-amino- 

 phenol.^ The hydrochloride of the isoamyl car- 

 bonate was prepared and identified by its proper- 

 ties. On warming its solution it quicliily changed 

 to the corresponding urethane. Diaeyl derivatives 

 were prepared coupliag the isoamyl carbonate both 

 with the ethyl carbonate and with the benzoyl 

 group, and introducing these groups in reverse 

 order. Identical diacyl derivatives resulted in 

 both cases, without the isolation of any intermedi- 

 ate products. Rearrangement proceeded in the di- 

 rection to leave the carbonate radical attached to 

 the nitrogen, its weight relative to the other acyl 

 exerting no influence on its position. In the case 

 of both acyls being carbonates (isoamyl and ethyl) 

 the lighter of the two is attached to nitrogen. 



W. M. Blanchaed: Viacetyl: A Study in Struc- 

 tural Chemistry. 

 L. V. Redman, A. J. Weith and F. P. Bkock: The 

 Determination of Phenol in the Presence of 

 Formaldehyde and Sexamethylenetetramine. 

 In the regular determination of phenols by 

 bromine or iodine the presence of hexamethylenete- 

 tramine does not interfere. Formaldehyde does 

 interfere with the determination. If a few c.c. 's 

 of strong ammonia be added to the mixture of 

 phenol and formaldehyde and the solution then 

 acidified the formaldehyde is changed to hexa- 

 methylenetetramine and the determination of the 

 phenol may be made accurately. 



2 Am. Chem. Journ., Vol. XXIII., p. 1. 



L. V. Redman, A. J. Weith and F. P. Beock: 



Synthetic Resins Produced hy the Anhydrous 



Reaction between Phenols and Hexamethylene 



Tetramine. 



A historical review is given of the reaction 

 which taies place in a water solution between 

 phenol and active methylene groups. 



A new reaction is presented, the anhydrous re- 

 action between dry phenols and hexamethylenete- 

 tramine in which synthetic resins are formed and 

 NH eliminated as a by-product. 



Resins of variable properties are produced, de- 

 pending upon the proportions of phenol to hexa. 

 Some resins with excess phenol are liquid at all 

 temperatures above 30° C, others are solid at all 

 temperatures to the point of charring. 



The resins are solid or spongy, depending on 

 the rate and degree of heating. 



The last intermediate product formed before 

 the resin becomes insoluble is endeka-saligeno- 

 saligenin with a formula CjHsoOu. 



L. V. Redman, A. J. Weith and F. P. Brock: 



Varnishes and Lacquers Made from Synthetic 



Resins. 



A comparison is made between synthetic resins 

 made from phenol -|- formaldehyde with conden- 

 sing agent and phenol -[- hexamethylenetetramine. 

 The advantage of the latter process is uniformity 

 of product. Both classes are soluble in caustic. 

 The introduction of an inert group anisol, phenetol, 

 etc., to block the free hydroxyl of the phenol, pro- 

 duces resins which satisfactorily resist the action 

 of caustic alkalies and also show an improvement 

 in lightness and permanency of color. The uses 

 of varnishes and lacquers made from the resin are 

 given. 

 L. V. Redman, A. J. Weith and F. P. Brock: 



A New Synthetic Resin. 



This resin is formed by the anhydrous reaction 

 between phenol, four parts, and hexamethylene- 

 tetramine, one part. Article gives description of 

 reaction, uses, physical properties and a compari- 

 son with similar substances. Its properties, which 

 depend upon the treatment given, are: Sp. gr. 1.2- 

 1.3; fusibility 100° C. to infusible; hardness 2.5- 

 4; solubility, soluble to insoluble; toughness, from 

 that of glass to wood; tensile strength, 4,500 

 pounds per square inch; crushing strength, 32,000 

 pounds per square inch; dielectric strength, 80,000 

 volts per mm.; specific electrical resistance 28 X 

 108 megohms per cm.s This resin is easily molda- 

 ble in almost endless variety. 



