摘要:

Sodium formate was converted to sodium cyanide in high yields, usually better than 85%, by heating with two molecular proportions of sodium amide at 620 °C. for 12 min. in a stainless steel bomb. A modified synthesis of sodium formate, from the carbon-14 sodium carbonate solution supplied commercially, is described, yield 95–97%.

ISSN:0008-4042    

DOI:10.1139/v52-055

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

2-Bromo-2-nitro-1,3-indandione (I) reacts with pyridine in a complex reaction at ordinary temperature. The main reaction products are 2-nitro-1,3-indandione pyridine salt, pyridine hydrobromide, phthalic acid, and a black tar consisting of oxidized polymer of pyridine hydrobromide. The reaction of (I) with picolines follows the same route.The electronic theory has been applied to demonstrate the structure of 2-nitro-1,3-indandione (II). In water solutions or in salts (II) exists in the form of an anion which is stabilized by several resonating structures.

ISSN:0008-4042    

DOI:10.1139/v52-056

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Trifluoromethyl radicals were produced by the reaction between atomic sodium and iodo-, bromo-, and chloro-trifluoromethane in the diffusion flame apparatus. The results indicate that:(1). The primary reaction is CF3X + Na → NaX + CF3.(2). For the reaction between sodium and iodo-, bromo-, and chloro-trifluoromethane, the activation energy is 1.7, 2.3, and 7.4 kcal. per mole, respectively.(3). Some decomposition of trifluoromethyl radicals occurs, yielding chiefly tetrafluoroethylene.(4). Reaction occurs between molecular hydrogen and trifluoromethyl radicals yielding fluoroform.

ISSN:0008-4042    

DOI:10.1139/v52-057

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

Polystyrene polymerized in emulsion at 55 °C. to near-complete conversion has been subjected to careful primary, secondary, and tertiary fractionation. For representative samples and fractions thereof, the intrinsic viscosity [η] and the slope constants β andk′ have been determined at 25 °C. in butanone and benzene. For intrinsic viscosities in benzene ranging from 2.10 to 8.37, the equation log [η] (in benzene) = 0.31 + 1.23 log [η] (in butanone) holds. In butanone the value ofk′ is 0.40 ± 0.01, changing from 0.39 for the lower fractions ([η] in butanone <2.00) to 0.41 for the highest fractions; in benzene, the better solvent, the corresponding values ofk′ are 0.02 units lower.Samples of cross-linked polystyrene were prepared by copolymerizing styrene with small proportions of divinylbenzene. Values ofk′ determined for the soluble cross-linked species, both unfractionated and fractionated, varied (in butanone) all the way from the normal 0.40 to 1.14, depending on the proportion of divinylbenzene used.It is concluded thatk′ is a sensitive indicator of nonlinearity in polymer molecules, and that in polystyrene as normally prepared in emulsion systems the molecules are essentially linear.

ISSN:0008-4042    

DOI:10.1139/v52-058

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v52-059

出版商:NRC Research Press    

年代:1952

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v52-060

出版商:NRC Research Press    

年代:1952

数据来源: NRC