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- W308072192 abstract "ABS>Progress is reported on the synthesis of new pyrazine derivatives for evaluation as gas turbine lubricants. The preparation of a variety of pyrazine containing intermediates and their subsequent conversion to further modified derivatives is described. Some physical properties of these materials are discussed. Various classes of 2-substituted3-methylpyrazines in which the substituents are phenoxy, mercapto, anilino, and silyl radicals were extended to include new members of each class. Studies on the phenylation and acylation of these intermediates at the methyl site were continued, and examination of the intermediates oxidation at this position was initiated. Reactions were conducted using model compounds to determine the feasibility of preparing pyrazine derivatives with new types of linkages. An attempt to prepare diSTA2-(3- methylpyrazyl)! ether gave the isomeric compound N-STA2- (3-methylpyrazyl)!- 3methyl-2-pyrazone instead. Methylpyrazine was converted to phenoxybenzylpyrazine by a benzynel type reaction. The previously prepared alpha , alpha -difluorophenacylpyrazine was converted to 1-phenyl-2- pyrazyltetrafluoroethane with the aid of sulfur tetrafluoride. An ultraviolet spectral study of 2-anilino-3-methylpyrazines and related reference compounds suggests that these intermediates tend to exist in the intact pyrazine structure rather than the tautomeric amidine form. The observed general good thermal stability of these matenials supports the conclusions from the U.V. study. Themore » thermal stability screening of 2-substituted-3methylpyrazines and other pyrazine derivatives was continued. Previously observed trends seem to be reinforced by the more recent data. Two compounds displayed noteworthy stability, viz., 2-(p- nonylphenoxy)-3-methylpyrazine and 2- (p-dodecylphenoxy)-3-methylpyrazine gave no detectable viscosity change after being subjected to the test (500 deg F for 9 hours). Some 2-mercapto-3-methylpyrazines were found to be very unstable. A difference in the mode of thermal decomposition of the alkyl- and the arylmercaptopyrazines was established. Some preliminary attempts are made to correlate the physical properties of the various pyrazine derivatives with their structures. (For preceding period see NP-8514.) (J.R.D.)« less" @default.
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- W308072192 date "1960-06-01" @default.
- W308072192 modified "2023-09-27" @default.
- W308072192 title "THE SYNTHESIS AND EVALUATION OF NEW BASE STOCK FLUIDS FOR GAS TURBINE APPLICATION. Quarterly Progress Report No. 3 Covering Period March 1, 1960 to May 31, 1960" @default.
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