Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999) called Enthalpies of vaporization of β-diketones, Author is Irving, Roger J.; Ribeiro da Silva, Manuel A. V., which mentions a compound: 18362-64-6, SMILESS is CC(C)C(CC(C(C)C)=O)=O, Molecular C9H16O2, Safety of 2,6-Dimethyl-3,5-heptanedione.
The enthalpies of vaporization (ΔHv0) of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione [1522-22-1], 1,1,1-trifluoro-2,4-pentanedione [367-57-7], and 4 Me2CRCOCH2COCMeR1R2 (R, R1, R2 = H, Me), e.g. 2,2,6,6-tetramethyl-3,5-heptanedione [1118-71-4], were determined by calorimetry. A graph of ΔHv0 against b.p. for the 7 diketones and (MeCO)2CH2 wasa smooth weakly convex curve. The increments of ΔHv0 by CH2 groups were close to those in aliphatic ketones.
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Reference:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica