Yur’ev, Yu. K. published the artcileCatalytic transformations of heterocyclic compounds. LIII. Transformations of homologs of oxazole into homologs of thiazole, Recommanded Product: 4,5-Dimethyloxazole, the publication is Zhurnal Obshchei Khimii (1958), 7-11, database is CAplus.
cf. C.A. 46, 8086a; 51, 2720d. Passage of 9 g. 2,5-dimethyloxazole (b. 115-17°, n21D 1.4394, d21 0.9856) over Al2O3 in H2S stream at 350° gave 13% unchanged material and 13% 2,5-dimethylthiazole, b760 151-3°, 1.4898, 1.0280 (picrate, m. 172°). At 300° the yield is 13%, at 375° it is 12%. At 375° 4,5-dimethyloxazole (b755 115-17°, n20D 1.4432, d20 0.9966) passed over Al2O3 in H2S stream gave 15.5% 4,5-dimethylthiazole, b47 75-7°, 1.5193, 1.0699 (picrate, m. 187°). Similarly at 375° 2,4-dimethyloxazole (b750 106-8°, 1.4389, 0.9757) gave 12% 2,4-dimethylthiazole, b50 67-8°, 1.5095, 1.0513 (picrate, m. 137-8°), while 2,4,5-trimethyloxazole (b760 137-8°, 1.4425, 0.9569) gave similarly 10% 2,4,5-trimethylthiazole, b20 64-6°, 1.5023, 1.0327 (picrate, m. 132°). The results indicate that the oxazole ring is more stable to attack by H2S than is furan.
Zhurnal Obshchei Khimii published new progress about 20662-83-3. 20662-83-3 belongs to oxazolidine, auxiliary class Oxazole, name is 4,5-Dimethyloxazole, and the molecular formula is C18H28N2O7, Recommanded Product: 4,5-Dimethyloxazole.
Referemce:
https://en.wikipedia.org/wiki/Oxazolidine,
Oxazolidine | C3H7NO – PubChem