Kim, Dong CHan published the artcileSynthesis of new thiazolium betaines and the ring expansion reaction via 1,4-dipolar cycloaddition, Category: catalysis-chemistry, the publication is Journal of Heterocyclic Chemistry (1995), 32(5), 1581-6, database is CAplus.
The 1,4-dipolar cycloaddition of 3-phenyl-7-[N-phenyl(carbamoyl)]-5,6-dihydroimidazo[2,1-b]thiazolium betaine (I) with a series of aliphatic alkylating agents such as Et bromoacetate, ¦Á-chloroacetone, and Et 4-chloroacetoacetate gave a variety of new ring-expanded cycloadducts. E.g., (12RS,13SR)-12-acetyl-2,4-dioxo-1,3,9-triphenyl-6,7-dihydro-12H-thiazino[3′,4′:2,3]imidazo[1,2-a][1,3,5]triazine was prepared in 38% yield from I and ¦Á-chloroacetone.
Journal of Heterocyclic Chemistry published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Category: catalysis-chemistry.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia