14660-20-9

Upstream product

• 21119-13-1 thioacetic acid O-methyl ester 
• 67-64-1 acetone 
• 123-54-6 acetylacetone 
• 598-31-2 1-bromoacetone 
• 10387-40-3 potassium thioacetate 
• 926-67-0 O-Ethyl thioacetate 

Downstream Products

• 78429-69-3 4-methylsulfanyl-pent-3-en-2-one 
• 24653-75-6 1-mercaptopropan-2-one 

Relevant academic research and scientific papers

Synthesis of 5-Membered Sulfur Heterocycles via Tin-Catalyzed Annulation of Mercapto Ketones with Activated Alkenes

Efficient conversion of α-mercapto ketones 1 with activated alkenes 2 into S-heterocycles was developed with Sn(Oct)2-2MeOH acting as a catalyst. Two types of products, dihydrothiophene 3 and thiolane 4, were obtained. The selectivity of the products was dependent on the reaction temperature and on the rearrangement of the S-heterocycles from 3 to 4 under heating conditions. The dihydrothiophenes 3 were transformed into useful thiolactones 6-8 and thiophene 9.

Characterisation and mechanistic study of the oxidative addition reactions of [Ir(cod)(sacac)]

[Ir(cod)(sacac)] (sacac = thioacetyl acetonato) complexes were successfully synthesized and characterised using 1H and 13C NMR, IR and micro elemental analyses. The formation of isosbestic points in different solvents clearly indicate the formation of only one product, while the kinetic results for all of the complexes (except for chlorobenzene) showed simple second order kinetics with a zero intercept (within experimental error). The rate of oxidative addition showed little or no change with a solvent variation even with a large difference in polarity for the selected solvents, varying between 1.78 × 10-3 and 5.2(3) M-1 s-1 for chlorobenzene and acetonitrile respectively. Activation volumes were determined in four of the solvents, which varied between +10.2(9) for chloroform to -18(1) cm3 mol-1 for acetonitrile. This solvent variation obeyed the Kirkwood equation with an intrinsic volume of activation of -21(3) cm3. A DFT analysis of the oxidative addition reaction shows that the trans addition is energetically favoured and that the trans [Ir(cod) (sacac) (CH3) (I)]-alkyl product is more stable than the four possible cis [Ir(cod) (sacac) (CH3) (I)]-alkyl products.