Methyl tetra - 0-methyl- ?-D- glucopyranoside is stereoselectively prepared from tetramethyl-D- glucopyranose by using (MeI+NaH) in toluene (86%) or cyclohexane (85%), while its ?- isomer is best synthesized in hexamethyl phosphoramide (64%). Similarly, methyl tetra-o-methyl-?- D-mannopyranoside is synthesized in cyclohexane (80%), while its ?- isomer is predominantly prepared by (MeI+n-Bu...

The title compound, C(36)H(36)Br(2)O(3), was synthesized from (R(p))-4-bromo-12-hy-droxy[2.2]paracyclo-phane and oxydiethane-2,1-diyl bis-(4-methyl-benzene-sulfonate). The crystal packing exhibits a short O⋯Br inter-action [Br⋯O = 3.185 (3) Å] and a weak inter-molecular C-H⋯O contact.

Methyl-coenzyme M reductase (MCR) catalyzes both the synthesis and anaerobic oxidation of methane (AOM). Its catalytic site contains Ni at core cofactor F430. The ion, in its low-valent Ni(I) state, lights fuse leading to homolysis C–S bond methyl-coenzyme (methyl-SCoM) generate a methyl radical, which abstracts hydrogen atom from coenzyme B (HSCoB) mixed disulfide CoMSSCoB. Direct reversal thi...

The title compound, C(20)H(32)N(2)O(2)S(2), has been synthesized by the reaction of α-methyl-sulfanylcyclo-dodeca-none and p-toluene-sulfonyl-hydrazine. In the crystal structure, the conformation of the non-benzenoid ring is [3333] and the methyl-sulfanyl group is in the α-side exo position. The mol-ecules are linked by inter-molecular N-H⋯S hydrogen bonds.

In the title salt, C4H7N4O(+)·C7H7O3S(-), the 2,6-di-amino-4-oxo-1,3-di-hydro-pyrimidin-1-ium cation inter-acts with the sulfonate group of the p-toluene-sulfonate anion via a pair of N-H⋯O hydrogen bonds, forming a hetero-synthon R 2 (2)(8) that mimics the role of a carboxyl-ate. The self-assembled cations form a homo-synthon R 2 (1)(6) motif which is further linked with the sulfonate anion vi...

background: volatile organic compounds (vocs), including carcinogens and toxic compounds, are produced in petrochemical industries. we undertook this study in order to study workers’ respiratory exposure to different voc concentrations and compare the results with the urinary levels of its metabolites and study the correlation between them in petrochemical industries. materials and methods: exp...