A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1121-22-8, Name is trans-Cyclohexane-1,2-diamine, molecular formula is C6H14N2. In an article, author is Kuenzler, Sandra,once mentioned of 1121-22-8, Recommanded Product: trans-Cyclohexane-1,2-diamine.
Cyclic silylated chalconium borates 13[B(C6F5)(4)] and 14[B(C6F5)(4)] with peri-acenaphthyl and peri-naphthyl skeletons were synthesized from unsymmetrically substituted silanes 3, 4, 6, 7, 9 and 10 using the standard Corey protocol (Chalcogen Ch=O, S, Se, Te). The configuration at the chalcogen atom is trigonal pyramidal for Ch=S, Se, Te, leading to the formation of cis- and trans-isomers in the case of phenylmethylsilyl cations. With the bulkier tert-butyl group at silicon, the configuration at the chalcogen atoms is predetermined to give almost exclusively the trans-configurated cyclic silylchalconium ions. The barriers for the inversion of the configuration at the sulfur atoms of sulfonium ions 13 c and 14 a are substantial (72-74 kJ mol(-1)) as shown by variable temperature NMR spectroscopy. The neighboring group effect of the thiophenyl substituent is sufficiently strong to preserve chiral information at the silicon atom at low temperatures.
Interested yet? Keep reading other articles of 1121-22-8, you can contact me at any time and look forward to more communication. Recommanded Product: trans-Cyclohexane-1,2-diamine.
Reference:
Chiral Catalysts,
,Chiral catalysts – SlideShare