4278-43-7 Usage
Uses
A sol-gel process has been developed for the chemical synthesis of ZnS at room temperature using zinc tert-butoxide and H 2 S as precursors in a toluene solution. The key step that enables this zinc-mediated epoxidation to be catalytic may be the equilibrium between zinc peroxide (R)-15 and zinc tert-butoxide (R)-16 in the presence of t-BuOOH. An additional important feature that renders the dual catalytic cycles feasible is the poor reactivity of zinc tert-butoxide toward the iridium-bound cationic intermediate, whereby the requisite deprotonation process is effectively mediated by zinc tert-butoxide.
Check Digit Verification of cas no
The CAS Registry Mumber 4278-43-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,2,7 and 8 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 4278-43:
(6*4)+(5*2)+(4*7)+(3*8)+(2*4)+(1*3)=97
97 % 10 = 7
So 4278-43-7 is a valid CAS Registry Number.
4278-43-7Relevant articles and documents
A Zinc Catalyzed C(sp3)?C(sp2) Suzuki–Miyaura Cross-Coupling Reaction Mediated by Aryl-Zincates
Procter, Richard J.,Dunsford, Jay J.,Rushworth, Philip J.,Hulcoop, David G.,Layfield, Richard A.,Ingleson, Michael J.
supporting information, p. 15889 - 15893 (2017/10/24)
The Suzuki–Miyaura (SM) reaction is one of the most important methods for C?C bond formation in chemical synthesis. In this communication, we show for the first time that the low toxicity, inexpensive element zinc is able to catalyze SM reactions. The cross-coupling of benzyl bromides with aryl borates is catalyzed by ZnBr2, in a process that is free from added ligand, and is compatible with a range of functionalized benzyl bromides and arylboronic acid pinacol esters. Initial mechanistic investigations indicate that the selective in situ formation of triaryl zincates is crucial to promote selective cross-coupling reactivity, which is facilitated by employing an arylborate of optimal nucleophilicity.
