Expanding the scope of the Newman–Kwart rearrangement — A computational assessment

2006 ◽  
Vol 84 (11) ◽  
pp. 1567-1574 ◽  
Author(s):  
Heiko Jacobsen ◽  
James P Donahue

The Newman–Kwart rearrangement (NKR) has been studied for a variety of thioncarbamates using density functional (B3LYP) and ab initio (MP2) methodologies. The results confirm and support the generally accepted mechanism that the NKR proceeds through a four-membered cyclic transition state. The presence of a π system connected via an oxygen linkage to a thiocarbonyl functionality is identified as a crucial structural element for the NKR. The calculations further suggest that the NKR might also be feasible for thioncarbamates derived from π system containing groups other than phenols such as ethenol, ethenediol, and butadienol. The NKR is compared with the Schönberg rearrangements of thioncarbonates.Key words: density functional calculations, localized orbital locator, oxygen–sulfur transposition, thiols.

2018 ◽  
Vol 130 (46) ◽  
pp. 15301-15305 ◽  
Author(s):  
Maoping Pu ◽  
Italo A. Sanhueza ◽  
Erdem Senol ◽  
Franziska Schoenebeck

2008 ◽  
Vol 07 (02) ◽  
pp. 277-286 ◽  
Author(s):  
ABEDIEN ZABARDASTI ◽  
SAEID AMANI ◽  
MARYAM SALEHNASSAJ ◽  
ALI H. KIANFARD

Ab initio and density functional calculations are used to analyze the interaction between a molecule of fulminic acid with one, two, three, and four molecules of ammonia along with a 2:2 complex at B3LYP/6-311++G(d, p) and MP2/6-311++G(d, p) computational levels. Cooperative effect (CE) in terms of stabilization energy of clusters is calculated and discussed as well. For the studied clusters, the CE is increased with increasing cluster size. Red shifts of H – C stretching frequency for complexes involving HCNO as H -donor are predicted. Atom in molecules is used to analyze the cooperative effect on topological parameters.


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