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Your search keyword '"Massimo Maccagno"' showing total 53 results
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53 results on '"Massimo Maccagno"'

51. Crystal structure of (1E,3E)-4-methylthio-2-nitro-3-phenylsulfonyl-1- pyrrolidino-1,3-butadiene, C15H18N2C 4S2

Author

Cinzia Tavani, P Fossa, Giovanni Petrillo, Massimo Maccagno, Angelo Mugnoli, and Lara Bianchi

Subjects
Inorganic Chemistry, chemistry.chemical_compound, Crystallography, QD901-999, Chemistry, Nitro, Organic chemistry, Molecule, 1,3-Butadiene, General Materials Science, Crystal structure, Condensed Matter Physics, Sulfone
Abstract

C15H18N2O4S2, monoclinic, P121/c1 (No. 14), a = 8.754(3) Å, b = 12.499(2) Å, c = 15.599(3) Å, β = 95.09(2)°, V = 1700.1Å3, Z = 4, Rgt(F) = 0.049, wRref(F2) = 0.128, T = 294 K.

52. Ring-Opening/Ring-Closing Protocols from Nitrothiophenes: Six-Membered versus Unusual Eight-Membered Sulfur Heterocycles through Michael-Type Addition on Nitrobutadienes

Author

Fernando Sancassan, Marco Stenta, Domenico Spinelli, Massimo Maccagno, Lara Bianchi, Giovanni Petrillo, Cinzia Tavani, Gianluca Giorgi, and Elda Severi

Subjects
Thiopyran, fused-ring systems, medium-ring compounds, nitrothiophenes, ring expansion, sulfur heterocycles, Stereochemistry, Organic Chemistry, chemistry.chemical_element, nitrothiophenes, medium-ring compounds, General Chemistry, Ring (chemistry), Sulfur, Catalysis, sulfur heterocycles, fused-ring systems, chemistry.chemical_compound, chemistry, ring expansion, Moiety
Abstract

When Ar is a low-aromaticity homo- or heterosystem, the sulfonyl-stabilized anion of nitrobutadienes 4 (which derive from the initial ring opening of 3-nitrothiophene) undergoes a rather surprising addition onto the aromatic ring itself, thereby leading to the construction of an unusual eight-membered sulfur heterocycle condensed with the original Ar ring. The competitiveness of such a pathway with respect to the formation of the thiopyran ring (i.e., addition onto the nitrovinyl moiety) is favored at low temperatures, thus revealing its nature as a kinetically controlled process.

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