692-48-8Relevant articles and documents
Different Reactivity Modes of Cis and Trans Di-tert-butylthiiranium Tetrafluoroborates with Water. A New Insight in the Electrophilic Additions to Z and E Di-tert-butylethylenes
Lucchini, Vittorio,Modena, Giorgio,Pasi, Manuela,Pasquato, Lucia
, p. 7018 - 7020 (1997)
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Bach,Richter
, p. 3442 (1973)
A spontaneous fragmentation: From the Criegee zwitterion to coarctate Mobius aromaticity
Berger, Christian,Bresler, Christian,Dilger, Ulrich,Geuenich, Daniel,Herges, Rainer,Roettele, Herbert,Schroeder, Gerhard
, p. 1850 - 1853 (2007/10/03)
The extremely fast fragmentation of the spiroozonides prepared from formaldehyde O-oxide and three-membered ring ketones proceeds via the coarctate transition state 1. The ozonides decompose at temperatures as low as -90°C to form carbon dioxide, alkene/alkyne, and formaldehyde (the topology of the structure of 1 is depicted on the right). The mechanism is in accordance with the rules for the stereochemical course of coarctate reactions.
Heterodiene cycloadditoins of C2 symmetric 4,5-disubstituted ketene acetals: the nett asymmetric conjugate addition of recyclable acetic ester enolate equivalents to an activated enone
Wallace, Timothy W.,Wardell, Ian,Li, Ke-Dong,Leeming, Peter,Redhouse, Alan D.,Challand, S. Richard
, p. 2293 - 2308 (2007/10/02)
Heterodiene cycloadditions of 3-formylchromone 2 to a series of ketene acetals 1 derived from C2 symmetric 1,2-diarylethane-1,2-diols are diastereoselective.From (S,S)-1,2-di(o-tolyl)ethane-1,2-diol 6c the major cycloadduct 3c was isolated by crystallization and transformed by acid-catalysed methanolysis into (S)-methyl 4-oxo-3,4-dihydro-2H-1-benzopyran-2-ylacetate 5, together with the original 1,2-diol 6c which could be recycled.The structures of two cyclic carbonates 22a and 22c were determined by X-ray diffraction and used as models in seeking a mechanistic rationale for the stereoselective cycloadditions of the analogous ketene acetals 1a and 1c.