Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Cyclobutanes ring formation

Baldwin JE (1991) Thermal Cyclobutane Ring Formation. In Trost BM (ed) Comprehensive Organic Synthesis. Pergamon Press, Oxford, chap 2.1... [Pg.1199]

Ultraviolet light irradiation of A-acylindoles in the presence of alkenes gives cyclobutane ring formation. In intermolecular examples the major pathway involves bond formation of the indole... [Pg.95]

In addition, Tsuda and Oikawa carried out molecular orbital calculations of the electronic structures in the excited states of poly(vinyl cinnamate) [131, 132], They based their calculations on the reaction of intermolecular concerted cycloaddition that take place according to the Woodward-Hoffmann s rule. This means that the cyclobutane ring formation takes place if a nodal plane exists at the central double bond in the lowest unoccupied MO(LLUMO) and not in the highest occupied MO (HOMO) of the grotmd state cinnamoyloxy group. This is within the picture of Huckel MO or Extended Huckel MO theory. The conclusion is that the cmicerted cycloadditions occur favorably in the lowest triplet state Ti and in the second excited singlet state S2 [132]. [Pg.741]

See other pages where Cyclobutanes ring formation is mentioned: [Pg.117]    [Pg.16]    [Pg.63]    [Pg.65]    [Pg.67]    [Pg.69]    [Pg.71]    [Pg.73]    [Pg.75]    [Pg.77]    [Pg.79]    [Pg.81]    [Pg.83]    [Pg.21]    [Pg.144]    [Pg.16]    [Pg.185]    [Pg.63]    [Pg.65]    [Pg.67]    [Pg.69]    [Pg.71]    [Pg.73]    [Pg.75]    [Pg.77]    [Pg.79]    [Pg.81]    [Pg.83]    [Pg.16]    [Pg.27]    [Pg.995]    [Pg.183]    [Pg.152]    [Pg.123]    [Pg.145]    [Pg.204]   


SEARCH



Cyclobutanation

Cyclobutane

Cyclobutane rings

Cyclobutanes

Cyclobutanes, photochemical ring-formation

Ring formation

© 2024 chempedia.info