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Spiro cyclohexadiene

Chemical Name (+-)-[Hydroxy-6-methoxy-5-methyl-llH-cyclopenta[i,j]-isoquinoline]-7-spiro-l -(2,5-cyclohexadiene-4-one)... [Pg.1769]

Cycloheptan-benzo-dioxolE14a/l, 64 (Umacetalisier.) 1,3-Cyclohexadien l-(2-Butenoyl)-5-oxo-2,6,6-trimethyl- IV/la,... [Pg.1156]

Spiro[2.5]octadienyl radical (146), the radical analog of the phenonium ion (105), is a very short-lived species but was detected by its visible absorption and fluorescence on generation by radical abstraction from 147 prior to facile ring-opening to 148 (equation 29). There appeared to be a modest (two-fold) acceleration compared to 1,3- or 1,4-cyclohexadiene in the rate of abstraction from 147, and this was attributed to stabilization by a favorable interaction between cyclopropyl and the adjacent semioccupied orbital in 146. Kinetic acceleration was also proposed to occur in hydrogen atom abstraction from spiro[2.n]alkanes (149). ... [Pg.612]

Hart, D. J., Kim, A., Krishnamurthy, R., Merriman, G. H., Waltos, A. M. Synthesis of 6H-dibenzo[b,d]pyran-6-ones via dienone-phenol rearrangements of spiro[2,5-cyclohexadiene-1,1 (3 H)-isobenzofuran]-3 -ones. Tetrahedron 1992,48, 8179-8188. [Pg.577]

Oxo-1,5-di-tert.-butyl - cyclohexadien - (1,4) - (3-spiro-l)-cis- 2,3 -dime -thyl-cyelopropan isomerisiert sich durch einen intramolekularen Energie-Transfer vom Dienon-System iiber einen Dreiring zum 6-Oxo-l,5-di-tert.-butyl-cyclohexadien-(l,4)-(3-spiro-l) - trans -2,3- dimethyl-cyclopropan 2 ... [Pg.187]

In NaOH/NaBHj entsteht bei Belichtung naoh 3 Stdn. u. a. 6-Hydroxy-cyclohexadien-(l,4)-(3-spiro-l)-3-oxo-2-athyl-2,3-dihydro-lH-isoindol (29%) und 4-Hydroxy-N-dthyl-N-benzoyl-anilin. [Pg.646]

The endoperoxide of 1,4-diaryl-1,3-cyclopentadiene (293) reacts in precisely the same way with pivalaldehyde and cyclopentanone affording the cis and trans t-butyltrioxanes (294), and the spiro-cyclic derivative (156) (Equation (42)) <95HCA647>. In all cases, x-ray reveals that the newly formed trioxane ring is c -fused to the original ring. 1,3-Cyclohexadiene peroxides also react with aldehydes and ketones to give cw-fused bicyclic trioxanes. [Pg.893]

Chemical Name ( )-[Hydroxv-6-methoxv-5-methvl-11 H-cyclopentaCij]-isoquinolinel -7-spiro-1 (2 -cyclohexadiene-4-one)... [Pg.727]

See other pages where Spiro cyclohexadiene is mentioned: [Pg.269]    [Pg.269]    [Pg.459]    [Pg.199]    [Pg.151]    [Pg.306]    [Pg.798]    [Pg.212]    [Pg.517]    [Pg.1066]    [Pg.541]    [Pg.374]    [Pg.3323]    [Pg.27]    [Pg.798]    [Pg.1050]    [Pg.13]    [Pg.340]    [Pg.1066]    [Pg.798]    [Pg.798]    [Pg.812]    [Pg.865]    [Pg.870]    [Pg.871]    [Pg.871]    [Pg.871]    [Pg.1066]    [Pg.871]    [Pg.1160]    [Pg.199]    [Pg.3322]    [Pg.63]    [Pg.63]    [Pg.117]    [Pg.382]    [Pg.25]   


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Spiro cyclohexadiene synthesis

Spiro cyclohexadiene via arene-metal complexes

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