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Reactions with Cyclic Transitions States

2-Benzisoxazole and alicyclic ketones undergo a mercury sulfate-catalyzed cycloaddition in boiling xylene. The enol tautomers (141) are apparently involved and the yields of [Pg.35]

Although l,2-benzisoxazol-2-ines are known, their chemistry has received little attention to date 81AHC(29)1, p. 29). [Pg.37]

Photolysis in general produced oxazoles and a variety of other products including aminochalcones, nitriles, aldehydes and chalcone oximes. A number of photolytic intermediates have been postulated, represented by (151), (152), (153) and (154) (77CL1195, 75T1373, 73HCA2588, 73TL2283). [Pg.37]

A number of manipulations on isoxazolinone can be performed with the nucleus remaining intact, and a variety of reagents cleave the ring. Isoxazolin-5-ones have also been used as synthons for the production of other heterocycles (76ZC270). [Pg.39]

The treatment of ethyl Af-methyl-5-oxo isoxazoline-4-carboxylate with NaOH generated ethyl Af-methylmonomalonamide. The reaction in the case of 3-unsubstituted derivatives [Pg.40]

The distinction between Diels-Alder reactions and 1,3-dipolar cycloadditions is semantic for the five-membered rings Diels-Alder reaction at the F/B positions in (357) (four atom fragment) is [Pg.418]

An intramolecular [4 + 2] cycloaddition is represented by a thermal conversion of allylphenoxy- and allyloxyphenoxy-pyridazines into xanthenes (80CPB198). [Pg.31]

Pyridazinium and phthalazinium dicyanomethylides give indolizines as primary adducts with 1,2,3-triphenylcyclopropene, either by [4 + 2] cycloaddition or by 1,3-dipolar addition of the ylide to triphenylcyclopropene (81JCS(P1)73). [Pg.31]


REACTIONS WITH CYCLIC TRANSITION STATES 5.02.9.1 Cycloadditions... [Pg.26]

Reactions involving radicals, reducing agents and at surfaces Reactions with cyclic transition states Reactions of substituents Other reactions... [Pg.829]

D. Reactions with Cyclic Transition States 1. Cycloadditions to N-Oxides... [Pg.407]

Reactions with Cyclic Transition States, Formally Involving a Second Species 433... [Pg.403]

E. Reactions with Cyclic Transition states 1. Six-Membered Rings Diels-Alder Reactions... [Pg.48]

Reactions with Cyclic Transition States 3.2.1.10.1 Introduction... [Pg.227]


See other pages where Reactions with Cyclic Transitions States is mentioned: [Pg.30]    [Pg.40]    [Pg.75]    [Pg.167]    [Pg.247]    [Pg.35]    [Pg.4]    [Pg.211]    [Pg.551]    [Pg.560]    [Pg.589]    [Pg.589]    [Pg.599]    [Pg.601]    [Pg.307]    [Pg.316]    [Pg.491]    [Pg.491]    [Pg.514]    [Pg.523]    [Pg.830]    [Pg.851]    [Pg.376]    [Pg.29]    [Pg.46]    [Pg.525]    [Pg.536]    [Pg.1135]    [Pg.1149]    [Pg.17]    [Pg.54]    [Pg.74]    [Pg.1]    [Pg.273]    [Pg.418]    [Pg.491]   


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Cyclic reactions

Cyclic transition state

Transition cyclic

Transition reactions with

Transition states reactions

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