Titlebook: Strain and Its Implications in Organic Chemistry; Organic Stress and R Armin Meijere,Siegfried Blechert Book 1989 Kluwer Academic Publisher

墻壁

[2+3] Carbo- and Hetero-Cyclic Annulation in the Design of Complex Molecules.1,omocrotonate to enones, aldehydes, and some imines, or by a [4+1] protocol that utilized the intramolecular cycloadditions of diazoketones or azides to 1,3-dienes. The resulting strained 3-membered rings provided, through their energy contents, the necessary driving force for the corresponding rearr

moribund

有惡臭

colostrum

synovitis

Chemical Behaviour of Cation Radicals Derived from Strained Molecules in Solution. Spiro-Activationilizing groups in a geminal manner, are highly reactive in the thermal reactions with TCNE or DDQ. The reaction with TCNE produces a five-membered . adduct, whereas the product isolated in the reaction of methyl-substituted substrate with DDQ is a Diels-Alder adduct after ring-cleaving dehydrogenati

危險

Limited

Intramolecular [2+2] Cycloadditons of Ketenes and Olefins,bi- and tricyclic cyclobutanones. The major side reaction, namely the dimerization of the ketene is prevented by the introduction of conformational restrictions. This has been achieved by an additional double bond or by an annulated ring system. Following this strategy C-analogues of a penem and a c

Gossamer

The Generation and Rearrangement of 2-Diazocarbonyl Cyclobutanones: The Formation of 5-Spirocyclopr these materials as well as the conjugation extended 5-alkylidene and arylidene derivatives have been reported. In light of this, it is curious that 5-spirocyclopropyl Δ. butenolides are, virtually unknown2 in spite of the fact that they represent a homoconjugated variation of the 5-alkylidene deriv

grieve

Cyclobutane-Cyclopentane Interconversion of Coordinated Adducts of Cycloheptatriene and Tetracyanoea 2:3 ratio. The rate constants for the interconversion process in CDC1. were evaluated by the spin saturation transfer technique, and in CD.OD by variable temperature line shape analysis. The rate constant for the 3+ 2 2+ 2 rearrangement in CDC1. k. 0.19 ±0.03 s. with ΔG 18.37 . 0.10 kcal/mol at 24

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