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

Ingredient

acrophobia

Canary

On the Relationship between Strain and Chemical Reactivity of Torsionally Distorted Carbon-Carbon D been obtained. The relationship between strain energy, reaction exothermicity and other spectroscopic parameters to the rate of epoxidation are examined in an effort to identify the chemical manifestations of strain.

無脊椎

優(yōu)雅

Some Synthetic Implications of the Concept of Cyclopropyl Units as Pseudo-Functional Groups,ng strain can provide a thermodynamic driving force. However, as the comparison of cyclopropanes with cyclobutanes (which have similar strain energies) illustrates, release of such strain energy may not be sufficient for high reactivity. The ir character of the ring bonds of a cyclopropane provides

拱墻

Stereoselective Electrocyclizations and Sigmatropic Shifts of Strained Rings: ,!,redictions have been tested experimentally. Outward rotations are favored by donors and inward rotations by powerful acceptors. The electronic effects which cause this stereoselectivity are found to influence the ground-state geometries of cyclobutenes and other substituted small-ring compounds. The

猛烈責(zé)罵

The Preparation and Thermal Rearrangement of Functionalized 6-(1-Alkenyl)Bicyclo[3.1.0]Hex-2-Enes. quadrone (8), the thermolytic rearrangements of a number of substituted 6-(l-alkenyl)bicyclo[3.1.0]hex-2-enes were investigated. Upon thermolysis, compounds 9, 12, 36, 38, 42, 44, and 58 underwent clean [3,3]-sigmatropic (Cope) rearrangement to provide excellent yields of the functionalized bicyclo[

homocysteine

Synthesis with Donor-Acceptor-Substituted Vinylcyclopropanes,s well as simple ring cleavage variants are described. In-situ reaction of the liberated enones with hetero nucleophiles or carbon nucleophiles allows preparation of a variety of functionalized γ-oxocarboxylate derivatives. Of special interest are adducts obtained from nitro alkanes in high yields.

Crayon

Synthesis of Functionalized Episulfides,es of substituted allene episulfides and 1,2,3- butatriene episulfide derivatives are readily obtained in the reactions of diazo compounds with thioketenes, the rearrangement of sulfur ylide formed by an intramolecular carbene reaction, the thionation of methylenecyclopropanones, and the alkenyliden

jet-lag

Through-Bond Interaction Via Cyclobutane Relay Orbitals as a Means of Extending Conjugation,5.3.0.0.]deca-3,5-diene (13) has been synthesized from dimethyl ε-truxillate. Stepwise belting of a preformed all-trans 1,2,3,4-tetrasubstituted cyclobutane with proper differentiation of the 1,3- and 2,4-positions is crucial to successful twofold annulation. The response of these structurally unusu