4784-86-5

Usage

Physical state

Colorless liquid

Odor

Strong, unpleasant

Usage

Building block in the synthesis of various organic compounds
Pharmaceutical synthesis
Agrochemical synthesis

Industrial applications

Production of polymers and resins

Flammability

Highly flammable

Safety precautions

Handle with care to prevent potential safety hazards

Protective measures

Use proper protective measures when working with this chemical

Reactivity

High reactivity

Health risks

Potential health risks due to exposure or improper handling

InChI:InChI=1/C7H10/c1-6-4-3-5-7(6)2/h3-4H,5H2,1-2H3

Upstream product

• 109-99-9 tetrahydrofuran 
• 67-56-1 methanol 
• 1455-13-6 deuteromethanol 
• 40410-75-1 1,1-dibromo-2-isopropenyl-2-methylcyclopropane 
• 917-54-4 methyllithium 
• 147962-93-4 3,4-Dimethyl-cyclopent-2-enol 
• 30434-64-1 3,4-dimethylcyclopent-2-en-1-one 
• 542-92-7 cyclopenta-1,3-diene 
• 74-88-4 methyl iodide 
• 91313-90-5 1,1-dibromo-2-methyl-3-propenyl-cyclopropane 

Downstream Products

• 15596-37-9 4,5-dimethyl-2-phenyl-3a,4,7,7a-tetrahydro-4,7-methano-isoindole-1,3-dione 

Relevant academic research and scientific papers

Process for preparing cyclopentadienyl group-containing silicon compound or cyclopentadienyl group-containing germanium compound

Disclosed is a process for preparing a cyclopentadienyl group-containing silicon compound or a cyclopentadienyl group-containing germanium compound, comprising reacting (i) a lithium, sodium or potassium salt of a cyclopentadiene derivative with (ii) a silicon halide compound or a germanium halide compound in the presence of a cyanide or a thiocyanate. The cyanide or the thiocyanate is preferably a copper salt. According to the process of the invention, a cyclopentadienyl group-containing silicon compound or a cyclopentadienyl group-containing germanium compound, which is very useful for the preparation of a metallocene complex catalyst component, can be prepared in a high yield for a short period of time.

Futher Evidence for the Vinyl Cyclopropylidene-Cyclopentenylidene Rearrangement

Reactions of two intermediate vinylcyclopropylidenes, generated from the corresponding nitrosoureas by two different routes, have been studied.For one of them, a carbene-carbene rearangement was the main reaction mode while for the other, ring opening to the allene occured exclusively.On the other hand, dienyl ethers were the only products from ring-opening of the corresponding cyclopropane diazonium ions formed in methanol under acid conditions.The results of the former reactions relate well to those obtained from treatment of the corresponding gem-dibromocyclopropanes with methyllithium.

1-Oxoalkyl-2-isopropylnorbornane derivatives, uses thereof in augmenting or enhancing the aroma of consumable materials and processes for preparing same

Described are 1-oxoalkyl-2-isopropylnorbornane derivatives defined according to the generic structure: STR1 wherein X represents a moiety selected from the group consisting of: STR2 wherein the dashed line represents a carbon-carbon double bond or a carbon-carbon single bond and wherein R1 and R2 represent hydrogen or methyl with the proviso that R1 and R2 are not both methyl, and uses thereof in augmenting or enhancing the aroma of consumable materials selected from the group consisting of perfume compositions, colognes and perfumed articles. Also described are processes for preparing said 1-oxoalkyl-2-isopropylnorbornane derivatives by means of a low temperature catalytic Diels Alder reaction or high temperature thermal Diels Alder reaction between a bicyclopentadiene derivative and 2-methyl-3- buten-5-one according to the reaction: STR3 wherein R represents methyl or hydrogen.

Chemistry of gem-Dihalocyclopropanes. XX. The Effect of Methyl and Phenyl Substituents on the Vinylcyclopropylidene-Cyclopentenylidene Rearrangement

Reactions of gem-dibromocyclopropanes of the general structure 1 with methyllithium have been studied.In the most cases cyclopentadienes and/or vinylallenes are the products formed.The results obtained give evidence of a profound substituent effect on the carbene-carbene rearrangement leading to cyclopentadienes.We believe the effect is essentially steric in origin.The results support the mechanism proposed for the rearrangement.

An Electron Spin Resonance Study of the Methylcyclopentadienyl Radicals, MenH5-nC5 (n=1-5)

The radicals MenC5H5-n have been generated by photolysis of the corresponding hydrocarbons (n=3-5) or mercury derivatives (n=0-5) and their e.s.r. spectra have been recorded.The spectra are interpreted in terms of thermal population of the ψA and ψS molecular orbitals, for which the predicted hyperfine coupling constants are calculated by the McLachlan equation, taking λ 0.75 and Q(C5H5) -30 and Q(Me5C5) 31.85 G.The energy separations between the ψA and ψS MOs can be rationalised on the assumption that a methyl substituent on a carbon atom of the cyclopentadienyl carrying a unit ?-electron has a destablising interaction, within a factor of two, of 10 kJ mol-1.