Search results
Results from the WOW.Com Content Network
The Buchner ring expansion is a two-step organic C-C bond forming reaction used to access 7-membered rings. The first step involves formation of a carbene from ethyl diazoacetate , which cyclopropanates an aromatic ring.
Cyclopropanation is also stereospecific as the addition of carbene and carbenoids to alkenes is a form of a cheletropic reaction, with the addition taking place in a syn manner. For example, dibromocarbene and cis -2-butene yield cis -2,3-dimethyl-1,1-dibromocyclopropane, whereas the trans isomer exclusively yields the trans cyclopropane.
A chemotherapy regimen is a regimen for chemotherapy, defining the drugs to be used, their dosage, the frequency and duration of treatments, and other considerations.In modern oncology, many regimens combine several chemotherapy drugs in combination chemotherapy.
To change this template's initial visibility, the |state= parameter may be used: {{Preparations for treatment of wounds and ulcers | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{Preparations for treatment of wounds and ulcers | state = expanded}} will show the template expanded, i.e. fully visible.
Cyclopropane is the cycloalkane with the molecular formula (CH 2) 3, consisting of three methylene groups (CH 2) linked to each other to form a triangular ring.The small size of the ring creates substantial ring strain in the structure.
Josh Mankiewicz says he doesn’t flinch anymore watching himself on TV after dropping 70-lbs.. The Dateline correspondent, 69, opened up to PEOPLE about his impressive weight loss journey for the ...
The College Football Playoff releases the fifth top 25 rankings of the season on Tuesday. Here’s what to know and how to watch.
The vinylcyclopropane rearrangement or vinylcyclopropane-cyclopentene rearrangement is a ring expansion reaction, converting a vinyl-substituted cyclopropane ring into a cyclopentene ring.