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  2. Buchner ring expansion - Wikipedia

    en.wikipedia.org/wiki/Buchner_ring_expansion

    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.

  3. Metal-catalyzed cyclopropanations - Wikipedia

    en.wikipedia.org/wiki/Metal-catalyzed_cyclopropa...

    Definitive mechanistic studies of rhodium-catalyzed cyclopropanation are lacking. However, the mechanism has been rationalized based on product distribution and stereoselectivity. [4] Attack of the diazo compound on the metal center generates a zwitterionic metal alkyl complex, which expels nitrogen gas to afford a metal carbene intermediate.

  4. Cyclopropanation - Wikipedia

    en.wikipedia.org/wiki/Cyclopropanation

    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.

  5. Chronic multifocal Langerhans cell histiocytosis - Wikipedia

    en.wikipedia.org/wiki/Chronic_multifocal_Langer...

    The prognosis is poor if liver, spleen, lung, or bone marrow is affected. [7] A good response to chemotherapy within the first six weeks of treatment, has been found to indicate a better prognosis. In some people the condition is life-threatening. [7] Hence, follow-up is long-term. [7]

  6. Transient erythroblastopenia of childhood - Wikipedia

    en.wikipedia.org/wiki/Transient_erythroblastopen...

    Individuals with TEC have a median age of presentation of 18–26 months; however, the disorder may occur in infants younger than 6 months and in children as old as age 10 years. Because of the gradual onset of the anemia, children are often healthier than expected from their low hemoglobin levels.

  7. Co-defendant of Young Thug stabbed in jail while awaiting ...

    www.aol.com/co-defendant-young-thug-stabbed...

    One of two remaining co-defendants in Georgia's longest-running criminal trial was stabbed in jail, his lawyer said Monday morning, as jurors resumed deliberations in the sprawling racketeering ...

  8. Billy Bob Thornton Says Sixth Wife Connie 'Drug Me Out of the ...

    www.aol.com/billy-bob-thornton-says-sixth...

    Billy Bob Thornton credits wife Connie Angland for lifting him up when he needed someone most.. The actor, who currently stars on the new series Landman, appeared on The Drew Barrymore Show for ...

  9. Methylenation - Wikipedia

    en.wikipedia.org/wiki/Methylenation

    In the case of arenes, the cyclopropanation product undergoes further electrocyclic ring opening to give cycloheptatriene products (Buchner ring expansion). [2] Alkenes undergo both C=C methylenation and C–H methylenation insertion to give a mixture of cyclopropanation and homologation products.