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  2. Disiamylborane - Wikipedia

    en.wikipedia.org/wiki/Disiamylborane

    Disiamylborane is prepared by hydroboration of trimethylethylene with diborane. [1] The reaction stops at the secondary borane due to steric hindrance. Disiamylborane is relatively selective for terminal alkynes and alkenes vs internal alkynes and alkenes. Like most hydroboration, the addition proceeds in an anti-Markovnikov manner. [1]

  3. Hydroboration–oxidation reaction - Wikipedia

    en.wikipedia.org/wiki/Hydroboration–oxidation...

    Hydroboration–oxidation is an anti-Markovnikov reaction, with the hydroxyl group attaching to the less-substituted carbon. The reaction thus provides a more stereospecific and complementary regiochemical alternative to other hydration reactions such as acid-catalyzed addition and the oxymercuration–reduction process.

  4. Syn and anti addition - Wikipedia

    en.wikipedia.org/wiki/Syn_and_anti_addition

    In organic chemistry, syn-and anti-addition are different ways in which substituent molecules can be added to an alkene (R 2 C=CR 2) or alkyne (RC≡CR).The concepts of syn and anti addition are used to characterize the different reactions of organic chemistry by reflecting the stereochemistry of the products in a reaction.

  5. Hydroboration - Wikipedia

    en.wikipedia.org/wiki/Hydroboration

    In terms of regiochemistry, hydroboration is typically anti-Markovnikov, i.e. the hydrogen adds to the most substituted carbon of the double bond. That the regiochemistry is reverse of a typical HX addition reflects the polarity of the B δ+-H δ− bonds. Hydroboration proceeds via a four-membered transition state: the hydrogen and the boron ...

  6. This Stat Can Help You Tell If You're Actually Hitting Your ...

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    The “right” method for you depends on your resources and what you plan to do with any data you collect. DEXA scan. A DEXA scan (dual-energy X-ray absorptiometry) is the “gold standard” for ...

  7. Organoboron chemistry - Wikipedia

    en.wikipedia.org/wiki/Organoboron_chemistry

    Among hindered dialkylboranes is disiamylborane, abbreviated Sia 2 BH. It also is a dimer. Owing to its steric bulk, it selectively hydroborates less hindered, usually terminal alkenes in the presence of more substituted alkenes. [12] Disiamylborane must be freshly prepared as its solutions can only be stored at 0 °C for a few hours.

  8. Colorado apartment to close after multiple arrests, claims of ...

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    An Aurora, Colorado judge granted the 'emergency closure' of The Edge at Lowry Apartments after multiple arrests and rumored gang activity.

  9. NFL Star Odell Beckham Jr. Reveals Health Diagnosis - AOL

    www.aol.com/nfl-star-odell-beckham-jr-123000970.html

    Odell Beckham Jr. opened up about his health and a recent diagnosis. The NFL star recently told Prevention he has a chronic skin condition, seborrheic dermatitis. “When I found out millions of ...