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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.
Catalyzed hydroboration-oxidation of substituted alkenes can be rendered enantioselective. In 1990, Brown and co-workers achieved asymmetric hydroboration using an achiral catalyst and chiral borane sources derived from ephedrine and pseudoephedrine. In most cases, the regioselectivity was poor although the ee values can be close to 90%. [16]
Methylcyclopentane was first synthesized in 1888 by Paul Caspar Freer [Wikidata] and W. H. Perkin Jr. by a Wurtz reaction of sodium and 1,5-dibromohexane. [8] They named it methylpentamethylene since the modern nomenclature wasn't developed until 1892 Geneva Rules.
Lentigo in cats is a common dermatological condition characterized by the presence of small, flat, brownish spots on the skin — particularly around the lips, nose, and eyelid margins. Unlike in ...
The condition of a cat's skin and coat can also be an important indicator of its general health. Skin disorders of cats vary from acute, self-limiting problems to chronic or long-lasting problems requiring life-time treatment. Cat skin disorders may be grouped into categories according to the causes.
Below, we’ve listed the different types of cat litter available, along with their benefits and drawbacks: Clumping Clay Litter. This is one of the most common types of cat litter that you will find.
Cyclopentene was first prepared by Carl Gärtner in 1893 from iodocyclopentane with potassium hydroxide.He named it pentamethenylene (German: Pentamethenylen). [3] ...
Around 9–12 months, or when the cat reaches maturity. Duration: The syndrome will remain present for the cat's entire life, but episodes only last for one to two minutes. Treatment: Behavioural adaptation, pharmaceuticals and alternative medicine. Prognosis: Good, provided the cat doesn't self-mutilate excessively.