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The Sharpless catalog is a list of 313 H II regions (emission nebulae) intended to be comprehensive north of declination −27°.(It does include some nebulae south of that declination as well.)
Simeis 147, also known as the Spaghetti Nebula, SNR G180.0-01.7 or Sharpless 2-240, is a supernova remnant (SNR) in the Milky Way, straddling the border between the constellations Auriga and Taurus. It was discovered in 1952 at the Crimean Astrophysical Observatory by Grigory Shajn and his team using a Schmidt camera and a narrowband filter ...
The Sharpless epoxidation is viable with a large range of primary and secondary alkenic alcohols. Furthermore, with the exception noted above, a given dialkyl tartrate will preferentially add to the same face independent of the substitution on the alkene.To demonstrate the synthetic utility of the Sharpless epoxidation, the Sharpless group created synthetic intermediates of various natural ...
Sh 2-155 is an ionized H II region with ongoing star formation activity, [1] at an estimated distance of 725 parsecs (2400 light-years) from Earth. [ 2 ] [ 3 ] Sh 2-155 [ 4 ] was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue , [ 5 ] being a part of the much larger Cep OB3 Association ...
If freezing yolks, mix every four eggs with 1/8 teaspoon or 1/2 teaspoon sugar to prevent the yolks from thickening. Lightly beat the eggs, whites, or yolks, then put them in a freezer-safe ...
Sh 2-88A is an HII-type diffuse nebula excited by the type O8 star BD+25°3952. [4] Both neutral and ionized gases in Sh 2-88 are between 150 and 410 solar masses and the dust mass is about 2 to 9 solar masses. The structure been interacting with a HI interstellar bubble shaped by the stellar winds of BD+25°3952 and the blue O8.5II(f) star BD ...
Nucleophilic epoxidation is the formation of epoxides from electron-deficient double bonds through the action of nucleophilic oxidants. Nucleophilic epoxidation methods represent a viable alternative to electrophilic methods, many of which do not epoxidize electron-poor double bonds efficiently.
Karl Barry Sharpless (born April 28, 1941) is an American stereochemist.He is a two-time Nobel laureate in Chemistry known for his work on stereoselective reactions and click chemistry.