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Cyclopentenone prostaglandins are a subset of prostaglandins (PGs) or prostanoids (see Eicosanoid §§ Classic eicosanoids and Nonclassic eicosanoids) that has 15-deoxy-Δ12,14-prostaglandin J2 (15-d-Δ12,14-PGJ2), Δ12-PGJ2, and PGJ2 as its most prominent members but also including PGA2, PGA1, and, while not classified as such, other PGs. 15-d-Δ12,14-PGJ2, Δ12-PGJ2, and PGJ2 share a common ...
Cyclopentanone is common precursor to fragrances, especially those related to jasmine and jasmone.Examples include 2-pentyl- and 2-heptylcyclopentanone. [4] It is a versatile synthetic intermediate, being a precursor to cyclopentobarbital.
Its isomer, 3-cyclopentenone is less commonly encountered. The term cyclopentenone may also refer to a structural motif wherein the cyclopentenone moiety is a subunit of a larger molecule. Cyclopentenones are found in a large number of natural products , including jasmone , the aflatoxins , and several prostaglandins .
It is one of many products from the pyrolysis of lignocellulose. [4]It is used in flavors and perfumery for its maple- or caramel-like odor. [5] It contributes to the flavor or odor of many foods including wines, coffee, paprika, and salmon.
The key step of the reaction mechanism involves a cationic 4π-electrocyclic ring closure which forms the cyclopentenone product (See Mechanism below). As the reaction has been developed, variants involving substrates other than divinyl ketones and promoters other than Lewis acids have been subsumed under the name Nazarov cyclization provided ...
In the 1960s, the earliest and most strict variant of the diet was termed the "Zen macrobiotic diet" which claimed to cure cancer, epilepsy, gonorrhea, leprosy, syphilis and many other diseases. [18] [7] Ohsawa wrote that dandruff is "the first step toward mental disease". [18] Ohsawa wrote about the diet in his 1965 book Zen Macrobiotics. [7]
In the 1990s, several fruit-flavored varieties of Diet Rite were introduced. In 2000, the line was reformulated yet again, this time to replace aspartame with Splenda brand sucralose and Sunett brand acesulfame potassium. It became the first major diet soda in the United States to use neither aspartame nor saccharin as a sweetener.
The CRON-diet (Calorie Restriction with Optimal Nutrition) [1] is a nutrient-rich, reduced calorie diet developed by Roy Walford, Lisa Walford, and Brian M. Delaney. [2] The CRON-diet involves calorie restriction in the hope that the practice will improve health and retard aging, while still attempting to provide the recommended daily amounts of various nutrients. [3]