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Norelgestromin/ethinylestradiol, sold under the brand name Ortho Evra among others, is a contraceptive patch containing the progestin norelgestromin and the estrogen ...
William H. Harris, is an American orthopaedic surgeon, Founder and Director Emeritus of the Massachusetts General Hospital Harris Orthopaedics Laboratory, [1] and creator of the Advances in Arthroplasty course held annually since 1970. [2]
Norgestimate, sold under the brand name Ortho Tri-Cyclen among others, is a progestin medication which is used in birth control pills for women and in menopausal hormone therapy. [ 1 ] [ 3 ] [ 4 ] [ 5 ] The medication is available in combination with an estrogen and is not available alone. [ 6 ]
Triethyl orthoformate is an organic compound with the formula HC(OC 2 H 5) 3.This colorless volatile liquid, the ortho ester of formic acid, is commercially available.The industrial synthesis is from hydrogen cyanide and ethanol.
o-Xylene (ortho-xylene) is an aromatic hydrocarbon with the formula C 6 H 4 (CH 3) 2, with two methyl substituents bonded to adjacent carbon atoms of a benzene ring (the ortho configuration). It is a constitutional isomer of m-xylene and p-xylene, the mixture being called xylene or xylenes. o-Xylene is a colourless slightly oily flammable ...
There are 2 ortho positions, 2 meta positions and 1 para position on benzene when a group is attached to it. When a group is an ortho / para director with ortho and para positions reacting with the same partial rate factor, we would expect twice as much ortho product as para product due to this statistical effect.
Other molecules and functional groups containing two hydrogen atoms, such as water [27] and methylene (CH 2), [28] also have ortho- and para- forms (e.g. orthowater and parawater), but this is of little significance for their thermal properties. [28] Their ortho:para ratios differ from that of dihydrogen.
ortho-Vanillin (2-hydroxy-3-methoxybenzaldehyde) is an organic solid present in the extracts and essential oils of many plants. [1] [2] [3] Its functional groups include aldehyde, ether and phenol. ortho-Vanillin, a compound of the formula C 8 H 8 O 3, is distinctly different from its more prevalent isomer, para-vanillin.